fwecjoy more words
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@ -16,6 +16,10 @@ profilePicture = "img/triangels.png"
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pygmentsCodeFences = true
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pygmentsCodeFencesGuessSyntax = true
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[markup]
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[markup.goldmark]
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[markup.goldmark.renderer]
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unsafe = true
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[outputs]
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home = ["HTML"]
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@ -2,24 +2,28 @@
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title: "Framework joystick"
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date: 2025-07-11T22:11:00+01:00
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draft: false
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summary: "PSP joystick extension with ch32v003 for framework laptops..."
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images: ["/static/img/led-cricle-rainbow.png"]
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summary: "PSP joystick 🕹️ extension with ch32v003 for framework laptops..."
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images: ["(/img/FW-EC-PSP-Joy-inserted.jpg"]
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---
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I attended [38c3](https://events.ccc.de/congress/2024/infos/index.html) last year and it was amazing as always. I brought a modified robot vacuum to the event (it has BLDC motors and goes fast). But I forgot the gamepad so I chouldn't even drive it around :/
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So instead of goofing around I goofed around in KiCad and make this[^1]:
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I ordered the PCBs just before leaving for new years eve. And with every PCB project I needed a secound iteration. The error that got me wasn't actually in the design. I left the tickness of the PCB at the standard of 1.6mm and so the USB-C plug did not fit as its designed for 0.8mm PCBs 🤦.
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It wasn't nice but by bending all of the USB-C plug's pins I was able to solder them. After flashing the [gamepad example](https://github.com/cnlohr/rv003usb/tree/master/demo_gamepad) from cnlohr's software usb library for the ch32v003[^2] it just works :D It could use some offset calibration (leaving the joystick in the middle does not result in it reporting 0,0) and the imu sensor i added has no driver yet, but I was able to control the robot at this point so I call the project done for now :)
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<div class="image-row">
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<img src="/img/FW-EC-PSP-Joy-inserted_small.jpg" alt="FW-EC-PSP-Joystick">
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<img src="/img/FW-EC-PSP-Joy-uninserted_small.jpg" alt="FW-EC-PSP-Joystick uninserted">
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</div>
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...I put the design files[^3] and the code on [github](https://github.com/schnilz/FW-EC-PSP-Joy). So feel free to make your own (there be dragons; no documentation, ask questions maybe)
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It is an extension module for Framework computers. I own a Framework 13 laptop which has 4 slots to put extension cards in. My configuration is now 1 green USB-C, 1 USB-A, 1 HDMI and 1 Joystick.
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I ordered the PCBs just before leaving 38c3 for new years eve. And with every PCB project I of cause needed a secound iteration. The error that got me on the first version wasn't actually in the design. I left the tickness of the PCB at the standard of 1.6mm and so the USB-C plug did not fit as its designed for 0.8mm PCBs 🤦.
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It wasn't nice but by bending all of the USB-C plug's pins I was able to solder them and validate the rest of the design. After flashing the [gamepad example](https://github.com/cnlohr/rv003usb/tree/master/demo_gamepad) from cnlohr's software usb library for the ch32v003[^2] it just works :D But because of the wrong thickness and bend USB pins the PCB was realy twisted when inserted into the laptop. Thats why I reordered the PCB with the correct thickness[^3]. This secound version's hardware works as well and after tweeking the example-software a bit (changed the joystick axes to ADC measurments) the overall thing works quite well i must say. It could use some offset calibration (leaving the joystick in the middle does not result in it reporting 0,0) and the imu sensor i added has no driver yet, but I was able to control the robot at this point so I call the project done for now :)
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...I put the design files[^4] and the code on [github](https://github.com/schnilz/FW-EC-PSP-Joy). So feel free to make your own (there be dragons; no documentation, ask questions maybe)
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[^1]: the PCB, the rest was designed later
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[^2]: THE 10cent riscV microcontroller!
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[^3]: all CAD files created with [FreeCAD](https://www.freecad.org/) <3
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[^3]: And I included some minor changes like a complete redesign to make one sided PCB assembly possible.
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[^4]: all CAD files created with [FreeCAD](https://www.freecad.org/) <3
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@ -254,6 +254,19 @@
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margin: 0.7rem;
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}
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.image-row {
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display: flex;
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justify-content: center;
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gap: 1rem;
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/* space btwn images */
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margin: 1rem 0;
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}
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.image-row img {
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max-width: 100%;
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height: auto;
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}
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article .footnotes {
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font-size: 0.75em;
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clear: inline-end;
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