Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	AHT20 (Temp/Humidity) + BMP280 (Pressure)
Interface Protocol	I2C
Operating Voltage	3.3V - 5V DC
Temperature Range	-40°C to +85°C
Humidity Range	0% to 100% RH
Pressure Range	300 hPa to 1100 hPa
Accuracy (Temperature)	±0.3°C
Accuracy (Humidity)	±2% RH
PCB Dimensions	22mm x 17mm x 3mm
Application	Weather Stations, IoT Projects, HVAC Monitoring

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Ideal for greenhouse monitoring

Using this to monitor conditions in my small greenhouse. It handles the high humidity well without drifting. Very satisfied with the build quality.

Anonymous

Mar 25, 2026

Rating: 5/5

Compact and reliable

Small footprint makes it easy to fit into tight enclosures. Reading speed is fast enough for real-time logging. Highly recommend for DIY electronics.

Anonymous

Mar 24, 2026

Rating: 5/5

High precision as advertised

I needed accurate barometric pressure data for altitude estimation, and the BMP280 part of this module delivers. The AHT20 is also very responsive to humidity changes.

Anonymous

Mar 06, 2026

Rating: 5/5

Perfect for my weather station project

This module works flawlessly with my ESP32. The I2C addresses are distinct, so no conflicts. Data readings are stable and match my reference instruments closely.

Anonymous

Mar 06, 2026

Rating: 4/5

Works great after figuring out wiring

The sensor itself is excellent. Took me a while to realize I needed pull-up resistors on the SDA and SCL lines for my specific microcontroller. Once fixed, it works perfectly.

Anonymous

Mar 03, 2026

Rating: 4/5

Good value, easy to integrate

Great sensor combo for the price. Setup was straightforward using standard libraries. Only giving 4 stars because the pin headers were not included, had to solder my own.

5 FAQ

Q: What are the default I2C addresses for these sensors?

A: The AHT20 usually defaults to 0x38 and the BMP280 to 0x76. These can sometimes be changed depending on the specific chip configuration, but these are the standard defaults.

Q: Does this module come with pre-soldered header pins?

A: No, the module typically comes without header pins to allow for flexible mounting options. You will need to solder your own headers or connect via wires.

Q: Which library do you recommend for reading data?

A: For Arduino IDE, we recommend the 'Adafruit AHTX0' library for the temperature/humidity part and 'Adafruit BMP280' for the pressure part. They are well-maintained and easy to use.

Q: Can I use this sensor outdoors directly in the rain?

A: No, the PCB and sensors are not waterproof. You must house the module in a breathable, weatherproof enclosure if using it outdoors to protect it from direct moisture and water.

Q: Is this compatible with 5V Arduino Uno boards?

A: Yes, the module includes a voltage regulator and level shifting, making it safe to use with 5V logic boards like the Arduino Uno, though it operates internally at 3.3V.

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