[Mark] from SpikenzieLabs was wrapping up a project using an Arduino the other day and found himself in need of a few more I/O pins. He could have added extra circuitry to the project, but he decid… ...

You can check out a video of [Martin]’s theremin in action on his guide. Posted in Arduino Hacks, Musical Hacks Tagged 7400, arduino, oscillator, theremin ...