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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Chapter 1. Introduction</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Industrial I/O driver developer's guide"><link rel="up" href="index.html" title="Industrial I/O driver developer's guide"><link rel="prev" href="index.html" title="Industrial I/O driver developer's guide"><link rel="next" href="iiosubsys.html" title="Chapter 2. Industrial I/O core"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 1. Introduction</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="index.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="iiosubsys.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="intro"></a>Chapter 1. Introduction</h1></div></div></div><p>
The main purpose of the Industrial I/O subsystem (IIO) is to provide
support for devices that in some sense perform either analog-to-digital
conversion (ADC) or digital-to-analog conversion (DAC) or both. The aim
is to fill the gap between the somewhat similar hwmon and input
subsystems.
Hwmon is directed at low sample rate sensors used to monitor and
control the system itself, like fan speed control or temperature
measurement. Input is, as its name suggests, focused on human interaction
input devices (keyboard, mouse, touchscreen). In some cases there is
considerable overlap between these and IIO.
</p><p>
Devices that fall into this category include:
</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
analog to digital converters (ADCs)
</li><li class="listitem">
accelerometers
</li><li class="listitem">
capacitance to digital converters (CDCs)
</li><li class="listitem">
digital to analog converters (DACs)
</li><li class="listitem">
gyroscopes
</li><li class="listitem">
inertial measurement units (IMUs)
</li><li class="listitem">
color and light sensors
</li><li class="listitem">
magnetometers
</li><li class="listitem">
pressure sensors
</li><li class="listitem">
proximity sensors
</li><li class="listitem">
temperature sensors
</li></ul></div><p>
Usually these sensors are connected via SPI or I2C. A common use case of the
sensors devices is to have combined functionality (e.g. light plus proximity
sensor).
</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="index.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="iiosubsys.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Industrial I/O driver developer's guide </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 2. Industrial I/O core</td></tr></table></div></body></html>