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2021-03-04 at 4:02 PM
#15206
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,
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.
