I took the schematics of the Sparkfun Pro Micro and changed the USB Micro female connector to a USB C male plug here on github. I hope that it would be able to allow others to prototype with arduino on the framework laptop.
Evidently, it’s a couple millimeters longer, so the casing for the expansion card (if made), would need to be extended a few mm outsidethe laptop.
Another reason why I wanted a USB C pro micro would be to add a dedicated QMK module for the laptop.
Can get this into a real thing of anyone would like. I am willing to make a PCB for this.
I’d love to get a PCB for this, but when I got a quote from PCBway, it came out to be a little over $250 for 5 (assembled). It’s obviously expensive for $50/board, but there’s also a chance that I might have made a mistake somewhere too. ¯\_(ツ)_/¯
Let me do a little bit of magic and I’ll get a PCB ready. A custom PCB that is.
Would you like the DEV-12587 3.3V/8MHz version or the DEV-12640 5V/16MHz version?
I’d go with which ever is cheaper, so it’d be more affordable for everyone.
They are exactly the same price, I can do both but I will do the 5v 16MHz first. On sparkfun’s website
The schematic is done, would you like the headers on the side of the card or on the inside with pin headers or something else.
If it’s possible, I’d like to have it retain the same footprint as the pro micro.
So with solder holes essentially. I would prefer having jumpers for ease of use.
I picked up the USB-C Adafruit QT Py RP2040 and I’m hoping with a male to male USB-C adapter that it will fit within the space of an expansion module pretty nicely. With the QT (Adafruit’s mini Stemma/Grove connection) I can hook up to an outside sensor or other devices (QT/Stemma hub?) pretty easily and I’m thinking there might be space to leave the short QT cable tucked back inside when it isn’t in use.
Yep, I could make a rp2040 aswell with a properly designed board so there is no jank at all.
I took a look at the adafruit listing and found this:
Pinout and shape is Seeed Xiao compatible
Someone posted about a module + seeduino xiao here. If you’re looking to get a USB C male to USB C male adapter, it would stick out just so slightly.
What would your final take on connection method?
Through hole connectors, please
When I do get this made one quick note is J1, the solder pad bypasses the regulator, so if you need 3 volts you would use the output on the headers and if you want 5 volts you connect to J1 as per the product page https://www.sparkfun.com/products/12640 and https://github.com/sparkfun/Pro_Micro/blob/master/Documentation/ProMicro16MHzv2.pdf But if you want to supply it voltage through the headers it will only output 3 volts.
Interestingly enough, I missed the USBC branch of the Sparkfun Pro Micro. I’ve updated the Github to use that as a base model for the PCB in the master branch, and moved my previous work into another branch.
That’s all good, as this will be a proper card so that’s all good.
PCB is done! Finishing touches will be done to finalize the design.