Simple Infrared LED and Photodiode tester

This is a simple Infrared LED and Photodiode tester using Arduino-compatible microcontroller. Purpose: I received a new batch of IR LEDs and IR photodiodes. I need to test them before signing them off. I have limited tools at home. So I devised a simple test for the IR LEDs and the IR photodiodes using Arduino-compatible microcontroller. In my case, it was a Wemos D1 Mini R2 ESP8266.”

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