Binary Sensor

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.

Most binary sensors support the SENSOR_CLASSES which let you specify the type of your sensor. The following types are supported:

• None: Generic on/off
• opening: Door, window, etc
• motion: Motion sensor
• gas’: CO, CO2, etc
• smoke’: Smoke detector
• moisture: Specifically a wetness sensor
• light: Lightness threshold
• power: Power, over-current, etc
• safety: Generic on=unsafe, off=safe
• heat: On means hot (or too hot)
• cold: On means cold (or too cold)
• moving: On means moving, Off means stopped
• sound: On means sound detected, Off means no sound
• vibration: On means vibration detected, Off means no vibration

For analog sensors please check the component overview.