Access Linux Server of Arduino YUN with Putty
In today's post we are gonna see how to connect Arduino YUN with Putty and access the files on Linux OS in Arduino YUN. In my last post Getting Started With Arduino YUN, I have explained in detail about basics of Arduino YUN. I am recall few important things here. Arduino YUN is a very powerful board with two processors on it. One is Arduino microcontroller used to control the output / input pins. The other processor is named as Atheros and it has Linus operating system on it, so one can easily run python scripts on it and can do any server or client side coding in it.
So, today we are gonna see ow to access this Linux operating system of Arduino YUN using Putty software in Windows. Putty is a third party software used for accessing serial terminal, perform telnet or SSH communication etc. So using this software we can easily access the Linux OS on Arduino YUN. So let's have a look how we are gonna do this.
Access Linux Server of Arduino YUN with Putty
- First of all, download the putty software. Its a free software and you can download it quite easily using google.
- After downloading the software, open it and you will have a screen similar to below image:
- Now first of all select the SSH, which is shown in above figure by # 2, then give the IP address of your arduino YUN and Port will remain 22. If you don't know how to get the IP address of Arduino YUN then read Getting Started With Arduino YUN.
- After adding this information, click on the Open button and for the first time, it will show a window similar to below image, simply click on YES.
- This above Window will appear only when you are using putty for the first time, it won't appear afterwards.
- After clicking YES, the below Window will open up asking for Login as:
- When it asks for login, give log in as "root" and the default password is "arduino".
Note:
- If you have changed the password in first tutorial Getting Started With Arduino YUN, then give that password now.
- When you will be typing the password, nothing will appear on putty that's common so you just simply type the password and hit ENTER.
- Now once you entered the password, it will get connected and you will get the below window.
- Now you are in the root folder of your Arduino YUN Linux operating system, now its just like a command prompt or Linux Command Line.
- Let's write some commands and test it out. Check out the below image:
- In the above figure, you can see the first command sent is "cd .." to go into previous folder.
- After that I send the command "cd mnt/sda1" to access the sd card, its the default folder for sd card.
- Next command I sent is "ls", it will show all the files or folder present in the sd card. Currently I have just one folder in my sd card named as Shell.
- After that I updated the opkg package by giving command "opkg update".
- As I am connected with internet on my Arduino YUN sield, so its automatically downloaded and updated and finally I got "Signature check passed".
- Next I installed a new package named as nano. In order to install it I used the command "opkg install nano". Nano is kind of notepad in Linux.
- Now we are gonna write a python script, so I typed "nano TEP.py", and after entering this command the below window will open up.
- In this window, you can write your python script and press Cntrl+X to Exit and it will ask for the save. Hit Y to save and N to No, and when you press Y then it will be saved.
- Let's check it out whether its saved or not, and in order to do so we have to again send the same command "ls" and it will give us the folders and files as shown below:
- You can see now we have TEP.py as well along with Shell folder.
- So, today we have seen how to connect Arduino YUN with putty and access the Linux side of YUN. Afterwards we tested few commands and also check how to write a python code in YUN.
That's all for today, in the coming post of Arduino YUN I will show you how to connect Arduino YUN automatically with Wifi using python scripts. Till then take care and have fun. :)
Interfacing of Seven Segment with Arduino in Proteus
Hello friends, today we are gonna have a look on how to interface Seven Segment with Arduino in Proteus. In my last post, I have posted an Arduino Library for Seven Segment Display, which is designed by our team and is quite basic in functionality. So, if you haven't checked that post then first of all check that one and download the Arduino Library for Seven Segment Display as I am gonna use that library in today's post. Moreover, in order to run this library you are also gonna need to download Arduino Library for Proteus, using this library you will be able to use Arduino board in Proteus so also read that post and download this library and install it in your Proteus.
Again I am mentioning that its the first library designed by our team so its in basic stages, it has few functions and will only display the numeric on the seven segment display which is normally required. I am planning on adding more examples in the library for future use, which will increase the functionality. Anyways that's a future talk, let's start today's post.
What is Seven Segment Display?
Let's first have a look at what is Seven Segment Display. Seven Segment display is nothing but an electronic device used for displaying the numeric data. It's a complex form of LED matrix and is normally used in clocks, LCD displays, calculators etc where there's a need to display the numeric data. It has total seven leds in it which you can also count from above image and by turning these LEDs ON or OFF we can display any numeric on it. For example, have a look at the below image. In this image I have shown numeric 0 on seven segment. Now in order to do so, I just simply turn OFF the centered LED and turn ON all the corner LEDs and it becomes 0.
How does Seven Segment Work?
Now, let's have look at how it works. So, we have seen that Seven Segment is named seven segment because it has total seven LEDs on it so now what we need to do is to control these seven LEDs, also named as segments, and then we can display any character on it. There are two types of seven segments available in the market and named as:
- Common Cathode
- Common Anode
They both work exactly the same and has only a slight difference. They both has total seven pins and each pin is used to control each led and they have an extra pin which is named as Common Pin. In Common Cathode you have to GND this Common Pin, while in common Anode, you have to give +5V to this Common Pin. Have a look at this below image, we have labelled leds with respect to the pins.
Interfacing of Seven Segment with Arduino in Proteus
- Now we know all about Seven Segment Display and know how it works so let's interface Seven Segment with Arduino in Proteus.
- Now, I am assuming that you have installed the Arduino Library for Proteus and have also installed the Arduino Library for Seven Segment display.
- So, now open your Arduino Software and go to File>Examples>SevenSegment>Counting.
- Open this example, in this example I have added a counter which will start counting from 0 to 9 and once it reached 9 then it will start counting again.
- If you can't find this example then you must be making some mistake in installing the library, anyways the code is shown below.
Note:
- In order to run this example you will need two libraries, the inks are given below to download:
/*
Counting
This Arduino example is for Seven Segent display.
It will start the counter from 0 and will end up at 9
and will start again from 0.
This example code is in the public domain.
Created by Syed Zain Nasir at 14 March 2015.
You can get the explanation and latest version of this library at:
http://www.TheEngineeringProjects.com/
*/
#include "SevenSegment.h"
SevenSegment tep = SevenSegment(0,1,2,3,4,5,6);
char arr [10] = {'0','1','2','3','4','5','6','7','8','9'};
int index;
void setup(){
index = 0;
}
void loop(){
tep.display(arr[index++]);
delay(1000);
if(index == 11)
index = 0;
}
- Now open you Proteus Software and design the circuit in it as shown in below figure, I have also attached the file for download at the end.
- Now compile the code and gt the hex file and upload it in your Arduino Properties.
- Now Run the Proteus software, and you will see the seven segment display will start counting, a glimpse of it is shown in the below figure:
- Below is attached the Proteus file and the hex file for the counting example which you simply start and run but again I suggest that you should design it by yourself so that you get something out of it.
Download Proteus Simulation of Seven Segment with Arduino
- One last thing, any kind of contribution to this library from the readers is highly appreciated, design your projects and share codes with us and we will post them on our blog for other readers to get knowledge as knowledge is all about sharing.
That's all for today, hope it will help you in some way. Take care and have fun. :)
Arduino Library for Seven Segment Display
In today's post, I am gonna share a new Arduino Library for Seven Segment Display. In my recent project, I got a chance to work on seven segment displays, I have worked on them using PIC microcontroller but haven't got a chance to use them with Arduino. So, now as usual when I started working on them, I started searching for Arduino Library but I kind of got disappointed after getting quite heavy libraries for seven segments, and after a lot of search I thought of designing my own Arduino library for seven segment display, which I am gonna share in this post. :)
It's not very advanced library as we know seven segment displays are not too complex, so its quite simple and using it you can quite easily display any numerical digit on the seven segment display. Moreover, I have also included an example with the library which will start the counter from zero on seven segment display and keep on incrementing till 9 and after that it will start again from zero. Moreover, I have also posted the example about Interfacing of Seven Segment Display with Arduino in Proteus using this library, it will help you in better understanding of How this library works. You can download the working Proteus Simulation as well as hex file from that post.
Download Arduino Library for Seven Segment Display
- As I stated earlier, its a very simple Arduino Library for Seven Segment Display and it will only print the numeric on seven segment display, but I will work on it in future and will update it by adding more features in it.
- So, first of all click the below button to download the Arduino library for seven segment display.
Download Arduino Library for Seven Segment Display
- After downloading the library, place it in the libraries folder of your Arduino software.
- Now close your Arduino software and open it again.
- Go to File and then Examples and you will find SevenSegment in it and it will have an example which is named as Counting.
Functions in Arduino Library for Seven Segment Display
- I have added quite few function in it which are very basic and are very easy to use.
- The first function I have used is:
SevenSegment(int a,int b,int c,int d,int e,int f,int g);
- In this function, you need to give the pins of Arduino with which you are attaching your seven segment display. It will called as shown below:
SevenSegment tep = SevenSegment(0,1,2,3,4,5,6);
- Now tep is our seven segment object and we are gonna use it in rest of the example.
- The next function used in this arduino library for seven segment display is:
display(char c);
- This function will display the numeric on seven segment display which you will provide it.
- Moreover, it will automatically clear the screen before displaying any new character on the seven segment.
- It is called in the example as shown below:
tep.display('1');
That's all for today, in this next post you can download the example of how to
Interface Seven Segment Display Using Arduino in Proteus, it will help you in understanding of this library in detail.
Temperature Sensor 18B20 with Arduino
Hello everyone, in today's post we are gonna have a look at how to interface temperature sensor Dallas 18B20 with Arduino. There are many temperature sensors available in market like LM35, DHT11 etc but personally I like Dallas18B20 most of all, as it gives the most accurate result up to four decimal points. It operates on single wire and sends all data through this wire. Another advantage of this wire is you can interface multiple sensors with a single data line. You should also have a look at How to use 18B20 in Proteus ISIS.
In today's post, we are gonna get value from this sensor and then print it over the Serial Terminal as well as LCD. We will get the values in degree centigrade. Its not much difficult to interface 18B20 with arduino and also an Arduino library is also availble, using which you can quite easily interface 18B20 with Arduino. Let's get started with interfacing of 18B20 with Arduino.
Note:
Interfacing of Temperature Sensor 18B20 with Arduino
- As I explained earlier, it works on single wire and hence we are gonna need 1-wire library for Arduino along with 18B20 arduino library.
- Download both of these libraries by clicking on the below buttons:
Download One Wire Library Download Dallas Temperature Library
- After downloading the library, place it in the libraries folder of your Arduino Software.
- Now restart your Arduino software and you will find the Arduino folder in the Examples section.
- Next we need to interface our sensor 18B20 with Arduino so design your circuit as shown in below figure:
- So, connect the sensor 18B20 with Arduino as shown in the above figure, connections are quite simple and are as follows:
- Pin # 1 of 18B20 with GND
- Pin # 2 of 18B20 with Pin # 2 of Arduino.
- Pin # 3 of 18B20 with GND of Arduino.
- Add a pull up resistor of 4.7k ohm at pin # 2 of 18B20.
- Here's the images of hardware, we designed for this project, its a 20 x 4 lcd we have used:
- Below image shows the small 18B20 sensor, used in this project, it looks small but very efficient.
- Here's the image showing the complete project:
- Now, copy below code and upload it in your Arduino board and open your serial terminal.
#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal.h>
#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
LiquidCrystal lcd(12, 11, 7, 6, 5, 4);
void setup(void)
{
Serial.begin(9600);
Serial.println("Welcome to TEP !!!");
Serial.println("www.TheEngineeringProjects.com");
Serial.println();
sensors.begin();
lcd.begin(20, 4);
lcd.setCursor(5,0);
lcd.print("Welcome to:");
lcd.setCursor(1,2);
lcd.print("www.TheEngineering");
lcd.setCursor(4,3);
lcd.print("Projects.com");
delay(5000);
}
void loop(void)
{
sensors.requestTemperatures();
Serial.print("Temperature : ");
Serial.println(sensors.getTempCByIndex(0));
//lcd.clear();
lcd.setCursor(0,0);
lcd.print("Temperature: ");
lcd.print(sensors.getTempCByIndex(0));
lcd.print("C");
delay(1000);
}
- After uploading the code, when I start the project, it started showing the temperature values as shown below:
- As you can see, its giving the temperature of my room which is 23.56 degree centigrade.
- I have also designed a video for more demonstration which is given below:
- It's quite a simple code and is self explanatory but still if you need help ask in comments and I will help you out.
Interfacing of Multiple Ultrasonic Sensor With Arduino
Hello friends, hope you are having fun and enjoying life. Today, I am gonna post about interfacing of multiple Ultrasonic sensor with Arduino. In the previous post, we have seen Interfacing of Ultrasonic Sensor With Arduino and in this post I have interfaced single ultrasonic sensor but in projects especially related to robotics, we have to interface multiple ultrasonic sensors. For example you have an obstacle detection robot, now in order to detect obstacle in front of robot you have to place once sensor on the front side but now you can't detect any object present on left or right side of your robot, so you have to place two sensors one on the left side of robot and one on the right side so in this project you need to use total three ultrasonic sensors, one on the front, one on left and one on right side of robot. Similarly, in another project I have to move the robot in a maze having walls on the side of robots, and my task was to move the robot straight within these walls without hitting the walls. In that case, I also used two ultrasonic sensors on both sides of robot and then applied PID algorithm in order to avoid hitting the walls. So, in short its a common practice to use multiple ultrasonic sensor with Arduino and today we are gonna have a look at how to do it.
I have posted about the basics of Ultrasonic sensor and how it works in my previous post so I am not gonna go into that detail. If you haven't read it then I recommend that you should first read Interfacing of Ultrasonic sensor with Arduino. Now, let's get started with Interfacing of multiple ultrasonic sensor with arduino, which isn't that difficult. :)
Note:
- Other Proteus Libraries are as follows:
- I have also posted more examples on Ultrasonic Sensor Simulation in Proteus, have a look at them and you will get complete understanding of this sensor.
- Moreover, for hardware implementation of Ultrasonic Sensor with Arduino, check below posts:
Interfacing of Multiple Ultrasonic Sensor With Arduino
- Let me first summarize the working of ultrasonic sensor again. With ultrasonic sensor, what we need to do is to generate a trigger signal on its trigger pin for around 10 microsecond.
- As soon as the ultrasonic sensor gets this trigger signal, it sends out an ultrasonic signal.
- This ultrasonic signal then hits something and bounced back.
- Now, in order to check this bouncing signal, we have to read the Echo pin and check for how long it remains HIGH, and on the basis of this duration we calculate our distance with the object.
- This is the process for single ultrasonic sensor and when we are using multiple ultrasonic sensors, what we need to do is simply repeat the whole procedure for all the sensors one by one.
- First of all, we will generate the trigger pulse for first sensor and the read its echo pin and get the distance, then we generate the trigger pulse for second sensor and read its echo pin and so on for the third.
- So, here I am gonna use three ultrasonic sensor and the circuit diagram is shown below:
- I have tried my best while designing this image to make it simple but as there are too much wires so it has become a little complex.
- I am pointing out the pin configuration here so it will be easy for you to interface your sensors with arduino. The pin configuration is as follows:
- Vcc of all sensors will go into +5V of Arduino.
- GND of all sensors will go into GND of Arduino.
- Trig Pin of first sensor into Pin # 3 of Arduino.
- Echho Pin of first sensor into Pin # 2 of Arduino.
- Trig Pin of second sensor into Pin # 4 of Arduino.
- Echo pin of second sensor into Pin # 5 of Arduino.
- Trig Pin of third sensor into Pin # 7 of Arduino.
- Echo pin of third sensor into Pin # 8 of Arduino.
- After connecting the pins as discussed above, now copy the below code and upload it in your arduino board.
- After uploading the code in your arduino, open the Serial Terminal of Arduino software and you will start receiving the distances for all the three sensors.
#define trigPin1 3
#define echoPin1 2
#define trigPin2 4
#define echoPin2 5
#define trigPin3 7
#define echoPin3 8
long duration, distance, RightSensor,BackSensor,FrontSensor,LeftSensor;
void setup()
{
Serial.begin (9600);
pinMode(trigPin1, OUTPUT);
pinMode(echoPin1, INPUT);
pinMode(trigPin2, OUTPUT);
pinMode(echoPin2, INPUT);
pinMode(trigPin3, OUTPUT);
pinMode(echoPin3, INPUT);
}
void loop() {
SonarSensor(trigPin1, echoPin1);
RightSensor = distance;
SonarSensor(trigPin2, echoPin2);
LeftSensor = distance;
SonarSensor(trigPin3, echoPin3);
FrontSensor = distance;
Serial.print(LeftSensor);
Serial.print(" - ");
Serial.print(FrontSensor);
Serial.print(" - ");
Serial.println(RightSensor);
}
void SonarSensor(int trigPin,int echoPin)
{
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;
}
- The code is quite similar to the one we used while interfacing single ultrasonic sensor with arduino, the only thing we changed here is the repetition.
- Before, we were using the same function SonarSensor() but calling it only once for our single sensor interfaced with arduino but now we are calling it three times for all the three sensors.
- Its kind of a generic code, you can interface more sensors with it if you want and what you need to do is only calling this function for the next interfaced sensor.
That's all for today, I think we have posted a lot on the ultrasonic sensor so I am not gonna post any more tutorial on this sensor and now I will start writing on some other sensor. You should also have a look at
Arduino Projects for Beginners. Thanks for reading and share it with your friends and help us grow. :)
Interfacing of Ultrasonic Sensor With Arduino
Today, we are gonna have a look on How to Interface Ultrasonic Sensor with Arduino. Few days ago, I have posted a complete tutorial on How to Use Ultrasonic Sensor Library in Proteus and later I have posted different examples on How to Simulate Ultrasonic Sensor in Proteus. Those posts were about Proteus Simulations and weren't about hardware interfacing, so I thought today let's interface it in hardware.
Simulation is a good starting point for projects but they are really far away from real world. It happened to me a lot of times that my simulations are working perfectly fine but when I design the same circuit in hardware then it says no I am not gonna work. :) So, the bottom line is never trust simulations, unless you properly test it on hardware. So, today I am gonna interface an Ultrasonic sensor with arduino and will check its output on the Arduino Serial Terminal.
1. Introduction to Ultrasonic Sensor
- "Ultrasonic Sensor HC-SR04 is a simple sensor which emits Ultrasonic Radiations from its transmitter and is used for measuring the distance between sensor itself and any obstacle in front of it. The sensor has a transmitter and a receiver on it."
- This sensor consists of four pins, which are:
- Vcc (+5V) : You need to provide +5V at this Ultrasonic Sensor HC-SR04 Pin.
- Trig (Trigger) : It's a trigger Pin where we need to provide a trigger after which this sensor emits ultrasonic waves.
- Echo : When Ultrasonic waves emitted y the transmitter, hit some object then they are bounced back and are received by the receiver and at that moment this echo Pin goes HIGH.
- GND : We need to provide ground to this PIN of HC-SR04 Ultrasonic Sensor.
Note:
- If you haven't bought your components yet for this project, then you can buy them from these reliable sources:
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- Trigger pin is an output pin while the Echo pin is an input pin, we will discuss them in Working section in detail.
- Moreover, it requires +5V to start operating.
- It is normally used to detect objects in front of it or to measure the distance between different objects.
2. Working of Ultrasonic Sensor
- Its working is quite simple, as discussed above, it has a trigger and an echo pin.
- A signal of +5V is sent over to Trigger pin for around 10 microseconds in order to trigger the sensor.
- When ultrasonic sensor gets a trigger signal on its trigger pin then it emits an ultrasonic signal from the transmitter.
- This ultrasonic senor, then goes out and reflected back after hitting some object in front.
- This reflected ultrasonic signal is then captured by the receiver of ultrasonic sensor.
- As the sensor gets this reflected signal, it automatically make the Echo pin high.
- The time for which the Echo pin will remain HIGH, depends on the reflected signal.
- What we need to do is, we need to read this time for which the echo pin is high, which we are gonna do in our next section.
- So, let's have a look at Ultrasonic Sensor Arduino Interfacing.
3. Interfacing of Ultrasonic Sensor With Arduino
- Now we have seen the working of Ultrasonic sensor, so we have some idea what we need to do in order to get the values from it. Let's now have a look at Ultrasonic Sensor Arduino Interfacing.
- First of all, we need to generate a signal of 10 microsecond and then send it over to trigger pin.
- After sending the trigger pin we then need to read the echo pin and wait for it to get HIGH.
- Once it got HIGH then we need to count the time for how long it remained HIGH.
- On the basis of this time, we are gonna calculate the distance of the object from the ultrasonic sensor.
- So, first of all, interface your ultrasonic sensor with arduino as shown in below figure:
- Now, use the below code and upload it your arduino board. After uploading the code, open your serial terminal of Arduino software and you will start receiving the values.
#define trigPin1 8
#define echoPin1 7
long duration, distance, UltraSensor;
void setup()
{
Serial.begin (9600);
pinMode(trigPin1, OUTPUT);
pinMode(echoPin1, INPUT);
}
void loop() {
SonarSensor(trigPin1, echoPin1);
UltraSensor = distance;
Serial.println(UltraSensor);
}
void SonarSensor(int trigPin,int echoPin)
{
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;
delay(100);
}
- Now if you check in the SonarSensor() function, we are generating a pulse of 10 microsecond and sending it to trigPin, which is the trigger pin of our ultrasonic sensor.
- After sending this pulse weare using a funcion pulseIn() , its a builtin arduinofunction and is used to check for how long the echoPin remains HIGH.
- This value is further saved in the duration value and after that we have divided this duration by 2 because the pulse is first sent and then received so in actual it covers double distance, so we need to divide it by 2 in order to get distance between object and the sensor.
- Furthermore, it is again divided by 29.1, which is basically the speed of ultrasonic sound and finally we saved it in a variable named distance which is now in centimeters.
- After uploading the sketch in Arduino, you need to open the Serial Terminal and you will start receiving the values of distance.
That's all for today. I hope you have enjoyed this Interfacing of Ultrasonic Sensor with Arduino. It wasn't that difficult, in our coming post we are gonna
Interface Multiple ultrasonic sensors with Arduino and will get their values on the serial terminal. Till then Take care and have fun !!! :)
Receive SMS with AT Commands using Sim900 and Arduino
Update: I have updated the code and removed the bug. Thanks for informing. Now this code will work perfectly.
Buy This Project
Hello friends, hope you all are fine and having good health. Today, as the name suggests, I am gonna post on how to Receive SMS with AT Commands using Sim900 and Arduino. I have already posted a tutorial on How to Send SMS with Arduino UNO and Sim900, so now we are gonna check the opposite. Sending SMS is quite easy, you just need to write some AT commands and write the message you wanna send and hit the Cntrl + Z and it will be sent. But receiving a text message on your SIM900 shield is a bit difficult because now you need to place a check when user will send a message. So, ideally whenever anyone send a message to your SIM900 module, you should get notified. Today, we are gonna cover this how to receive SMS with AT Commands in detail.
Now, after you get notified, there's a need to read the message as well and also who has sent this message. So, we are also gonna cover it today. So, first of all we will place a check that whenever someone sends a message to our SIM900 module, we get notified and after that we will extract the message and the mobile number of sender. We have designed this code after a lot of effort that's why this code isn't free but we haven't placed a very small amount of $20 so that engineering students can also buy it easily. We can also interface our GSM board with other microcontrollers like PIC Microcontroller as well as 8051 Microcontroller. I have also posted tutorial on How to Receive SMS with SIM900 & PIC Microcontroller and How to Send SMS with PIC Microcontroller so if you are working on PIC Microcontroller then you must give it a look. So, let's get started with How to receive SMS with AT Commands using SIM900 and Arduino.
You must also check GSM Library for Proteus, using this library you can easily simulate your GSM module in Proteus ISIS. Moreover, also have a look at Send SMS with Sim900D in Proteus ISIS in which I have designed a simulation of sms sending in Proteus ISIS.
Receive SMS with AT Commands using Sim900 and Arduino
- There are many GSM modules available in the market so it doesn't matter which one you are using unless its having SIM900 module in it.
- I have explained in my previous post that all GSM modules work on AT commands, so here first of all we are gonna have a look on AT commands we are gonna use for receiving the SMS.
- ATE0 - IT is used to turn off the Echo of GSM shield.
- AT - Just to check that your GSM module is working fine.
- AT + CMGF = 1 - This command will convert the message style to text. In other words we are telling our shield that we are expecting a text message.
- AT+CNMI=1,2,0,0,0 - This command will alert our GSM shield and now whenever it will receive message, it will automatically send an alert on the serial port.
- We are gonna use these four commands in our code and we will be able to receive text message on the GSM shield.
- Remember we have to put Enter after each of the above AT commands in order to execute it.
- Below is the first phase of the code and as you can see in this code we are simply sending these four commands serially from arduino to GSM shield.
- These are two functions I have shown below, the first function is Config() which is simply sending the commands via serially and then the Response() function which is called after every AT command and is receiving the response of that AT command.
- So, here's the partial code for How to Receive SMS with AT Commands using Sim900 and Arduino.
void Config()
{
delay(1000);
Serial.print("ATE0r");
Response();
Serial.print("ATr");
Response();
Serial.print("AT+CMGF=1r");
Response();
Serial.print("AT+CNMI=1,2,0,0,0r");
Response();
}
void Response()
{
int count = 0;
Serial.println();
while(1)
{
if(Serial.available())
{
char data =Serial.read();
if(data == 'K'){Serial.println("OK");break;}
if(data == 'R'){Serial.println("GSM Not Working");break;}
}
count++;
delay(10);
if(count == 1000){Serial.println("GSM not Found");break;}
}
}
- The response of these commands is shown below on the Serial Monitor of Arduino.
- For each AT command, we get a response "OK" from the GSM shield.
- Now, I know that I have sent all these four AT commands and my GSM shield is ready to receive the text messages and will inform me.
- So, when you send a message to your GSM shield, it will give a notification as shown in the below figure:
- Each message received by SIM900 module is start with "+CMT" and after that it has the mobile number of the sender and at the end lies the body of the message, which in our message is "www.TheEngineeringProjects.com"
- So now let's extract this mobile number and the text body from this CMT string.
Getting the SMS Text & Sender Mobile Number
- Till now we have learnt How to Receive SMS with AT Commands using Sim900 and Arduino and send you notification over the serial monitor.
- Now we have to place some checks in our code so that we could be able to get the required data out of this string.
- In order to do so, I am gonna first save this CMT string into an array, which I named as RcvdMsg[index].
- But before saving the data into this string, first I need to make sure that I am actually getting the requried string, that's aso possible that I am receving some garbage values.
- So, I placed a check first, which is checking for these four characters "+CMT", and when I got these character on my serial terminal I got sure that I have the string ready so I made the index = 0 and starting receving the string.
- Next thing I need to do is make sure that I have got the complete string, that was really a tricky part as there's no end character in the string.
- So, I used "n" null character for that. If you check the string then you can see that we are getting two null characters in complete string.
- I placed this check that when I get 2 null characters means I have got the complete string so I stopped receving the string.
- After that I simply count the charaters, in my string the sender mobile number is at posting 4 to 16 so I made a loop and save it in another array. and similarly did for the message text.
- Now when I send message after uploading this final code into my Arduino board, I get the below result on my Serial Monitor.
- Isn't it cool :) So, now we have separated the complete text as well as the sender's mobile number from our GSM string and we can use it anywhere we want.
- We can use this mobile number in the previous post code and can reply some text back and can also give a missed call to the user, anything we want. I am gonna post on How to send a call using SIM900 in the next post.
- You can buy the codefor How to Receive SMS with AT Commands using Sim900 and Arduino from our shop by clicking the below button:
Buy This Project
- I have highlighted all the functions in the code.
- As I always say, understand it first and then write on your own and do mistakes so that you learn.
That's all for today. I hope you have enjoyed this project named Receive SMS with AT Commands using Sim900 and Arduino. I will meet you guys in the next post. Till then have fun !!! :)
Ultrasonic Sensor Simulation in Proteus
Hello friends, a few days ago I posted an Ultrasonic Sensor Library for Proteus, using which one can easily simulate ultrasonic sensor in Proteus. The post was highly praised by the reader and I have received quite good feedback from the followers. So, I thought of sharing some more examples related to it so that users can get a complete understanding of how to use Ultrasonic sensors in Proteus. Today, we are gonna have a look on different Ultrasonic Sensor Simulation in Proteus. If you haven't read the previous post then first have a look at it because without the installation of Ultrasonic Sensor Library in Proteus, you won't be able to use these examples. Ultrasonic Sensor is used widely in Embedded Systems.
Today, I am gonna share three examples of Ultrasonic Sensor Simulation in Proteus, which will be enough for you guys to get the overview of this sensor. I have also attached these simulations below and you can easily download them but as I normally advise, it's better to design these simulations by yourself and write your own code as it will help you understand it more clearly. If you don't make mistakes, you won't learn from it. I am gonna share below three examples of Ultrasonic Sensor:
Note:
- Other Proteus Libraries are as follows:
- I have also posted more examples on Ultrasonic Sensor Simulation in Proteus, have a look at them and you will get complete understanding of this sensor.
- Moreover, for hardware implementation of Ultrasonic Sensor with Arduino, check below posts:
Ultrasonic Sensor Simulations in Proteus using Button
- In this tutorial, we are gonna use three buttons and using these buttons we will control our ultrasonic sensor.
- Think of these buttons as three obstacles, which are placed at different distances, if we hit the first button then first obstacle is reached, if we hit second then second obstacle and same as for third.
- So, open your Proteus ISIS and if you have already installed ultrasonic library for Proteus then design your Ultrasonic Sensor Simulation in Proteus as shown in below figure:
- Now open your Arduino software and paste below code in it and get your hex file to upload in this simulation.
Note:
const int pingPin = 7; const int echoPin = 6; void setup() { Serial.begin(9600); } void loop() { long duration, inches, cm; pinMode(pingPin, OUTPUT); digitalWrite(pingPin, LOW); delayMicroseconds(2); digitalWrite(pingPin, HIGH); delayMicroseconds(10); digitalWrite(pingPin, LOW); pinMode(echoPin, INPUT); duration = pulseIn(echoPin, HIGH); inches = microsecondsToInches(duration); cm = microsecondsToCentimeters(duration); Serial.print(inches); Serial.print("in, "); Serial.print(cm); Serial.print("cm"); Serial.println(); delay(100); } long microsecondsToInches(long microseconds) { return microseconds / 74 / 2; } long microsecondsToCentimeters(long microseconds) { return microseconds / 29 / 2; } - After adding the hex file in this simulation, hit the RUN button and if everything goes as expected then you will get a simulation as shown in the below figure:
- You can download this simulation along with Arduino code and the hex file by clicking below button:
Download Ultrasonic Sensor simulation in Proteus Using Button
Ultrasonic Sensor Simulations in Proteus as Proximity Switch
- I have explained the first example in detail so I am not gonna much explain this one.
- In this example, we are using the Ultrasonic Sensor as a Proximity Switch, whenever any obstacle comes in the way of ultrasonic sensor, it will automatically give an indication.
- As you can see from the figure below that we are using a variable voltage source for the analog pin of ultrasonic sensor.
- So, first of all design a simulation as shown in the below figure:
- Now upload the Arduino hex file for this example, which is attached below along with the code and this simulation.
- After uploading the hex file, hit the RUN button and if everything is in your favor, then you will see results similar to below figure:
- As you can see in the above figure, we are sending a Ping from Ultrasonic Sensor and in the programming code we have placed an alarm at a specified distance, so whenever any object comes in that range, our program will give us Alarm, you could also use Buzzer in Proteus.
- You can download this Proteus Simulation along with Arduino Code and hex file by clicking on this below button:
Download Ultrasonic Sensor Simulation in Proteus As Proximity
Ultrasonic Sensor Simulations in Proteus using Switch
- Here's the third and last example of Ultrasonic Sensor simulation in Proteus.
- In this simulation, we are using a switch and controlling the Ultrasonic with that Switch.
- There are total four states for that Switch, which determines what should be the voltage on the analog pin of Ultrasonic Sensor.
- I have also placed a oscilloscope in this simulation which will give you the voltage state for this switch, to get you an idea what's the voltage pattern coming to ultrasonic sensor, its mainly just for understanding and testing.
Note:
- Now upload your Arduino hex file in it and hit the RUN button and you will see something like this:
- As you can see above, the virtual terminal is showing the distances while the oscilloscope is giving us state of switch, play with it and you will learn more and if still confused then ask in comments.
- You can download the Proteus simulation of this example along with Arduino hex file and code by clicking on the below button.
Download Ultrasonic Sensor Simulation in Proteus Using Switch
That's all for today, hope you guys have learn something today, if you have any problem or question, do ask in comments and I will try my best to resolve them. Take care :)
Getting Data From Webserver using Arduino Wifi
In today’s post, as the name suggests, we will see how to get data from online webserver using Arduino Wifi in simple steps. Getting data from web server using Arduino Wifi Shield has always remained a problem for the engineers. Its not much difficult task as its usually considered to be. In today’s post, I will create a small project in which I will control two simple LEDs via online web server. It’s really a very interesting project and when I completed it, I felt like Hurrah!!!
Arduino Wifi Shield is used to connect Arduino board with Wifi. After connectivity with Wifi, one can perform many tasks using this shield. We can built a complete server on it and can also use it as a client. Server designed on an Arduino Wifi Shield are usually quite simple as it doesn’t have much processing power to support heavy server. Arduino Wifi Shield is mostly used in home automation projects where home appliances are controlled by Wifi or can also be used for security purposes. In short, it has numerous applications and is widely used.
In today’s project, we will use Arduino UNO board for programming purposes, and will interface two leds with it and then we will control these leds via an online web server. Using that online web server, we will ON and OFF these leds on command. For controlling leds from an online server, we have to design two things:
- Online Web Server.
- Arduino Web Client.
Note:
- The complete project has been sent to all the subscribed members. If you want this project code, then Subscribe to our mailing list, and it will be automatically emailed to you as well.
Project Description
First of all, I will explain what we are doing and what we want to achieve. In hardware, we will use:
- Arduino UNO
- Arduino Wifi Shield
- LEDs x 2
- 10k ohm x 2
Their arrangement and pin configuration is shown in the Arduino Web Client section. We will arrange them in such a way that two leds will be mounted on the Arduino UNO shield. In web server, we will design a simple page, which will be having four buttons on it, which will be:
- LED 1 ON
- LED 1 OFF
- LED 2 ON
- LED 2 OFF
When someone will open this web page and will pres any of these buttons, respective task will be performed on the Leds. i.e. if someone pressed the LED 1 ON button then Led 1 present on the Arduino board will get ON and when someone press LED 1 OFF button, that Led will go OFF and same function will be performed for second led. There won’t be any connection between the hardware and that web server, the only connection will be the Wifi. The Arduino Shield must have a Wifi connection available and one sitting from across the world can control them. Now let’s discuss these two parts, one by one.
Online Web Server
I have designed the online web server on my own site The Engineering Projects. This is a php page which I have uploaded on my web server. In order to make this page, simply follow the below steps:
- Create a notepad and rename it to ArduinoWifi.php and save it somewhere, from where you can easily access it.
- The webserver code is for sale and you can buy it just for $50. We have input a lot of effort to accomplish this project that's why we have placed a very small amount on it. You can easily buy it by clicking the below button.
Buy WebServer Code
- Save the file again and our web page is now ready to be uploaded. This web page will act as a web server for the Arduino device and will send commands to it.
- Now we need to upload this web page on some website so that it can start working. In order to do so, you must have some web domain and hosting as I have mine on Godaddy or you can also use some free web hosting service.
- What this code is doing, its actually using a file system. Whenever any button on this web page is pressed, it simply create a txt file with a letter. In this code, when someone pressed LE 1 ON button, character “1" is saved in the txt file. Similarly character “2" is saved in the txt file when LED 1 OFF is pressed and so on.
Note:
- When you upload the webpage on the web server, then hit any button and check your web location where this page is uploaded, you must find a data.txt file in the same location.
- If you can’t find the data.txt then generate it by yourself because in some web servers, generation of such files automatically is not granted.
We are done with the Web Server part, now let’s come to the Arduino Web Client part.
Arduino Web Client
- First of all, place the Arduino Wifi Shield over the Arduino UNO shield, as shown in the below figure:
- Now, you need to place the two leds on two your Arduino UNO. The pin configuration for these LEDs are shown in the below figure:
- Two leds are connected to pin no 3 and 4 of Arduino UNO board and are pulled down.
- Now connect your Arduino UNO board with the computer and burn the below sketch into it.
#include <SPI.h>
#include <WiFi.h>
char ssid[] = “EvoWingle-12F3“; // your network SSID (name)
char pass[] = “093B3453“; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // your network key Index number (needed only for WEP)
int status = WL_IDLE_STATUS;
char server[] = “www.theengineeringprojects.com“; // name address for Google (using DNS)
String location = “/Examples/data.txt HTTP/1.0“;
char inString[500]; // string for incoming serial data
int stringPos = 0; // string index counter
byte statusLed = 0;
char c;
int led1 = 3;
int led2 = 4;
WiFiClient client;
unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds
boolean lastConnected = false; // state of the connection last time through the main loop
const unsigned long postingInterval = 10*1000; // delay between updates, in milliseconds
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
pinMode(led1,OUTPUT);
pinMode(led2,OUTPUT);
digitalWrite(led1, LOW);
digitalWrite(led2, LOW);
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println(“WiFi shield not present”);
// don’t continue:
while(true);
}
// attempt to connect to Wifi network:
while ( status != WL_CONNECTED) {
Serial.print(“Attempting to connect to SSID: “);
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
delay(10000);
}
Serial.println(“Connected to wifi”);
printWifiStatus();
Serial.println(“nStarting connection to server…”);
// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
Serial.println(“connected to server”);
// Make a HTTP request:
client.print(“GET “);
client.println(location);
client.println(“Host: theengineeringprojects.com”);
// client.println(“Connection: close”);
client.println();
//readPage();
}else{
Serial.println(“connection failed”);
}
}
void loop(){
while (client.available()) {
c = client.read();
Serial.write(c);
CheckingStatus();
}
if (!client.connected() && lastConnected) {
Serial.println();
Serial.println(“disconnecting.”);
client.stop();
}
if(!client.connected() && (millis() – lastConnectionTime > postingInterval)) {
PingRequest();
}
lastConnected = client.connected();
}
void PingRequest(){
if (client.connect(server, 80)) {
// Serial.println(“connected to server”);
// Make a HTTP request:
client.print(“GET “);
client.println(location);
client.println(“Host: theengineeringprojects.com”);
client.println(“Connection: close”);
client.println();
//readPage();
lastConnectionTime = millis();
}else{
//Serial.println(“connection failed”);
client.stop();
}
}
void CheckingStatus(){
inString[stringPos] = c;
if(c == ‘*’)
{
statusLed = inString[stringPos - 1];
stringPos = 0;
// Serial.write(statusLed);
delay(500);
UpdatingStatus();
// delay(500);
// client.flush();
// delay(10000);
//PingServer();
}
stringPos ++;
}
void UpdatingStatus(){
if(statusLed == ’1')
{
digitalWrite(led1, HIGH);
// Serial.write(‘OK’);
}
if(statusLed == ’2')
{
digitalWrite(led1, LOW);
}
if(statusLed == ’3')
{
digitalWrite(led2, HIGH);
}
if(statusLed == ’4')
{
digitalWrite(led2, LOW);
}
}
void printWifiStatus() {
// print the SSID of the network you’re attached to:
Serial.print(“SSID: “);
Serial.println(WiFi.SSID());
// print your WiFi shield’s IP address:
IPAddress ip = WiFi.localIP();
Serial.print(“IP Address: “);
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print(“signal strength (RSSI):”);
Serial.print(rssi);
Serial.println(” dBm”);
}
- Before burning this sketch into your Arduino Shield, you need to change few things which I have written in bold style in the above code, and mentioned below:Now, everything’s done, so power up your Arduino and make sure that it has got connected with the Wifi and then hit the LED 1 ON button on your web page. If everything’s gone fine then the led on your Arduino board will get ON.
- ssid is the name of your Wifi connection.
- pass is the password of your wifi connection.
- server is the server name on which the web page is uploaded, which in my case is my own site.
- location is the location of the txt file generated by the webpage, the above web page code generated a txt file in the same location and gives it a name data.txt so I simply used that. (This part is bit confusing but read it twice and you will get it.)
- I have added comments with the Arduino code but if still, you get into some trouble, ask in comments and I will try my best to resolve them.
Note:
- Before starting anything, first run the demo code which comes with the Arduino Library and make sure that your Arduino Shield get connected with your Wifi connection.
- Give the link of txt file generated by the web page, not the the web page itself.
That’s all for today, Stay Blessed, take care. :))
Circuit Designing of LCD with Arduino in Proteus ISIS
Hello friends, I hope you all are doing great. Today, I am going to share Circuit Designing of LCD with Arduino in Proteus ISIS. In my previous tutorial, I have posted a tutorial on How to use Arduino Library in Proteus. Using that library, we can easily test Arduino code in Proteus to check whether its working or not. If you haven't read that post then before starting it, first read it, as without adding the arduino library we can't use Arduino in Proteus.
Coming to today's post, as we have done adding the Arduino Library in Proteus, so I thought to do some projects on it and the first one I chose is quite simple one i.e. Circuit Designing of LCD with Arduino in Proteus ISIS. So we will have a look on how to show some characters on LCD using Arduino in Proteus. If you are working on LCD then you should also have a look at my new post Scrolling Text on LCD using Arduino. Let's get started with Circuit Designing of LCD with Arduino in Proteus ISIS:
Circuit Designing of LCD with Arduino in Proteus ISIS
- First of all, design a circuit of LCD and Arduino in Proteus ISIS, if you have already added the Arduino Library then you won't find any problem in finding the Arduino in components library of Proteus.
- You should also download this New LCD Library for Proteus.
- Design the circuit as shown in below figure:
- Now, we need to design Arduino sketch for LCD, so open Arduino software and place below code into it.
- You should have a look at How to get Hex File from Arduino.
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup()
{
lcd.begin(16, 2);
lcd.print("www.TheEngineer");
lcd.setCursor(0,1);
lcd.print("ingProjects.com");
}
void loop() {}
Note:
- For Arduino code, I have used Liquid Crystal Arduino Library, which you can download from the below link and add it in the libraries folder of Arduino software.
Download LiquidCrystal Arduio Library
- If you haven’t bought your Arduino UNO and LCD yet, then you can buy it from this reliable source:
- Now compile the code, and get the Arduino hex file which will be in the tmp folder, you can read Arduino Library for Proteus to know in detail how to get the hex file of Arduino sketch.
- Now double click the Arduino in Proteus ISIS and properties window will pop up.
- In properties panel, under the Program File section, browse to Arduino hex file as shown in below figure and upload it.
- Now click Ok and Run your simulation, if everything goes fine then your LCD will start showing the characters as shown in below figure:
- You should also have a look at these Arduino Projects for Beginners.
- That's all, was it difficult ??? I dont think so :) Anyways, if you got into any trouble, do ask in comments.
- In the coming posts, we will explore Arduino in Proteus ISIS more. Till then take care !!!