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The daughter board is based on the PT100 daughter board, which is a daughter board specifically designed for DuetWifi and DuetEthernet. This daughter board allows two PT100 temperature sensors to be connected. These PT100 sensors can be two-wire or four-wire, but usually two-wire.
DuetWifi and DuetEthernet support up to two daughter boards, and the other two on the Duex2 or Duex5 expansion board, with four daughter boards, supporting a total of 8 PT100 sensors. Thermocouples and PT100 daughter boards can be mixed.