The Arduino is an amazing piece of technology that can be used to power all kinds of gadgets, often using nothing more than a battery and various components that don’t cost more than a few bucks.

The Arduino is a great way for hobbyists and pros alike to experiment with programmable objects, but it can be confusing for beginners without these tools.

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 ...