donperryjm

Guys, shielded cabling solved the problem.

Close to a classic car because it's using spark plug lead wires and a distributor. So not a points ignition but not much better either.

OK will try and let you know.

Sorry about that. I'm talking USB serial

Hello guys, Teensy 4.1 with sound/serial. I have this client with one of my devices in an automotive (car) environment. There is a harness from the device that goes in engine bay. Device works well, sound works and serial works. As soon as the...