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HYTHYGTEMP(4)                Device Drivers 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 <kardel@NetBSD.org> and
     Frank Wille <phx@NetBSD.org>.

NetBSD 10.99                   September 9, 2015                  NetBSD 10.99