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Reply To: Connecting Bare Wire Sensor to Jack Adapter

Home › Forums › Mayfly Data Logger › Connecting Bare Wire Sensor to Jack Adapter › Reply To: Connecting Bare Wire Sensor to Jack Adapter

2021-03-04 at 4:02 PM #15206
Shannon Hicks
Moderator

    For a Meter Hydros 21 sensor, check the manual that came with the sensor to double-check that they haven’t change the wiring colors lately, but the usual pattern is red is data, white is power, and black is ground.  So connect red to D2, white to Vcc, and black to GND.  For that screw terminal board, D2 will get connected to D7 if you plug the grove cable into the D6-7 socket on the Mayfly board.  We usually use the Mayfly’s D7 pin for SDI-12 sensors in all our sample code.