Wio Terminal GPIO pins in CircuitPython

Products & Technology Wio Series
#1

I’d like to use the Wio Terminal to do some MIDI I/O in CircuitPython. I’m using a standard DIN MIDI connector, not USB, because I want to communicate with synths and keyboards, not the USB host PC,

I’ve got a breakout board with the DIN plugs and opto-isolator. I can wire that to four of the GPIO pins. +5v and GND are obvious, but which two pins should I use for send/rev of the internal UART? I’ve gone with pins 8 and 10 since they’re labeled TXD and RXD.

And once I’ve done that, how do I tell CircuitPython which pins to read/write? I found some code at Adafruit’s site that shows how to do it on a different board, but it uses constants board.SDA and board.SCL … that’s not working for me (nothing happens) so presumably those are the wrong pins, but I can’t come up with names for the pins I’m using. Every name I’ve tried gives a compile error.

#2

Hi Snej, I’m the lead of CircuitPython for Adafruit. You can find all of the available names for any Python by printing out the result of dir() on it. For example:

import board
print(dir(board))

In this case, I think you want board.TX and board.RX.

1 Like
#3

Thanks for the help! Those names did work, although I had to swap the wires to the actual TX and RX pins to get any data … see my other thread about that.