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.

Infrared-Ir-Sensor-Receiver- This project uses an Arduino Uno, a TSOP1738 infrared receiver, and an IR remote to wirelessly control an LED. When a specific button on the remote is pressed, the Arduino ...

Infrared Light: Infrared light is a form of electromagnetic radiation with wavelengths longer than visible light. It's invisible to the human eye but can be detected by specialized sensors. IR Remotes ...

Posted in Arduino Hacks, Medical Hacks, The Hackaday Prize Tagged 2015 Hackaday Prize, hemoglobin, infrared, ir led, photodiode, photoplethysmography, PPG, pulse oximeter, Pulse oximetry ...

I selected this IR LED as well as this receiver. I began working on code to see if I could get a simple example running with an Arduino, a single IR LED, and a receiver. According to the data sheet of ...