Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	HR202
Brand	TELESKY
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switch (DO)
Sensing Range	20% - 90% Relative Humidity
Response Time	< 1 Second
PCB Dimensions	32mm x 14mm
Mounting Hole Diameter	3.1mm
Interface	3-Pin Header (VCC, GND, DO)
Application	Arduino, Raspberry Pi, DIY Electronics

6 reviews

Anonymous

Mar 28, 2026

Rating: 4/5

Solid performance for plant monitoring

Using this to monitor humidity levels in my small indoor greenhouse. It handles the moist environment well. Just ensure you coat the connections if using in very high humidity long-term.

Anonymous

Mar 25, 2026

Rating: 5/5

Reliable digital output

Unlike some analog sensors that require calibration curves, this gives a clean HIGH/LOW signal. Perfect for simple alarm systems or fan controllers based on humidity thresholds.

Anonymous

Mar 23, 2026

Rating: 4/5

Good sensor, sensitive threshold

The sensor detects humidity changes quickly. I had to adjust the potentiometer on the back to get the switching point exactly where I wanted it, but once set, it is very reliable.

Anonymous

Mar 19, 2026

Rating: 5/5

Perfect for my weather station project

This HR202 module works flawlessly with my Arduino Uno. The digital output makes it very easy to read without needing complex analog conversion code. Great value for the price.

Anonymous

Mar 17, 2026

Rating: 3/5

Works but needs careful calibration

The module works as described, but the default sensitivity was a bit too high out of the box. Took some time to tune the potentiometer correctly. Good for the price point though.

Anonymous

Mar 11, 2026

Rating: 5/5

Easy to use for beginners

I am new to electronics and this was one of the first sensors I tried. The pinout is clearly labeled and there are plenty of tutorials online. It triggered my LED exactly when I breathed on it.

5 FAQ

Q: How do I adjust the sensitivity of the humidity detection?

A: There is a small blue potentiometer on the back of the PCB. Use a small screwdriver to turn it clockwise or counter-clockwise while exposing the sensor to your target humidity level until the indicator LED toggles.

Q: Does this module provide an analog output value or just a digital switch?

A: This specific HR202 module provides a digital switch output (DO). It goes HIGH or LOW based on the humidity threshold you set with the onboard potentiometer. It does not provide a variable analog voltage proportional to humidity.

Q: What is the current consumption of this module?

A: The module typically consumes less than 20mA during operation. The exact current draw depends on the status of the output transistor and the indicator LED, making it suitable for battery-powered projects.

Q: Is this sensor waterproof or suitable for outdoor use?

A: The sensor element itself is resistant to humidity, but the PCB and electronic components are not waterproof. For outdoor use, you must place the module inside a waterproof enclosure with vents to allow air circulation.

Q: Can I connect this directly to a 3.3V microcontroller like an ESP8266?

A: Yes, the module operates within a 3.3V to 5V range, so it is fully compatible with 3.3V logic microcontrollers such as the ESP8266 or ESP32 without needing a level shifter.

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