| .. 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). |