I need assistance for a wall avoiding robot.

Projects Discussion and Showcase Robotics
1

Thanks

2

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3

This ought to work, assuming sensor1 is on the left, sensor2 is in the middle, and sensor3 is on the right, and this code is in the loop() function.

while(distance2 <= 30) {
    // First sensor input/output init
  digitalWrite(trigPin1, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin1, HIGH);
  delayMicroseconds(10);

  digitalWrite(trigPin1, LOW);

  duration1 = pulseIn(echoPin1, HIGH);

  distance1 = duration1 / 58.2;

    // Second Sensor input/output init
  digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);

  digitalWrite(trigPin2, LOW);

  duration2 = pulseIn(echoPin2, HIGH);

  distance2 = duration2 / 58.2;

    // Third Sensor input/output init
  digitalWrite(trigPin3, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin3, HIGH);
  delayMicroseconds(10);

  digitalWrite(trigPin3, LOW);

  duration3 = pulseIn(echoPin3, HIGH);

  distance3 = duration3 / 58.2;
  if(distance1 > distance3 && distance1 > 35 /*Arbitrary distance*/) {
    moveBot(0, 1.0); //Arbitary speeds, will turn on the spot, could be moveBot(0.5, 1.0);
  } else if(distance3 > distance1 && distance3 > 35) /*Arbitrary distance*/ {
    moveBot(1.0, 0); //Arbitary speeds, will turn on the spot, could be moveBot(1.0, 0.5);
  } else {
    moveBot(1.0, 0); //Arbitary speeds, will turn on the spot, could be moveBot(1.0, 0.5);
    delay(100); //Arbitrary delay
  }
}
moveBot(1.0, 1.0);

I haven't tested it on a robot, but it ought to do the job, assuming moveBot() works fine. I can't see any errors, but you might need to troubleshoot a bit. I'm NOT a perfect programmer. The delays, distances, and speeds are all arbitrary, you might need to increase/decrease some of them depending on how fast your robot goes.