What Is the AHT20? I²C Humidity and Temperature Sensor and Uses
The AHT20 is a sensor that measures both humidity and temperature on one chip over I²C. It is a more accurate, faster and more stable modern alternative to the DHT11/DHT22; used in weather stations, HVAC and comfort monitoring. Its standard I²C output is easier to read than the DHT's proprietary single-wire protocol. The AHT20 is the improved version of the AHT10.
The AHT20 is a humidity/temperature sensor that measures both temperature and humidity on one chip over I²C. It is a more accurate, faster and more stable modern alternative to the DHT11/DHT22. For the concept, see what is a humidity sensor.
What is the AHT20 used for?
Ambient humidity and temperature measurement, weather stations, HVAC, greenhouses and comfort monitoring. Its digital I²C output is easier and more reliable to read than the DHT's proprietary single-wire protocol.
Specifications
| Parameter | Value |
|---|---|
| Measurement | Relative humidity + temperature |
| Interface | I²C |
| Supply | 2.2 – 5.5 V |
| Highlight | More accurate/stable than the DHT |
Watch out
Humidity sensors are sensitive to condensation, dust and chemicals; for long life protect them from direct water/condensation. The AHT20 is the improved version of the AHT10. Its I²C address is fixed (use a single AHT20 or add an I²C multiplexer).
Equivalents
- SHT31: higher-accuracy humidity+temperature.
- BME280: humidity+temperature+pressure together.
- DHT22: older, single-wire protocol.
Find it in our catalog
Use the AHT20 search.