https://github.com/enjoyneering/AHTxx

This is an Arduino library for Aosong ASAIR AHT1x, AHT2x Digital Humidity & Temperature Sensor
https://github.com/enjoyneering/AHTxx

aht10 aht15 aht20 aht21 aht25 aosong arduino arduino-library asair humidity-sensor i2c-sensors temperature-sensor

Last synced: about 2 months ago
JSON representation

This is an Arduino library for Aosong ASAIR AHT1x, AHT2x Digital Humidity & Temperature Sensor

• Host: GitHub
• URL: https://github.com/enjoyneering/AHTxx
• Owner: enjoyneering
• Created: 2021-09-25T20:02:04.000Z (about 3 years ago)
• Default Branch: main
• Last Pushed: 2024-06-17T12:46:43.000Z (6 months ago)
• Last Synced: 2024-08-01T02:26:13.040Z (5 months ago)
• Topics: aht10, aht15, aht20, aht21, aht25, aosong, arduino, arduino-library, asair, humidity-sensor, i2c-sensors, temperature-sensor
• Language: C++
• Homepage:
• Size: 143 KB
• Stars: 92
• Watchers: 4
• Forks: 24
• Open Issues: 2
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

        
[![license-badge][]][license] ![version] [![stars][]][stargazers] ![hit-count] [![github-issues][]][issues]

# Aosong ASAIR AHT1x/AHT2x

This is an Arduino library for _Aosong ASAIR_ AHT10/AHT15/AHT20/AHT21/AHT25/AM2301**B**/AM2311**B** Digital Humidity & Temperature Sensor

- AHT1x +1.8v..+3.6v, AHT2x +2.2v..+5.5v

- AHT1x 0.25μA..320μA, AHT2x 0.25μA..980μA

- temperature range -40°C..+85°C

- humidity range 0%..100%

- typical accuracy T ±0.3°C, RH ±2% **(1)**

- typical resolution T 0.01°C, RH 0.024%

- normal operating range T -20°C..+60°C, RH 10%..80%

- maximum operating rage T -40°C..+80°C, RH 0%..100%

- I²C bus speed 100KHz..400KHz, 10KHz recommended minimum

- recommended measurement frequency 8sec..30sec **(2)**

- recommended to route VDD or GND between I²C lines to reduce crosstalk between SCL & SDA

- power supply pins must be decoupled with 100nF capacitor

Supports all sensors features:

- read humidity **(3)**

- read temperature **(3)**

- soft reset with sensor initialization

- CRC calculation for AHT2x **(3)**

Tested on:

- Arduino AVR

- Arduino ESP8266

- Arduino ESP32

- Arduino STM32

- Arduino SAMD21

**(1)** 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.


**(2)** High frequency measurement causes the sensor to heat up, the interval must be greater than 1 second to keep self-heating below 0.1°C.


**(3)** Library returns 255 if a communication error occurs, calibration coefficient is off or CRC doesn't match (for AHT2x only).

[license-badge]: https://img.shields.io/badge/License-GPLv3-blue.svg

[license]:       https://choosealicense.com/licenses/gpl-3.0/

[version]:       https://img.shields.io/badge/Version-1.2.0-green.svg

[stars]:         https://img.shields.io/github/stars/enjoyneering/AHTxx.svg

[stargazers]:    https://github.com/enjoyneering/AHTxx/stargazers

[hit-count]:     https://hits.seeyoufarm.com/api/count/incr/badge.svg?url=https%3A%2F%2Fgithub.com%2Fenjoyneering%2FAHTxx&count_bg=%2379C83D&title_bg=%23555555&icon=&icon_color=%23E7E7E7&title=hits&edge_flat=false

[github-issues]: https://img.shields.io/github/issues/enjoyneering/AHTxx.svg

[issues]:        https://github.com/enjoyneering/AHTxx/issues/