hythygtemp(4) - NetBSD Manual Pages

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HYTHYGTEMP(4)           NetBSD 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 inter-
     val 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 8.3                     September 9, 2015                    NetBSD 8.3