HYTHYGTEMP(4) |
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.
HISTORY
The hythygtemp driver first appeared in NetBSD 7.0.
AUTHORS
The
hythygtemp driver was written by
Frank Kardel <
kardel@NetBSD.org> and
Frank Wille <phx@NetBSD.org>.