The sensor is an open electric circuit with an operational amplifier. The measuring element responds to changes in conductivity and provides a humidity-dependent analog output A0 as well as a digital signal for simple switching. Thanks to the adjustable switching point via a potentiometer, sensitivity can be easily adapted to the environment. Power supply 3.3–5 V allows for easy use in automation projects and when connecting to a LAN controller.
Connect the sensor output VCC to PIN +3.6V of the LAN controller. Connect the GND output to the GND input on the LAN controller and the DO output to a free digital input INPD on the LAN controller.