This Wireling features the ATtiny25, a high performance, low-power AVR 8-bit controller. Moisture is detected using capacitance to measure dielectric permittivity of the surrounding medium. Water levels and temperature can be measured using this Moisture sensor.
The circuit board and components have a Conformal coating for moisture resistance, but the connector should not be submerged in water.
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Note* 5-Pin Wireling cables not included and sold separately.