twa.ninja | Tim's Site for Stuff

Electronics Blog Entries

oMIDItone - Part 2

Written by Tim on 2019-05-10 20:56 UTC

When last we visited the oMIDItone project, the plan was to turn the test code into a class, and add more heads to allow for a wider range of pitches to be played at once. Sounds simple enough, but it took a lot longer than I ever thought it would, with many complications and lessons along the way. I'll go over everything in roughly the order it happened in, starting with code challenges, then moving on to hardware challenges, and finally the (more or less) working prototype. Hold on to your hats, as this post is almost as long as it took me to build the damn thing.


Making Video Game Controllers with Teensy

Written by Tim on 2019-03-22 13:45 UTC

I recently taught a class about using Teensy as a USB game controller input for your computer. It's about an hour and a half of me rambling about how to connect various inputs, how to use the Teensy USB libraries, and going over example code.


oMIDItone - Part 1

Written by Tim on 2018-12-20 14:06 UTC

I recently received an Otamatone as a gift. I quickly found out I lack the training to accurately hit notes by ear. As a solution to my lack of skill, I decided to modify my Otamatone into a MIDI-controlled instrument. This is the story of my first attempt at doing so.


4x4 Keyboard Cases

Written by Tim on 2018-07-09 18:21 UTC

My friend Marv was selling some 4x4 mechanical keyboard kits, and I drew up laser-cut acrylic cases for them. The first case is for the original design which used an arduino micro. This turned out to be a difficult-to-track-down MCU, and another friend dvdfreitag has made a new version which uses the much more readily available Pro Micro for the MCU.


LimeSDR Mini Case and FM Filter

Written by Tim on 2018-05-30 03:17 UTC

I made a laser-cut acrylic case for my LimeSDR Mini. CAD Files below. I also installed an FM filter. You can see the comparison before and after on the ameteur 20m band, and boy does it make a world of difference.


Phase Shift Guitar

Written by Tim on 2013-06-12 17:20 UTC

Back in 2013 I made a small guitar for playing Phase Shift by cannibalizing a Wii Guitar Hero controller. It runs on an Atmega 32u4 and is housed in laser cut plywood and acrylic, and contains some (poorly utilized) Addressable LEDs.