AKKR8 supports external temperature probes (Dallas 1-wire) that can be connect to the screw terminals on the board. There is already a resistor on the board, so you do not need to think about that.
The 1-Wire interface can use three pins on the board and with two pin devices as well. When using three pin devices the power pin connects to 3V3.
AKKR8 Sensor is the 1-Wire interface Master, and so is expected to supply power to the external devices at 3.3V.