Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Communication Interface	I2C
Operating Voltage	1.8V to 3.6V
Temperature Range	-40°C to +85°C
Humidity Range	0% to 100% RH
Temperature Accuracy	±0.5°C
Humidity Accuracy	±2% RH
Response Time	< 2 seconds
Package Type	SMD Module with Header Pins
Dimensions	20mm x 15mm x 8mm
Compatibility	Arduino, Raspberry Pi, ESP32, STM32

6 reviews

Anonymous

Mar 31, 2026

Rating: 5/5

Excellent accuracy and speed

I run a long-term environmental logging setup. This sensor has been running for three months without drifting. The response time is significantly faster than the DHT series, allowing me to capture rapid humidity spikes accurately.

Anonymous

Mar 30, 2026

Rating: 4/5

Reliable but needs pull-up resistors

Works great once you remember to add external pull-up resistors to the SDA and SCL lines if your board doesn't have them built-in. Once connected properly, the humidity readings are very responsive to changes in the room.

Anonymous

Mar 27, 2026

Rating: 4/5

Great for greenhouse monitoring

Using this to monitor humidity in my indoor herb garden. It seems very accurate compared to my standalone hygrometer. The only reason for 4 stars is that the library documentation could be slightly clearer for beginners, but I got it working eventually.

Anonymous

Mar 16, 2026

Rating: 5/5

Solid industrial grade performance

Integrated this into a custom PCB for a client prototype. The calibration data factory-programmed into the chip is excellent. Readings are consistent across multiple units we tested. Fast shipping and good packaging too.

Anonymous

Mar 09, 2026

Rating: 5/5

Perfect for school projects

Bought this for my final year engineering project. It connects easily to the Arduino Uno via the breakout board. The precision is impressive for the price point. My professor was happy with the data logs I generated.

Anonymous

Mar 07, 2026

Rating: 5/5

Much better than the old DHT11

Finally upgraded my weather station project from the DHT11 to this AHT20 module. The difference in reading stability is night and day. The I2C interface saves GPIO pins on my ESP32, which was a huge bonus. Highly recommended for anyone needing reliable data.

5 FAQ

Q: Does this support 5V logic levels directly?

A: The AHT20 chip operates at 1.8V to 3.6V. However, most breakout modules, including ours, feature a voltage regulator and level shifters, making them safe to use with 5V microcontrollers like the Arduino Uno.

Q: What is the maximum cable length recommended for I2C connection?

A: For standard I2C speeds (100kHz), we recommend keeping the cable length under 20-30cm for optimal reliability. If you need longer distances, consider using an I2C extender or buffer chip.

Q: Does this module come with the necessary pull-up resistors installed?

A: Yes, our AHT20 breakout module includes the required 4.7kΩ pull-up resistors on the I2C lines, so you can connect it directly to your microcontroller without extra components.

Q: Is there an Arduino library available for this sensor?

A: Absolutely. You can use the popular 'AHT20' library by ClosedCube or the 'Adafruit_AHTX0' library, both of which are available in the Arduino Library Manager.

Q: Can this sensor be used outdoors in direct rain?

A: No, the AHT20 module itself is not waterproof. While the sensor chip can handle high humidity, direct exposure to water or rain will damage the electronics. Please house it in a ventilated waterproof enclosure for outdoor use.

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