1.Introduction:

                                  Obstacle detection robots detect the obstacle to stop themselves. This technique can be used in a vehicle in reverse gear to detect the obstacle and stop a vehicle. Also can be used in big industries where robots are used to shift the heavy jobs, these robots detect an obstacle in their predefined path and stop itself.

2.Arduino Uno:

  Arduino platform offers open-source hardware and software that is easy to use and is used widely for projects.

• Pin no 7,8,9,10 are used to driving the motors.
• Pin no 11 used to enable the motor driver IC.
• Pin no 12 is used to get interrupt from the IR module.

                                                               Fig1.Arduino

3.Motor driver:

• This module can drive two DC motors.
• If we give 1,0 to driver motor rotates in the forward direction, for input 0,1 motor rotates reverse direction, for 0,0 and 1,1 motor stops rotating.

                                                        Fig2.Motor driver module

4.IR Sensor Module:

• It sends IR rays continuously when obstacle detected it capture reflected waves from the obstacle.
• When obstacle detected it sends ‘0’ on the output pin.      

                                                           Fig3.IR Module

5.Circuit Diagram:

• Pin no 7,8,9,10 are the interface with the L293D motor driver module to drive the motors.
• Pin no 12 interfaces with an IR module to get interrupt from it.

                                                          Fig4.Circuit Diagram

7.Program

int obs=1; 
void setup() { 
 /*Declare input output pins */ 
 pinMode(7,OUTPUT); 
 pinMode(8,OUTPUT); 
 pinMode(9,OUTPUT); 
 pinMode(10,OUTPUT); 
 pinMode(11,OUTPUT); 
 pinMode(12,INPUT); 

} 

void loop() 
{ 
 obs=digitalRead(12); 
 if(obs==1) 
 { 
   /*Move robot forward*/ 
 digitalWrite(7,HIGH); 
 digitalWrite(8,LOW); 
digitalWrite(11,HIGH); 
digitalWrite(9,HIGH); 
 digitalWrite(10,LOW); 
} 
else 
{ 
 /*stop robot*/ 
 digitalWrite(7,LOW); 
 digitalWrite(8,LOW); 
digitalWrite(11,LOW); 
digitalWrite(9,LOW); 
 digitalWrite(10,LOW); 
} 
}