I’m making a custom keyboard with a Raspberry Pi Pico as the MCU, and i don’t understand what all the different pins are for and how they should be wired up to my key matrix and trackpoint.
My current understanding is that GPIO are normal pins that can be wired to the rows and columns, but what of VBUS, VSYS, 3V3, and all the others that aren’t just GPIO or GND? And how should the ground pins be used here?
The schematic currently doesn’t include the trackpoint because i’m planning to hand wire it and the MCU to the PCB, so i can put them under the PCB in the case and i don’t have to try to fit them onto the board. Is there a better way to connect these that won’t require adding a bunch of space to the board to fit the MCU?
Not without moving some switches to fit the trackpoint and diodes to fit the Pico. But how hard can hand wiring that one part be⸮
I’m still not clear on how the ground should work. Is it enough to just wire every row to a ground pin as well as a normal input pin?
I was halfway through a message about return path impedance, but remembered the pico is a carrier board with its ground built in it’s USB connector, and the switches are hardly going to care.
My bad, you’ll be fine 👍