$NetBSD: hythygtemp.4,v 1.4 2015/09/09 17:42:35 wiz Exp $
Copyright (c) 2014 Frank Kardel
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd September 9, 2015 .Dt HYTHYGTEMP 4 .Os .Sh NAME .Nm hythygtemp .Nd Driver for IST-AG HYT-221/271/939 sensor chip via I2C bus .Sh SYNOPSIS .Cd "hythygtemp* at iic? addr 0x28" .Sh DESCRIPTION The .Nm driver provides measurements from the HYT-221/271/939 humidity/temperature sensors via the .Xr envsys 4 framework. The .Nm .Ar addr argument selects the address at the .Xr iic 4 bus. The sampling interval can be changed through the .Xr sysctl 8 node .Li hw.hythygtemp0.interval .
Copyright (c) 2014 Frank Kardel
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd September 9, 2015 .Dt HYTHYGTEMP 4 .Os .Sh NAME .Nm hythygtemp .Nd Driver for IST-AG HYT-221/271/939 sensor chip via I2C bus .Sh SYNOPSIS .Cd "hythygtemp* at iic? addr 0x28" .Sh DESCRIPTION The .Nm driver provides measurements from the HYT-221/271/939 humidity/temperature sensors via the .Xr envsys 4 framework. The .Nm .Ar addr argument selects the address at the .Xr iic 4 bus. The sampling interval can be changed through the .Xr sysctl 8 node .Li hw.hythygtemp0.interval .
p The sensor chips can be reconfigured to respond to other addresses than the default value of 0x28 by external utilities, like for example the
a pkgsrc/sysutils/hytctl package. .Sh SYSCTL VARIABLES The following .Xr sysctl 3 variables are provided: l -tag -width indent t hw.hythygtemp0.interval Defines the sensor's sampling interval in seconds. It defaults to 50 seconds. .El .Sh SEE ALSO .Xr envsys 4 , .Xr iic 4 , .Xr envstat 8 , .Xr sysctl 8 .Sh HISTORY The .Nm driver first appeared in .Nx 7.0 . .Sh AUTHORS .An -nosplit The .Nm driver was written by .An Frank Kardel Aq Mt kardel (at] NetBSD.org and .An Frank Wille Aq phx (at] NetBSD.org .
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