Plug the jumper extension cables into the pins of the water sensor. Connect the other ends of the jumper cable to the jumper end of the Stemma cable.

  • Be sure to connect the corresponding water sensor pins to the correct color of the stemma pins.
  • The (-) pin on the sensor connects to the BLACK cable from the stemma connector for GND
  • The (+) pin connects to the RED cable for POWER
  • The (S) pin connects to WHITE cable for DATA.
  • Plug the stemma cable into the A2 slot at the bottom right side of the back of the board.
  • The front will have the input labeled as A2.

How does it work?

The sensor has a very lightly biased transistor that is connected to two long sets of interlocking traces. When a little bit of water/condensation lands on the PCB and touches two of the traces, the transistor will turn on, setting the output pin high. 

This guide was first published on Oct 22, 2021. It was last updated on Mar 08, 2024.

This page (Add the Water Sensor) was last updated on Mar 08, 2024.

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