My account’s probably going to be blown to kingdom come for asking a question regarding the enemy ;), but here goes anyway.
I’m making a BT OBD dongle and wish to connect the ELM327s UART ports (ELM running at 5v) to the 3.3v bluetooth modules UART to send to a receiving laptop.
I’m thinking the easist way to go is to use a diode and resistor pulled up to 3.3v on the ELM tx line running to the BT module.
But here’s the thing. I know the ATmega168/328s’ RX lines are fine with 3.3v registering as a high signal, but is the same true of the PIC? :-/
Any help would be much appreciated.