Update documentation for 0.9

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Paulus Schoutsen 2015-12-06 13:31:17 -08:00
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Binary sensors are gathering information about state of switches, contacts, pins, and alike. The return value of those sensors is usually digital (1/0). This means that those sensors knows only two states: **off/low/open*** and ***on/high/closed**.
Binary sensors are gathering information about state of switches, contacts, pins, and alike. The return value of those sensors is usually digital (1/0). This means that those sensors knows only two states: **off/low/open** and **on/high/closed**.
Knowing that there are only two states allows Home Assistant to represent the sensor better in the frontend.
For analog sensors please check the [component overview](https://home-assistant.io/components/#sensor).