.. SPDX-License-Identifier: GPL-2.0

Kernel driver aht10
=====================

Supported chips:

  * Aosong AHT10/AHT20

    Prefix: 'aht10'

    Addresses scanned: None

    Datasheet(AHT10):

      Chinese: http://www.aosong.com/userfiles/files/media/AHT10%E4%BA%A7%E5%93%81%E6%89%8B%E5%86%8C%20A3%2020201210.pdf
      English: https://server4.eca.ir/eshop/AHT10/Aosong_AHT10_en_draft_0c.pdf

    Datasheet(AHT20):

      English: http://www.aosong.com/userfiles/files/media/Data%20Sheet%20AHT20.pdf

  * Aosong DHT20

    Prefix: 'dht20'

    Addresses scanned: None

    Datasheet: https://www.digikey.co.nz/en/htmldatasheets/production/9184855/0/0/1/101020932

Author: Johannes Cornelis Draaijer <jcdra1@gmail.com>


Description
-----------

The AHT10/AHT20 is a Temperature and Humidity sensor

The address of this i2c device may only be 0x38

Special Features
----------------

AHT20, DHT20 has additional CRC8 support which is sent as the last byte of the sensor
values.

Usage Notes
-----------

This driver does not probe for AHT10/ATH20 devices, as there is no reliable
way to determine if an i2c chip is or isn't an AHT10/AHT20. The device has
to be instantiated explicitly with the address 0x38. See
Documentation/i2c/instantiating-devices.rst for details.

Sysfs entries
-------------

=============== ============================================
temp1_input     Measured temperature in millidegrees Celsius
humidity1_input Measured humidity in %H
update_interval The minimum interval for polling the sensor,
                in milliseconds. Writable. Must be at
                least 2000.
=============== ============================================
