hythygtemp —
Driver for IST-AG HYT-221/271/939 sensor chip via I2C bus
hythygtemp* at iic? addr 0x28
The hythygtemp driver provides measurements from the
HYT-221/271/939 humidity/temperature sensors via the
envsys(4) framework. The
hythygtemp addr argument selects
the address at the iic(4) bus. The
sampling interval can be changed through the
sysctl(8) node
hw.hythygtemp0.interval.
The sensor chips can be reconfigured to respond to other addresses
than the default value of 0x28 by external utilities, like for example the
pkgsrc/sysutils/hytctl package.
The following sysctl(3) variables
are provided:
- hw.hythygtemp0.interval
- Defines the sensor's sampling interval in seconds. It defaults to 50
seconds.
The hythygtemp driver first appeared in
NetBSD 7.0.
The hythygtemp driver was written by
Frank Kardel
<kardel@NetBSD.org>
and Frank Wille ⟨phx@NetBSD.org⟩.