Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	AHT21/GXHT30
Output Type	Digital I2C
Temperature Range	-40°C to +85°C
Humidity Range	0% to 100% RH
Accuracy (Humidity)	±2% RH
Accuracy (Temperature)	±0.3°C
Supply Voltage	2.4V to 5.5V DC
Response Time	< 8 seconds
Package Type	DFN Package
Application	HVAC, Smart Home, Industrial Monitoring

6 reviews

Anonymous

Mar 27, 2026

Rating: 5/5

Reliable humidity tracking

I installed ten of these in my greenhouse automation system. They have been running for three months without drift or failure. Highly recommended for agricultural monitoring.

Anonymous

Mar 25, 2026

Rating: 4/5

Solid performance in varying conditions

Used this in a server room monitor. It handles the temperature fluctuations well. Response time is decent, though not instant, which is expected for this class of sensor.

Anonymous

Mar 19, 2026

Rating: 4/5

Great value, small footprint

Excellent sensor for the price. The only reason for 4 stars is that the pins are quite small, so you need a steady hand for soldering if you aren't using a breakout board.

Anonymous

Mar 13, 2026

Rating: 5/5

Easy library support

Found plenty of existing libraries for ESP32 and Raspberry Pi. Got it up and running in under 10 minutes. The data output is consistent and clean.

Anonymous

Mar 07, 2026

Rating: 5/5

Perfect for my weather station project

These sensors are incredibly accurate and easy to interface with an Arduino. The I2C communication is stable, and the readings match my calibrated reference meter almost perfectly.

Anonymous

Mar 03, 2026

Rating: 5/5

Best in class for hobbyists

We bought a bulk pack for our workshop. Every single unit worked out of the box. The precision is impressive compared to older DHT11 modules we used previously.

5 FAQ

Q: Does this come with a breakout board or just the chip?

A: This listing is for the raw sensor module as pictured. If you need a breakout board with headers for easier breadboarding, please check our related accessories section.

Q: What is the I2C address for this sensor?

A: The default I2C address is typically 0x38, but please refer to the datasheet included in the download section for configuration options.

Q: How often should I calibrate this sensor?

A: These sensors are factory calibrated. Under normal operating conditions, they maintain accuracy for years without needing recalibration.

Q: Is this compatible with 3.3V logic levels?

A: Yes, the AHT21/GXHT30 operates between 2.4V and 5.5V, making it fully compatible with both 3.3V and 5V microcontrollers.

Q: Can this be used outdoors directly?

A: The sensor itself is not waterproof. For outdoor use, it must be housed in a breathable enclosure that protects against rain while allowing air circulation.

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