---
layout: page
title: "KNX Binary Sensor"
description: "Instructions how to setup the KNX binary sensors within Home Assistant."
date: 2016-07-13 07:00
sidebar: true
comments: false
sharing: true
footer: true
logo: knx.png
ha_category: Binary Sensor
ha_release: 0.24
ha_iot_class: "Local Polling"
---

The `knx` sensor platform allows you to monitor [KNX](http://www.knx.org) binary sensors.

The `knx` component must be configured correctly, see [KNX Component](/components/knx).

```yaml
binary_sensor:
    - platform: knx
      name: "Entrance.Motion.Sensor"
      address: '6/0/2'
      device_class: 'motion'
      #significant_bit: 2
```

* **name** (*Optional*): A name for this device used within Home Assistant.
* **address**: KNX group address of the binary sensor
* **device_class**: (Optional) HASS device class e.g. "motion"
* **significant_bit**: (Optional) Specify which significant bit of the KNX value should be used. Default is 1.

You can also attach actions to binary sensors (e.g., to switch on a light when a switch was pressed). In this example, one light is switched on when the button was pressed once and two others when the button was pressed a second time.

```yaml
binary_sensor:
    - platform: knx
      name: Livingroom.3Switch3
      address: '5/0/26'
      automation:
        - counter: 1
          hook: 'on'
          action:
            - entity_id: light.hue_color_lamp_1
              service: homeassistant.turn_on
        - counter: 2
          hook: 'on'
          action:
            - entity_id: light.hue_bloom_1
              service: homeassistant.turn_on
            - entity_id: light.hue_bloom_2
              service: homeassistant.turn_on
```

- **name** (*Optional*): A name for this device used within Home Assistant.
- **counter**: (*Optional*) Set to 2 if your only want the action to be executed if the button was pressed twice. To 3 for three times button pressed. Defaults to 1.
- **hook**: (Optional): Indicates if the automation should be executed on what state of the binary sensor. Values: "on" or "off". Defaults to "on".
- **action**: Specify a list of actions analog to the [HASS automation rules](https://home-assistant.io/docs/automation/action/).

