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 ...

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 → ...

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.