This library is no longer supported. New library here - https://github.com/enjoyneering/AHTxx

Aosong ASAIR AHT10, AHT15 & AHT20

This is an Arduino library for Aosong ASAIR AHT10, AHT15 & AHT20 Digital Humidity & Temperature Sensor

• Supply voltage: 1.8v - 3.6v for AHT10, AHT15 & 2.0v - 5.5v for AHT20
• Temperature range: -40°C..+85°C
• Temperature resolution: 0.01°C
• Temperature accuracy: ±0.3°C
• Relative humidity range: 0%..100%
• Relative humidity resolution: 0.024%
• Relative humidity accuracy: ±2%**
• I²C bus speed: 0Hz - 400KHz
• Recomended polling frequency: 8sec - 30sec***

Supports all sensors features:

• read humidity****
• read temperature****
• soft reset with sensor initialization

Tested on:

• Arduino AVR
• Arduino ESP8266
• Arduino ESP32
• Arduino STM32

**Prolonged exposure for 60 hours at humidity > 80% can lead to a temporary drift of the signal +3%. Sensor slowly returns to the calibrated state at normal operating conditions.

***If sampling rate of the measurement is too high, the sensor overheats. To prevent the temperature of the sensor from rising > 0.1°C, read sensor once every 2 seconds.

****The library returns 255 if a communication error occurs or if the calibration coefficient is off.