How to make obstacle avoiding robot using Arduino.

In this blog, I will explain you how to build a obstacle avoiding robot using Arduino UNO.

Materials Required;

1.Arduino uno/nano/mega/mini.
2.Motor driver L298n.
3.Two dc motors.
4.Two wheels with high grip
5. One chasey.
6.One caster wheel.
7.Ultrasonic Sensor.

Circuit Diagram

circuit design in Fritzing

What is an ultrasonic sensor?

An ultrasonic sensor is an instrument that measures the distance to an object using ultrasonic sound waves.

An ultrasonic sensor uses a transducer to send and receive ultrasonic pulses that relay back information about an object’s proximity.  

High-frequency sound waves reflect from boundaries to produce distinct echo patterns.

Arduino code

int trigPin = 9; int echoPin = 10; int revright = 4; //REVerse motion of Right motor int fwdleft = 7; int revleft= 6; int fwdright= 5; //ForWarD motion of Right motor int c = 0; void setup() { //Serial.begin(9600); pinMode(5, OUTPUT); pinMode(6, OUTPUT); pinMode(4, OUTPUT); pinMode(7, OUTPUT); pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); // put your setup code here, to run once: } void loop() { long duration, distance; digitalWrite(trigPin,HIGH); delayMicroseconds(1000); digitalWrite(trigPin, LOW); duration=pulseIn(echoPin, HIGH); distance =(duration/2)/29.1; //Serial.print(distance); //Serial.println("CM"); delay(10); if((distance>20)) { digitalWrite(5,HIGH); // If you dont get proper movements of your robot, digitalWrite(4,LOW); // then alter the pin numbers digitalWrite(6,HIGH); // digitalWrite(7,LOW); // } else if(distance<20) { digitalWrite(5,LOW); digitalWrite(4,HIGH); digitalWrite(6,HIGH); //HIGH digitalWrite(7,LOW); } } Github link-https://github.com/AmanJaiswal210/Avoid-obstacle-Robot Media gallery