HR202 Humidity Detection Sensor Module

The HR202 Humidity Detection Sensor module uses an HR202 resistive humidity element and an LM393 comparator to detect when the air humidity passes a level you set. It gives a digital output for simple on/off control and an analog output for a variable reading, which makes it an easy choice for Arduino humidity alarms.

HR202 Humidity Detection Sensor Specifications

• Sensing element: HR202 humidity-sensitive resistor
• Comparator: LM393
• Outputs: digital (DO) and analog (AO)
• Threshold: adjustable with the onboard potentiometer
• Indicators: power LED and digital output LED
• Digital output: connects to a microcontroller input or a relay module

HR202 Humidity Detection Sensor Applications

• Humidity alarms for storerooms, cupboards and server rooms
• Switching a fan or dehumidifier on through a relay
• Greenhouse and incubator monitoring
• School science and Arduino sensor projects

What's in the Box

• 1 × HR202 humidity detection sensor module

Tip: Set the switching point with the potentiometer while watching the output LED. The analog output gives a relative value, not a calibrated %RH reading; for accurate humidity measurements use a DHT22 or SHT-series sensor.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.