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.

If you have an Arduino that can act as a keyboard for a PC, the code almost writes itself. ... The serial communications is I2C and there’s a tiny optical sensor onboard along with an IR LED.

Panasonic started the infrared array sensor business with its 8 x 8 thermopile array called Grid-EYE. Grid-EYE is a 64 pixel IR camera in an all-in-one compact SMD package. Based on Panasonic’s MEMS ...