An Arduino can be used to test the life of any battery with less than 5 volts, Boxall says. So, for a quick way to see how much juice your AAA, AA, C, or D batteries have left, build this ...

Here's how I build my simplified 3D printed arduino animatronic eye mechanism. This is a good option if you'd like to try out some DIY arduino robotics but don't necessarily have access to certain ...