Freematics Forum

I know this doesn't fit in here...

But how do i activate a output channel like

"digitalWrite(7, HIGH);"

It works on my standard arduino, but i can't activate any channel. Tried 5 to 12, but no response, voltage is zero.

Thanks for the answer.

Didn't work either, i defined a HardwareSerial myself and it works

Hi! I know it's the wrong section and should be posted in "Libraries" but somehow i can't post there. I've some issue compiling my project for the esp32 in Arduino 1.8.4. The compiler tells me "libraries\OBD2UART\OBD2UART.cpp.o:(.literal._ZN4COBD5beginEv+0x4): undefined reference to `...