This program is a light barrier
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Raspberry Pi - light barrier

I developed a small prototype light barrier to measure the time how long a robot needs to travel through three laser light barriers. I used a Raspberry Pi ZERO W and three laser diodes and three LM393 photo elements to detect if an object is inside the light barrier or not.

light barrier

The program ist the easy to use and test program for the light barrier. It only shows how the LM393 photo ellements work together with the Raspberry Pi.

The program is more advanced and uses an RFID reader to identify the teams. A Blinkt! eight sement LED strip is used as race timer signal.

light barrier step by step guide

I published the step by step guide on my blog (for now German only):