Power Pins

• 3V - this is the power pad. It can be powered by 3V or 5V. Give it the same power as the logic level of your microcontroller - e.g. for a 5V micro like Arduino, use 5V.
• GND - common ground pad for power and logic.

Moisture Sensor Output

• Soil Prongs - there are two gold-plated prongs on the board that are inserted into the soil. The conductivity between these two prongs are used to read resistance and determine the moisture level in the soil.
• OUT - this is the analog sensor output. It is a measurement of the conductivity between the two prongs on the board. It is laid out as a large pad at the top edge of the board for use with an alligator clip.

JST-SH Port

On the left side of the board is a 3-pin JST-SH port. This port lets you plug in a JST-SH to 3-pin cable to access the GND, 3V and OUT signals separate from the large pads along the top edge of the board. This is handy if you want to use this sensor without alligator clips.