NTE30116 Tinted Blue 5mm Infrared LED Emitter (940nm) SM0038 Photo Module for PCM Remote Control System (38kHz) The principle of this setup is somewhat simple and self-explanatory. In this circuit, ...

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 air pollution, air quality, arduino, nova pm sensor, pm10, pm2.5, pollution ← Pi-Based Spectrometer Puts The Complexity In The Software ...