Stopping turning servo motor after an obstacle is detected by ultrasonic sensor with Arduino

Question

I want to stop a servo motor which turns continuously until an obstacle is detected by ultrasonic sensor. For instance, I want the servo motor to stop when the obstacle is within 5 cm of the ultrasonic sensor. If there is no obstacle, servo motor should turn without stopping.

However, after the obstacle is removed, my servo motor starts rotating from a different angle, not where it stops. I added servo motor rotation part of Arduino code.`

  void loop() {

    for (int i=0; i<=180; i++) {  
      distance = calculateDistance();
      if (distance <= 10){
        moveStop();
      } else {  
        moveForward();
        myServo.write(i);
        delay(5);  
      } 
    }

    for (int i=180; i>0; i--) {  
      distance = calculateDistance();
      if (distance <= 10) {
        moveStop();
      } else {  
        moveForward();
        myServo.write(i);
        delay(5);
      }

Answer 1

the problem is that i gets continously counted even when the object is in the way. cant recreate your setup exactly but I hope this helps you out

int y = 0


void loop() {

  for(int i=0;i<=180;i++){  

    distance = calculateDistance();
    if (distance <= 10){
      moveStop();
      y++;                  //"counts the time" the servo is blocked by object
      }
    else{  
      moveForward();
      myServo.write(i-y);   //and subtracts that time from i
      delay(5);  
      } 
    }

  for(int i=180;i>0;i--){  

  distance = calculateDistance();
  if (distance <= 10){
    moveStop();
    y++;
    }
  else{  
    moveForward();
    myServo.write(i+y);              //same but in reverse
    delay(5);
    }