My physical computing projects are coming along. I’ve built an infrared distance detector. I’m trying to tune the IR-LED frequencies to detect objects at very close range. I’ve hooked in a potentiometer to control the frequency of the LED, and am placing objects near and far and seeing what frequencies respond.
I’lll chart that data, and use it to build a frequency lookup table. the idea is to detect my Cable Car at distances of about 18", 9" and 2". Once in the 2" range, crawl to stop; wait 20 seconds, and reverse direction. I need an H-bridge or darlington array to control the cable car motor.