I recently had to build an infrared close proximity sensor that could tell if something was dropped in a parcel delivery drop box. After some searching, I ended up using a microcontroller and a piece ...

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 Microcontrollers Tagged arduino, infrared, ir, IR temperature sensor, IR thermometer, temperature sensor, thermometer ← USB On The ATtiny10 Talking Bacon Plushie Greets You At The Door → ...