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- .. include:: <isonum.txt>
- ============
- Introduction
- ============
- 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
- :doc:`input <../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. :doc:`Input <../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.
- Devices that fall into this category include:
- * analog to digital converters (ADCs)
- * accelerometers
- * capacitance to digital converters (CDCs)
- * digital to analog converters (DACs)
- * gyroscopes
- * inertial measurement units (IMUs)
- * color and light sensors
- * magnetometers
- * pressure sensors
- * proximity sensors
- * temperature sensors
- Usually these sensors are connected via :doc:`SPI <../spi>` or
- :doc:`I2C <../i2c>`. A common use case of the sensors devices is to have
- combined functionality (e.g. light plus proximity sensor).
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