aht20temp
—
Driver for Guangzhou Aosong AHT20 sensor chip via I2C bus
aht20temp* at iic? addr 0x38
The aht20temp
driver provides measurements from the
AHT20 humidity/temperature sensors via the
envsys(4) framework. The
aht20temp
addr argument selects
the address at the iic(4) bus. The
crc validity can be changed through
sysctl(8) nodes.
The following sysctl(3) variables
are provided:
hw.aht20temp0.ignorecrc
- If set, the crc calculation for %RH and temperature will be ignored.
hw.aht20temp0.debug
- If the driver is compiled with
AHT20_DEBUG
, this
node will appear and can be used to set the debugging level.
hw.aht20temp0.readattempts
- To read %RH or temperature the chip requires that the command be sent,
then a delay must be observed before a read can be done to get the values
back. The delays are documented in the datasheet for the chip. The driver
will attempt to read back the values readattempts number of times. The
default is 10 which should be more than enough for most purposes.
The aht20temp
driver first appeared in
NetBSD 10.0.