I bought an HC-SR04 Ultrasonic Sensor and included it in a very basic laptimer. THIS ONE
My problem now is, that it works like a charm in my apartment, while when I am outside it gets false values all the time.
Conditions: it was a little windy, sun was shining and a little (very little) dust was in the air. Does any of those trigger an echo on the sensor?
I am using the "NewPing" library with the median ping (10 times). Since it works in my apartment I don't think it's code related, any ideas how I may solve that? Maybe a more reliable sensor (which)?
Thanks, any hint highly appreciated.