“I’m interested in designing an expansion card and have a few ideas, but I’d love to hear more suggestions. I really liked this project: Dual RP2040 Dev Board and Debugger and was thinking of creating something similar using the new RP2350. A bit about me—I’m 16, based in the UK, and currently studying Electrical and Electronic Engineering at the T Level. Excited to learn and collaborate!”
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Oh, a RP2350 card would be great! Do you have ideas on what to do with it?
For a quick prototype without making a custom PCB, you could just stick one of the small RP2350 boards which are now available into a case, plus a plug held into position & wired up.
There is the “RP2350 Tiny” board size 18mm * 23.5mm * 2.1mm they say. USB pins, reset and boot lines on a 8pin 0.5mm pitch FFC connector. Plus a USB-C & button daughterboard. $5 shipped direct-from-china: aliexpress.us/item/3256808131385368.html.
And the “RP2350 MINI” board size 21mm * 25.5mm (plus port length). USB pins available at large solder pads on the bottom. Plus onboard USB-C & buttons. $5 aliexpress.us/item/3256808153403052.html
Both should fit github.com/FrameworkComputer/ExpansionCards/tree/main/Mechanical. And Iirc there can be a bit more space available than shown there. Though the “RP2350 Tiny” would have the need either an FFC breakout board or a custom USB-C male to FFC board. Whereas the “RP2350 MINI” though it might be a larger board, with it’s USB solder pads it could just be wired right to one of the little USB-C male boards that are sold. Which could probably even be hot-glued in place for that fun extra quick & dirty look!
Welcome to the forum btw.
It’s a shame that a vulnerability was found in the OTP memory breaking the root of trust & compromising it’s use for things like security keys. (picokeys.com/pico-fido) Though depending on your threat model I’d still be tempted to play with it for use with lower security / risk situations, and just epoxy the f*ck out of the board to make access to the needed pin a royal pain in the ass & not really worth it for the value of what it’s being used to protect. Maybe Raspberry Pi will eventually introduce a chip revision to fix it. tomshardware.com/raspberry-pi/it-looks-like-the-raspberry-pi-rp2350-hacking-challenge-has-been-beaten-hacker-gains-access-to-the-otp-secret-by-glitching-the-risc-v-cores-to-enable-debugging
Oh, and I see they made a RP2350 version of the extremely tiny “Core-A” board. 20.32 * 17. 78 * 3mm. $6 aliexpress.us/item/3256808319537520.html