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Home / Computer Hardware, Monitors & Peripherals / CJ-HR31 Humidity Sensor Module Hygristor Humidity-Sensitive Component Wide-Range Humidity Detection

Attributes

Brand -
Category Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals
Origin -
Operating Voltage 3.3V to 5V DC
Output Signal Digital Switch Output (0 and 1) and Analog Voltage
Humidity Detection Range 20% to 90% Relative Humidity
Response Time Less than 5 Seconds
Operating Temperature -10°C to 50°C
Interface Type 3-Pin Header (VCC, GND, OUT)
PCB Dimensions 32mm x 14mm x 9mm
Weight 3 grams
Material FR-4 PCB with Polymer Sensing Element
Warranty 30 Days Seller Warranty

5 reviews

A

Anonymous

Mar 21, 2026

Rating: 4/5

Good but Needs Calibration

Does the job for basic humidity detection. You need to calibrate it against a known source for accurate readings, but for the price, it is excellent.

A

Anonymous

Feb 23, 2026

Rating: 5/5

Perfect Module for Smart Home

Using this for my bathroom ventilation automation. It triggers the fan when humidity gets too high. Very satisfied with performance.

A

Anonymous

Jan 27, 2026

Rating: 5/5

Works Great with ESP32

Easy to integrate with my ESP32 project. The analog output is stable and the digital threshold is adjustable via the potentiometer.

A

Anonymous

Jan 25, 2026

Rating: 5/5

Fast Shipping

Product arrived well packaged and quickly. Tested it immediately and it responded to breath humidity instantly.

A

Anonymous

Jan 22, 2026

Rating: 3/5

Okay for the Price

Not high precision suitable for scientific use, but okay for hobbyist projects. The range is a bit limited at extreme ends.

5 FAQ

Q: Is this module compatible with 3.3V logic levels?

A: Yes, the module operates between 3.3V and 5V DC, making it compatible with most microcontrollers.

Q: Does it provide an analog output pin?

A: Yes, it provides both analog voltage output and digital switch output via the comparator.

Q: What is the expected lifespan of the sensing element?

A: Under normal operating conditions, the sensing element has a long operational life, typically several years.

Q: Are there any specific Arduino libraries required?

A: No specific library is needed. You can read the analog value using the standard analogRead() function.

Q: Is the sensor probe waterproof?

A: No, the sensing element is not waterproof. Please protect it from direct water contact or condensation.

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