1 .. include:: <isonum.txt> 1 .. include:: <isonum.txt>
2 2
3 ============ 3 ============
4 Introduction 4 Introduction
5 ============ 5 ============
6 6
7 The main purpose of the Industrial I/O subsyst 7 The main purpose of the Industrial I/O subsystem (IIO) is to provide support
8 for devices that in some sense perform either 8 for devices that in some sense perform either
9 analog-to-digital conversion (ADC) or digital- 9 analog-to-digital conversion (ADC) or digital-to-analog conversion (DAC)
10 or both. The aim is to fill the gap between th 10 or both. The aim is to fill the gap between the somewhat similar hwmon and
11 :doc:`input <../input>` subsystems. Hwmon is d 11 :doc:`input <../input>` subsystems. Hwmon is directed at low sample rate
12 sensors used to monitor and control the system 12 sensors used to monitor and control the system itself, like fan speed control
13 or temperature measurement. :doc:`Input <../in 13 or temperature measurement. :doc:`Input <../input>` is, as its name suggests,
14 focused on human interaction input devices (ke 14 focused on human interaction input devices (keyboard, mouse, touchscreen).
15 In some cases there is considerable overlap be 15 In some cases there is considerable overlap between these and IIO.
16 16
17 Devices that fall into this category include: 17 Devices that fall into this category include:
18 18
19 * analog to digital converters (ADCs) 19 * analog to digital converters (ADCs)
20 * accelerometers 20 * accelerometers
21 * capacitance to digital converters (CDCs) 21 * capacitance to digital converters (CDCs)
22 * digital to analog converters (DACs) 22 * digital to analog converters (DACs)
23 * gyroscopes 23 * gyroscopes
24 * inertial measurement units (IMUs) 24 * inertial measurement units (IMUs)
25 * color and light sensors 25 * color and light sensors
26 * magnetometers 26 * magnetometers
27 * pressure sensors 27 * pressure sensors
28 * proximity sensors 28 * proximity sensors
29 * temperature sensors 29 * temperature sensors
30 30
31 Usually these sensors are connected via :doc:` 31 Usually these sensors are connected via :doc:`SPI <../spi>` or
32 :doc:`I2C <../i2c>`. A common use case of the 32 :doc:`I2C <../i2c>`. A common use case of the sensors devices is to have
33 combined functionality (e.g. light plus proxim 33 combined functionality (e.g. light plus proximity sensor).
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