Put a resistor inline with the Arduino and monitor the voltage drop across the resistor with the scope. When the chip is working hard, it consumes more current, and code sections that take longer ...

The project is called xoscillo, and it allows an Arduino, or a Parallax USB Oscilloscope, to probe the signals while a computer does the heavy lifting.

Got an Arduino board laying around? Make your own oscilloscope in only four steps. It might be the geekiest DIY project ever.

The UnoProLogic2 Open Source Oscilloscope project is currently over on the Kickstarter crowd funding website looking to raise $1,800 in pledges to make ...