hc sr04 sensor get stuck at zero.

[mehmet zahit baş]

The sensor get stuck at zero when aimed too far away or too close. It keeps listening in the echo pin for a pulse it will not get.

[Tim Eckel]

This is not an issue with NewPing. It's with a batch of defective sensors that's been going around. A properly working sensor doesn't get stuck when pointed out of range.

[Tim Eckel]

Not an issue with NewPing, defective sensor.

[mehmet zahit baş]

I understand. Thank you for your fast reply. Your library is amazing. It has made my work a lot easier. Keep up the good work.

[Tim Eckel]

If you have a sensor that gets stuck like that, my suggestion is to only change the echo mode if the distance is zero. Something like this:

if (cm==0) {
  pinMode(echoPin, OUTPUT);
  digitalWrite(echoPin, LOW);
  pinMode(echoPin, INPUT);
}

You may also need some type of delay in that IF statement. Doing this in the library wouldn't be ideal. So, if you do have a defective sensor that gets stuck at 0 adding something like this after each ping is probably the best solution (other than getting another sensor).