I haven’t worked on my Drum machine for a long time. So in order that I don’t forget what I did I’m writing it down
I really liked the look of those backlit silicone button sequencers you see all over the place – such as this Adafuit Trellis kit – and wanted to try using them with my drum machine. So I ordered a bunch of them and broke out Eagle CAD
Just a quick photo of some of the many earlier revisions of the different parts of my quick-release mechanism for the Logitech G920.
Each one is a different revision with slightly adjusted dimensions to get a better fit. Some of the parts were deliberately stopped mid-print once I had enough printed out for the test fit I needed. This saves a lot of time.
At the back are some tests of the threads. I orginally went for a two part ring but simplified it later on to a single part. The threads in Fusion360 need to be manually adjusted to allow a decent amount of clearance. The exact amount depends on your printer and the filiment that you’re using. I used this tutorial as a guide
I recently bought myself a Logitech G920 Racing wheel it’s great fun for a bit of Dirt Rally but storing it afterwards is a bit tricky because of it’s akward shape.
So I thought I’d have a go at making a quick release mechanism to allow the wheel to detach from the base unit. At least that way I’d have two slightly smaller things to find a place for rather than one massive, heavy and akwardly shaped one.
I haven’t worked on my Drum machine for a long time. So in order that I don’t forget what I did I’m writing it down. As I write these posts I realise what a lot of dead-ends I have gone down…
This design was created in early 2018 and was intended to be an expanded version of the first PIC32 design with a some specific goals.
A quick update to say that I have released version 1.0 of the source code for the ChipStomp.
I’ve spent a fair bit of time making sure that the source is documented in the areas that are less clear and I have removed all redundant/experimental code in an attempt to avoid confusion with things I haven’t finished yet. That took a lot longer than I would ever have imagined.
You can find the entire project including the Eagle CAD schematics and Layout up on GitHub.
Fully assembled and working Chipstomp
It’s done. I’ve assembled the analogue side of the Chipstomp and finally have a fully working device. There were no errors to fix this time which was a nice surprise. Just lots of fiddly 0805 surface mount components to place.
I’ve made a quick video of the project to demonstrate what it can do.
I found some time this weekend to start assembly of my Chipstomp’s.
The digital side of the Chipstomp is assembled and up and running
My PCBs arrived from DirtyPCB.com today and they look pretty good! I’m hoping to find a bit of time this weekend to assemble one. Lets hope that I got my footprints right…
ChipStomp version 1 PCBs fresh out of the bag from China.
A higher resolution photo (3069×2456px 1.4Mb)
Here are the schematics for the Chipstomp.
I’ve tried to keep as much compatibility with the original DP32 circuit but I have removed superfluous elements such as the on-board potentiometer and one of the user leds. I’ve also added an additional tactile button, the OLED and resistor mixed Stereo to Mono input/outputs.
Other than that it’s essentially just a joining of the ChipKit DP32 with the Stomp Shield.
ChipStomp v1 (PDF 90Kb) – Eagle CAD schematic – Zipped (88Kb)
Chipstomp version 1 schematic PNG (2300×1500px, 80Kb)
Catmacey's stuff 