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⟩.