Jumper Wires Working Principle: IR Sensor Operation: The IR sensor emits infrared light from an LED and detects the reflected light with a photodiode. When an object comes within the sensor's range, ...

The part list consists of one Arduino, two resistors, and one IR emitter. That’s right, an emitter. When an LED (IR or otherwise) is reverse biased it can act as a light sensor.

Posted in Arduino Hacks Tagged arduino, arduino pro mini, candle, lighting, neopixel, neopixel ring, RGB LED, ws2812b ← Retrotechtacular: There’s More Than One Way To Escape A Submarine ...