For anything related to the 'official' Speeduino boards (Eg v0.3, v0.4 etc)
#47479
With a BT module wired into the Speedy, BUT NOT CONNECTED (PAIRED), should a USB connection work?

I added a BT module & have TunerStudio successfully using it. However, if I unpair the BT and then try and connect over a hardwired USB it fails.

Completely unplugging the USB module allows the hardwired USB connection to work.
#47482
Do you have diode between BT module TX and arduino RX line?
If not then you need to take BT wires off when using USB.
Adding diode between BT TX and arduino RX line (cathode side to BT module) allows you keep BT in place and wired when using USB connection.

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