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Home / Computer Hardware, Monitors & Peripherals / CJ-HJ31A Humidity Sensing Resistor, 23A/3180 Humidity Chip, HR202L Humidity Sensor Module
Computer Hardware, Monitors & Peripherals

Attributes

Brand -
Category Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals
Origin -
Model Number CJ-HJ31A
Sensor Type Resistive Humidity Sensor
Humidity Range 10% to 95% RH
Resistance Range 1KΩ to 250KΩ
Operating Voltage DC 3.3V - 5V
Response Time < 10 Seconds
Operating Temperature -10°C to 50°C
Pin Configuration 2-Pin Terminal
Package Color Black/White Options
Primary Application HVAC, Weather Stations, DIY Electronics

5 reviews

A

Anonymous

Apr 04, 2026

Rating: 5/5

Exactly as described

Fast shipping and the module works right out of the box.

A

Anonymous

Mar 21, 2026

Rating: 4/5

Good value

Accurate enough for home monitoring. Calibration needed though.

A

Anonymous

Mar 07, 2026

Rating: 5/5

Great for Arduino projects

Works perfectly with my Uno board. Easy to read values.

A

Anonymous

Feb 22, 2026

Rating: 3/5

Okay but sensitive

Works but very sensitive to touch. Handle with care.

A

Anonymous

Jan 28, 2026

Rating: 5/5

Reliable sensor

Been using these for months in my greenhouse setup. No drift yet.

5 FAQ

Q: What is the accuracy level?

A: Typically within ±5% RH under standard conditions.

Q: Is this compatible with Raspberry Pi?

A: Yes, it works with GPIO pins using an ADC converter.

Q: What is the lifespan?

A: Under normal conditions, expect over 5 years of operation.

Q: Can I use this outdoors?

A: It is not waterproof. Please house it in a protective enclosure.

Q: Does it come with a library?

A: No, but many open-source libraries exist for HR202L.

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