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