Infrared Sensor Guided Arduino Controlled L293D Robot ( Part 2 )

Here is part 2 of the Arduino controlled L293D Robot.

Part 2 includes Infrared Sensors.This is part of a series of instructables leading to a Line follower Robot.

QRD1114 Infrared Sensor connected to Arduino

Step 1: Wiring the Infrared Sensor to the Arduino

Negative from the IR Sensor connects to Negative on the Breadboard.

Middle Pin ( Positive ) from the IR Sensor connects to Positive on the Breadboard.

Last Pin ( Input ) from the IR Sensor connects to Analog input on Arduino Board.

In this case I had the Input from the IR Sensor connecting to Pin 3 on the Analog Input on the Arduino.

Step 2: Basic Code to Read the IR Sensor

int analogPin = 3;     // Infrared Sensor (Right lead) connected to analog pin 3
                                    // outside leads to ground and +5V
int val = 0;                  // variable to store the value read

void setup()
{
  Serial.begin(9600);          //  setup serial
}

void loop()
{
  val = analogRead(analogPin);    // read the input pin
  Serial.println(val);                           // debug value
}

Step 3: Code to Drive Forward When IR Sensor Value Is Less Than 100

// This is the basic code which runs a loop that makes the Robot go straight forward when the Infrared value is below 100.

int analogPin = 3;     // Infrared Sensor (Right lead) connected to analog pin 3
                                     // Infrared Sensor(middle Lead) connected to +5V
                                     // Infrared Sensor(Left Lead) connected to ground
                               
int val = 0;           // variable to store the value read


int LeftMotorForward = 10; // Pin 10 has Left Motor connected on Arduino boards.
int LeftMotorReverse = 9; // Pin 9 has Left Motor connected on Arduino boards.

int RightMotorForward = 12; // Pin 12 has Right Motor connected on Arduino boards.
int RightMotorReverse = 13; // Pin 13 has Right Motor connected on Arduino boards.

//------------------------------------------------------------------------------------------------

void setup()
{
  pinMode(LeftMotorForward, OUTPUT);  // initialize the  pin as an output.
  pinMode(RightMotorForward, OUTPUT);  // initialize the  pin as an output.
  pinMode(LeftMotorReverse, OUTPUT);  // initialize the  pin as an output.
  pinMode(RightMotorReverse, OUTPUT);  // initialize the  pin as an output.
 
   Serial.begin(9600);          //  setup serial
}

// The following Loop is to make the Robot go staright when the Infrared value is below 100

void loop()

{
   val = analogRead(analogPin);    // read the input pin
  Serial.println(val);             // debug value
 
  if (val <100)

// If the read value is < 100 then run the code below which will turn  both Left and Right Motor on making the Robot go straight.

  {
   digitalWrite(RightMotorForward, HIGH);   // turn the Right Motor ON
   digitalWrite(LeftMotorForward, HIGH);   // turn the Left Motor ON
   delay(10000);               // wait for  10 seconds
 
   digitalWrite(RightMotorForward,LOW);   // turn the Right Motor OFF
   digitalWrite(LeftMotorForward, LOW);   // turn the Left Motor OFF
   delay(10000);               // wait for  10 seconds
  }
 
}

Step 4: IR Value Is Greater Than 100

When IR Value is greater than 100 then the Motors are off.

Step 5: IR Value Is Less Than 100

When IR Value is Less than 100 then the Motors are turned on and the Robot drives forward for 10 seconds.