Description
Reviews
| 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 |
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.
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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