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Clarify device

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Paulus Schoutsen 2019-02-21 17:25:59 -08:00
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docs/device_registry_index.md
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@ -10,6 +10,16 @@ The device registry is a registry where Home Assistant keeps track of devices. A
alt='Device registry overview'
/>
## What is a device?
A device in Home Assistant represents a physical device that has its own control unit. The control unit itself does not have to be smart, but it should be in control of what happens. For example, an Ecobee thermostat with 4 sensors equals 5 devices in Home Assistant, one for the thermostat and one for each sensor.
If you connect a sensor to another device to read some of its data, it should still be represented as two different devices. The reason for this is that the sensor could be moved to read the data of another device.
> Although not currently available, we could consider offering an option to users to merge devices.
## Device properties
| Attribute | Description |
| --------- | ----------- |
| id | Unique ID of device (generated by Home Assistant)