Lvothe:
HazardsMind:
ARD mini is fine, but look at the specs, I think one is 5 volts and the other is 3.3 volts. Most sensors use +5 volts, so make sure you know what your getting.The ultrasonic sensor look like it has 2 miniture cans on the front, and may protrude outwards. If you want something that be hidden easily, then go with the IR distance sensor. Both should work with the same code.
What ultrasonic sensor would you recommend?
Would a ARD micro work? And how to connect it to the lights? And power?