I use a 500 ohm resistor on the A17 GPIO line to prevent biasing of duo. This prevents noise on the tx line when not powered by usb c.
Then some heat shrink and it is good to go.
Very slight bias, but not enough to trigger uart.
Then some heat shrink and it is good to go.
Very slight bias, but not enough to trigger uart.
The IO board looks great. design by you?