I’m trying to use a Google AIY Voice V1 with Pi4J. I had a bit of trouble finding the pins, so I’m posting this here in case anyone else is looking. Basically; there are three numbers for the pins. The AIY SDK uses one number, the header has a different number, and (after experimentation I’ve determined that) the Pi4J API uses a different layout. Anyway, this table shows the RaspiPin for the Button and LED interfaces.