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 ...

This is a miniature infrared close object alert device for robotic/autonomous vehicles, industrial vehicles, etc. that uses an active infrared proximity sensor for effective close object detection.

If you have a few hours spare and fancy creating a new Arduino project in your spare time you might be interested in this fun Arduino infrared touchscreen music controller which has been created ...