1<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>
2      The main purpose of the Industrial I/O subsystem (IIO) is to provide
3      support for devices that in some sense perform either analog-to-digital
4      conversion (ADC) or digital-to-analog conversion (DAC) or both. The aim
5      is to fill the gap between the somewhat similar hwmon and input
6      subsystems.
7      Hwmon is directed at low sample rate sensors used to monitor and
8      control the system itself, like fan speed control or temperature
9      measurement. Input is, as its name suggests, focused on human interaction
10      input devices (keyboard, mouse, touchscreen). In some cases there is
11      considerable overlap between these and IIO.
12  </p><p>
13    Devices that fall into this category include:
14    </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
15        analog to digital converters (ADCs)
16      </li><li class="listitem">
17        accelerometers
18      </li><li class="listitem">
19        capacitance to digital converters (CDCs)
20      </li><li class="listitem">
21        digital to analog converters (DACs)
22      </li><li class="listitem">
23        gyroscopes
24      </li><li class="listitem">
25        inertial measurement units (IMUs)
26      </li><li class="listitem">
27        color and light sensors
28      </li><li class="listitem">
29        magnetometers
30      </li><li class="listitem">
31        pressure sensors
32      </li><li class="listitem">
33        proximity sensors
34      </li><li class="listitem">
35        temperature sensors
36      </li></ul></div><p>
37    Usually these sensors are connected via SPI or I2C. A common use case of the
38    sensors devices is to have combined functionality (e.g. light plus proximity
39    sensor).
40  </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>
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