HYTHYGTEMP(4) FreeBSD Kernel Interfaces Manual HYTHYGTEMP(4)
NAME
hythygtemp - Driver for IST-AG HYT-221/271/939 sensor chip via I2C bus
SYNOPSIS
hythygtemp* at iic? addr 0x28
DESCRIPTION
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.
SYSCTL VARIABLES
The following sysctl(3) variables are provided:
hw.hythygtemp0.interval
Defines the sensor's sampling interval in seconds. It defaults
to 50 seconds.
SEE ALSO
envsys(4), iic(4), envstat(8), sysctl(8)
HISTORY
The hythygtemp driver first appeared in NetBSD 7.0.
AUTHORS
The hythygtemp driver was written by Frank Kardel <
[email protected]> and
Frank Wille <
[email protected]>.
FreeBSD 14.1-RELEASE-p8 September 9, 2015 FreeBSD 14.1-RELEASE-p8