DAC BOARD > Raspberry Pi 3 Model B connector J8
SCK > Not wired (Internally generated)
BCK > PIN 12 (GPIO18)
DIN > PIN 40 (GPIO21)
LRCK > PIN 35 (GPIO19)
GND > PIN 6 (GND)
VIN > PIN 2 (5V)
Pinouts - Credit Kamran Sethi
Driver setup and Mplayer Software install:
For the command line player on an existing system, the setup instructions are here:
https://support.hifiberry.com/hc/en-us/articles/205377651-Configuring-Linux-4-x-or-higher