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115 lines
3.7 KiB
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115 lines
3.7 KiB
ReStructuredText
BLE iTag Button
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===============
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.. seo::
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:description: Receive events from a cheap BLE keyring button.
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:image: bluetooth.svg
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This example shows how to use a cheap BLE keyring tag to trigger arbitrary
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events. An ESP32 is used, which provides a BLE peripheral.
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.. figure:: images/esp32_ble_itag.png
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:align: center
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:width: 40%
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These tags can be had for a couple of dollars each and run for several months
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on a coin cell. Using the BLE features of ESPHome, you can use these as small
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and cheap remotes to control any automation.
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Quickstart
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----------
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Use the configuration block below for a basic setup which will provide a
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binary_sensor that is momentarily turned on when the button is pressed.
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You will need to find the MAC address of your tag. See the documentation
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for :doc:`/components/ble_client` for how to find this out. You may also
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wish to change the name and id fields where appropriate to suit your
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device(s).
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Note that a maximum of three devices are supported due to limitations in
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the ESP32's BLE stack.
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Configuration example:
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------------------------
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.. code-block:: yaml
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esp32_ble_tracker:
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ble_client:
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# Replace with the MAC address of your device.
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- mac_address: FF:FF:20:00:0F:15
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id: itag_black
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binary_sensor:
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- platform: template
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id: black_button
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name: "Black iTag Button"
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filters:
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delayed_off: 200ms
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sensor:
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# This entry registers and awaits notifications for the
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# characteristic that signals button presses. Each time
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# a notification is received, the corresponding binary_sensor
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# is briefly toggled.
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- platform: ble_client
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ble_client_id: itag_black
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name: "Black iTag btn"
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service_uuid: 'ffe0'
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char_uuid: 'ffe1'
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notify: true
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update_interval: never
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on_notify:
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then:
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- binary_sensor.template.publish:
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id: black_button
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state: ON
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- binary_sensor.template.publish:
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id: black_button
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state: OFF
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# This entry queries the battery level. Some tags may not
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# support this characteristic, you will see 'Unknown' in the
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# HA frontent.
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- platform: ble_client
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ble_client_id: itag_black
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name: "Black iTag Battery"
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service_uuid: '180f'
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char_uuid: '2a19'
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icon: 'mdi:battery'
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unit_of_measurement: '%'
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Explanation
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-----------
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The first thing enabled is the ``esp32_ble_tracker`` component. This sets up
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the BLE stack on the device and listens for available devices.
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Next, the ``ble_client`` component will listen to devices discovered by
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the tracker, and establish a connection to the given device when it is
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available.
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The ``binary_sensor`` provides a template sensor which will export to the
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HA frontend the sensor that's switched by the BLE tag's button.
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The first entry in the ``sensor`` component is used to configure the specific
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Service and Characteristic UUIDs for an iTag's button. It also enables BLE
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notifications and sets up an automation to toggle the ``binary_sensor`` when
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a notification is received from the tag. Automatic updates are disabled, there
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is no point querying the tag for the device state, as we will be immediately
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notified when the button is pressed.
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The next ``sensor`` entry listens for a well-known Service and Chacteristic
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that is used by many BLE devices to give battery level information. This sensor
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will be exposed in the HA frontend to determine the state of the tag's battery.
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Note that many tags will not provide this service, so you will not see a valid
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value. If not, you can remove this from the config.
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See Also
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--------
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- :doc:`/components/ble_client`
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- :doc:`/components/sensor/ble_sensor`
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- :ghedit:`Edit`
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