How to Make a Obstacle Avoiding Robot

How to Make a Obstacle Avoiding Robot:

Robotics is an interesting and fast growing field of engineering, the applications of robotics are increasing with the advancement of technology.In this tutorial we will make a simple robot.That is a obstacle avoiding robot.it can avoid any type of object.It is an Arduino based robot that uses Ultrasonic range finder sensors to avoid collisions.

Photo:(Electronics Hub):

Component:

• Arduino uno R3
• Ultrasonic sensor
• Motor Driver - L293D 
• Gear Motor x 2
• Wheel x 2
• Robot Chassic
• 9V Battery
• Battery connector jack
• Battery Cap
• Male to Male Jumper Wire
• Male to Female Jumper Wire

Circuit Design:

How does it work:

In this robot,we have used a ultrasonic sensor which works with ultrasonic sound.Here in this sensor their are two different sensor.Ones is transmitter sensor and another is receiver sensor.Transmitter sensor always emit a ultrasonic sound when a objects come  in front of this sensor.It will reflect the ultrasonic sound and the receiver receive the signal and arduino take this signal to perform a work which is preloaded.

How to upload program on arduino:

Code:
Arduino Program:

/*
 HC-SR04 Ping distance sensor:
 VCC to arduino 5v 
 GND to arduino GND
 Echo to Arduino pin 8 
 Trig to Arduino pin 9*/
#define echopin  8 // echo pin
#define trigpin 9 // Trigger pin


int maximumRange = 30;
long duration, distance;

void setup() {
  Serial.begin (9600);
  pinMode (trigpin, OUTPUT);
  pinMode (echopin, INPUT );
  pinMode (4, OUTPUT);
  pinMode (5, OUTPUT);
  pinMode (13, OUTPUT);
  pinMode (6, OUTPUT);
  pinMode (7, OUTPUT);
}

void loop ()
{

  {
    digitalWrite(trigpin,LOW);
    delayMicroseconds(2);
    
    digitalWrite(trigpin,HIGH);
    delayMicroseconds(10);
    
    duration=pulseIn (echopin,HIGH);
    
    distance= duration/58.2;
    delay (50);
    Serial.println(distance);
  }
  
  if (distance >= 30 ){
    digitalWrite(4,HIGH);
    digitalWrite(5,HIGH);
    digitalWrite(6,LOW);
    digitalWrite(7,LOW);
    delay (200);
  }
  
  else if (distance >=15 && distance <= 25) {
    digitalWrite (4,HIGH);
    digitalWrite (5,LOW);
    digitalWrite (6,LOW);
    digitalWrite (7,LOW);
    delay (1000);
  }
 else if (distance < 15){
   digitalWrite (4, LOW);
   digitalWrite (5, LOW);
   digitalWrite (6,HIGH);
   digitalWrite (7,HIGH);
   delay (1000);
   digitalWrite (4,LOW);
   digitalWrite (5,HIGH);
   digitalWrite (6,LOW);
   digitalWrite (7, LOW);
   delay (1000);
   
     
 }


}