IR controlled Robt car

Hello everyone, This is my first post on this community. I hope my project will be helpful to all.

To do the project, we have the following two experiments to be completed,

1. IR Decoding

2. IR Robot Main Program

IIR DECODING

My project is all about IR communication where a transmitter and a receiver are used. ARemote act as an IR Transmitter and anICacts as a receiver.IR rays are electromagnetic waves that are invisible to the human naked eye. The IR Receiver IC used here isTSOP1738can be operated up to 38MHZ.

The Remote has different frequencies for each button. As we have to control the movement of the robot, we candecodethe frequencies for forwarding, Backward, Left, Right movement. First to decode the frequencies, try connecting your TSOP1738 IC and Ardunio Uno through the following connection.

=>>Connect OUTPUT to PIN 11 on Arduino Uno

=>>Connect VCC to VCC on Arduino Uno

=>>Connect GROUND to GND

#include <boarddefs.h>

#include <IRremote.h>

#include <IRremoteInt.h>

#include <ir_Lego_PF_BitStreamEncoder.h>

int RECV_PIN = 11;

IRrecv irrecv(RECV_PIN);

decode_results results;

void setup()

{ Serial.begin(9600);

irrecv.enableIRIn(); // Start the receiver}

void loop() { if (irrecv.decode(&results)) { Serial.println(results.value, HEX); irrecv.resume(); // Receive the next value }}

Now the program willl be explained in detail step by step.

1. Initially, the Header files for IR Remote are to be included, i.e,

#include <boarddefs.h>

#include <IRremote.h>

#include <IRremoteInt.h>

#include <ir_Lego_PF_BitStreamEncoder.h>

2. The next step is to declare the IR receiver output pin. Hence declare the IR receiver pin on pin 11, i.e,

int RECV_PIN=11;

3. The next step is to set the BAUD RATE to 9600, i.e,

Serial.begin(9600);

4. Place a conditional statement for obtaining the decoded frequency values, i.e,

if (irrecv.decode(&results))

{

Serial.println(results.value, HEX);

irrecv.resume();

}

5. The last step is to upload the program to Arduino and open the serial monitor on the Right top corner.

6.Now press a button on your remote, simultaneously you get a decoded HEX CODE on the serial monitor.

7. From the HEX codes obtained, select a particular code for forwarding, backward, left, and right movements.

0xC1AA0DF2 - Forward button

0xC1AA4DB2 - Backward button

0xC1AACD32 - Left Button

0xC1AA8D72 - Right Button

0xC1AA11EE - Stop Button

II IR ROBOT MAIN PROGRAM

Now the Automation or Robot control is done by connecting

1. A High volt dc motor

2. A 12-volt Rechargeable battery

3. An Arduino Uno board

4. A Motor driver.

The Connections are given as follows,

Now the High volt Dc motor is interfaced with an Arduino Uno microcontroller using a Dual H bridge motor driver module(L293D).

Motor 1 ------> PIN 2, PIN 3

Motor 2------> PIN 4, PIN 5

At least a 12-volt Rechargeable Dc supply is given to the motor driver.

The decoded frequencies from before the experiment are then inserted into the following main program for doing perfect automation.

The code

#include <boarddefs.h>

#include <IRremote.h>

#include <IRremoteInt.h>

#include <ir_Lego_PF_BitStreamEncoder.h>

int receiver = 11; // Signal Pin of IR receiver to Arduino Digital Pin 11

IRrecv irrecv(receiver); // create instance of 'irrecv'

decode_results results; // create instance of 'decode_results'

void setup()

{

Serial.begin(9600);

Serial.println("IR Receiver Button Decode");

irrecv.enableIRIn(); // Start the receiver

pinMode(2,OUTPUT);

pinMode(3,OUTPUT);

pinMode(4,OUTPUT);

pinMode(5,OUTPUT);

}

void loop()

{

if (irrecv.decode(&results)) // have we received an IR signal?

{

switch(results.value) //case starts

{

case 0xC1AA0DF2: //MOVEMENT -FORWARD

digitalWrite(2,HIGH);

digitalWrite(3,LOW);

digitalWrite(4,HIGH);

digitalWrite(5,LOW);

break;

case 0xC1AA4DB2: //MOVEMENT- BACKWARD

digitalWrite(2,LOW);

digitalWrite(3,HIGH);

digitalWrite(4,LOW);

digitalWrite(5,HIGH);

break;

case 0xC1AACD32: //MOVEMENT- LEFT

digitalWrite(2,LOW);

digitalWrite(3,HIGH);

digitalWrite(4,HIGH);

digitalWrite(5,LOW);

break;

case 0xC1AA8D72: //MOVEMENT- RIGHT

digitalWrite(2,HIGH);

digitalWrite(3,LOW);

digitalWrite(4,LOW);

digitalWrite(5,HIGH);

break;

case 0xC1AA11EE: //MOVEMENT- stop

digitalWrite(2,LOW);

digitalWrite(3,LOW);

digitalWrite(4,LOW);

digitalWrite(5,LOW);

break;

default: //incase you pressed other buttons

Serial.println(" other button ");

} // case ends

delay(100); // to not get immediate repeat

irrecv.resume(); // receive the next value

}

}

The main program is explained step by step below,

1. Include the same IR Header files as done for the decoding experiment.

2. Declare the IR output to PIN 11.

3. An Instance for Receiving & Decoding is created, i.e,

IRrecv irrecv(receiver);

decode_results results;

4. As usual, the BAUD RATE is set to 9600, i.e,

Serial.begin(9600);

5. Setup the Motor output to PIN 2, PIN 3, PIN 4, PIN 5.

6. In the loop function, To check if we have received the IR signal by

if (irrecv.decode(&results))

7. use a Switch case to perform any particular operation at a time. The syntax for the switch case is...

switch case syntax

8. place the corresponding HEX frequency Code in each case and control your robot's movement.

9. A delay is given in order for the Relaxation and then resume the IR decoding.

delay(1000);

irrecv.resume();

10. Compile and Upload the program to the Microcontroller and check the result using the Remote.

After uploading the main program code into Arduino Uno,PRESSthe Remote Button for which the frequency is decoded so that the specified operation is executed.

Try this concept for connecting your home appliances like BULB, FAN, TUBELIGHT and enjoy watching them work.

The Schematics and code are available for Download. Please don't just copy the code, Instead, understand them before downloading it.

Thank you!!!!!! for watching and For any Doubts please leave your comments.