On the software end, the Arduino code is pretty simple, with only less than 50 lines and basic functions used. Beginners can readily understand and tweak the code to more accurately set the ...

His project lets you play simple algorithms as audio using AVR microcontrollers. Now the code work for this is very simple, but he hardware implementation is where things get interesting.

Build a Battery Tester. 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 ...