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 ...

He used a stepper motor to rotate the object being scanned, and an Arduino for ... has released the code, and it should be easy enough to repurpose it with a more accurate sensor.

[Dave Jones] from EEVBlog.com takes “Arduino ... IR codes on his oscilloscope from an IR decoder (yellow trace) as well as using an IR photo transistor (blue trace) which showed the code ...