rahji.com

Teach your baby to be a hip hop producer early. This is a MIDI drum kit that I made using a microcontroller and another $2 find at Savers.

I made this keyboard from a $1 toy that I bought at Savers. I made some changes to the electronics including pitch control, a 555 timer circuit that adds extra resistance in secret places, a speed control for the timer, 1/4″ output jack, and a touch-contact for good measure. I fabricated the case from cold-rolled [...]

Just a quick experiment to show that the NESpad library I wrote for the Arduino microcontroller actually works. An NES Advantage joystick acts as a mini MIDI drum pad.

I wrote this library, called NESpad, for anyone who wants to interface an NES game pad with the Arduino microcontroller. I also made an SNES library (SNESpad), but I haven’t tested it with an actual SNES joystick.

Joysticks 101. Basically, we’ve got two types of joysticks: analog and digital. You’ve probably used both kinds. The buttons work pretty much the same on either kind – you either click it or you don’t – but the actual “stick” part is what makes them different. This post starts out with some basic joystick info [...]

My stylish project amp, in all its monophonic glory…

I tried to make a time machine using an AVR Tiny13 and a peanut butter jar. Okay, so maybe it’s not really a time machine, but it’s definitely a kind of trippy time-manipulator ala Doc Edgerton’s stroboscope experiments. Either way, it works and it’s pretty cool.

This is a list of different ways to determine exposure times for your pinhole cameras

Sort of weird, but a bunch of years ago I was really excited about the variety of tools that I had used in the span of only a few months of working on projects at the Massachusetts College of Art, at Handshouse Studio, and with the Timber Framer’s Guild. I guess I made this page [...]