mirror of
https://github.com/esphome/esphome-docs.git
synced 2024-11-08 09:52:07 +01:00
115 lines
3.7 KiB
ReStructuredText
115 lines
3.7 KiB
ReStructuredText
BLE iTag Button
|
|
===============
|
|
|
|
.. seo::
|
|
:description: Receive events from a cheap BLE keyring button.
|
|
:image: bluetooth.svg
|
|
|
|
This example shows how to use a cheap BLE keyring tag to trigger arbitrary
|
|
events. An ESP32 is used, which provides a BLE peripheral.
|
|
|
|
.. figure:: images/esp32_ble_itag.png
|
|
:align: center
|
|
:width: 40%
|
|
|
|
These tags can be had for a couple of dollars each and run for several months
|
|
on a coin cell. Using the BLE features of ESPHome, you can use these as small
|
|
and cheap remotes to control any automation.
|
|
|
|
Quickstart
|
|
----------
|
|
|
|
Use the configuration block below for a basic setup which will provide a
|
|
binary_sensor that is momentarily turned on when the button is pressed.
|
|
|
|
You will need to find the MAC address of your tag. See the documentation
|
|
for :doc:`/components/ble_client` for how to find this out. You may also
|
|
wish to change the name and id fields where appropriate to suit your
|
|
device(s).
|
|
|
|
Note that a maximum of three devices are supported due to limitations in
|
|
the ESP32's BLE stack.
|
|
|
|
Configuration example:
|
|
------------------------
|
|
|
|
.. code-block:: yaml
|
|
|
|
esp32_ble_tracker:
|
|
|
|
ble_client:
|
|
# Replace with the MAC address of your device.
|
|
- mac_address: FF:FF:20:00:0F:15
|
|
id: itag_black
|
|
|
|
binary_sensor:
|
|
- platform: template
|
|
id: black_button
|
|
name: "Black iTag Button"
|
|
filters:
|
|
delayed_off: 200ms
|
|
|
|
sensor:
|
|
# This entry registers and awaits notifications for the
|
|
# characteristic that signals button presses. Each time
|
|
# a notification is received, the corresponding binary_sensor
|
|
# is briefly toggled.
|
|
- platform: ble_client
|
|
ble_client_id: itag_black
|
|
name: "Black iTag btn"
|
|
service_uuid: 'ffe0'
|
|
characteristic_uuid: 'ffe1'
|
|
notify: true
|
|
update_interval: never
|
|
on_notify:
|
|
then:
|
|
- binary_sensor.template.publish:
|
|
id: black_button
|
|
state: ON
|
|
- binary_sensor.template.publish:
|
|
id: black_button
|
|
state: OFF
|
|
# This entry queries the battery level. Some tags may not
|
|
# support this characteristic, you will see 'Unknown' in the
|
|
# HA frontend.
|
|
- platform: ble_client
|
|
ble_client_id: itag_black
|
|
name: "Black iTag Battery"
|
|
service_uuid: '180f'
|
|
characteristic_uuid: '2a19'
|
|
icon: 'mdi:battery'
|
|
unit_of_measurement: '%'
|
|
|
|
Explanation
|
|
-----------
|
|
|
|
The first thing enabled is the ``esp32_ble_tracker`` component. This sets up
|
|
the BLE stack on the device and listens for available devices.
|
|
|
|
Next, the ``ble_client`` component will listen to devices discovered by
|
|
the tracker, and establish a connection to the given device when it is
|
|
available.
|
|
|
|
The ``binary_sensor`` provides a template sensor which will export to the
|
|
HA frontend the sensor that's switched by the BLE tag's button.
|
|
|
|
The first entry in the ``sensor`` component is used to configure the specific
|
|
Service and Characteristic UUIDs for an iTag's button. It also enables BLE
|
|
notifications and sets up an automation to toggle the ``binary_sensor`` when
|
|
a notification is received from the tag. Automatic updates are disabled, there
|
|
is no point querying the tag for the device state, as we will be immediately
|
|
notified when the button is pressed.
|
|
|
|
The next ``sensor`` entry listens for a well-known Service and Chacteristic
|
|
that is used by many BLE devices to give battery level information. This sensor
|
|
will be exposed in the HA frontend to determine the state of the tag's battery.
|
|
Note that many tags will not provide this service, so you will not see a valid
|
|
value. If not, you can remove this from the config.
|
|
|
|
See Also
|
|
--------
|
|
|
|
- :doc:`/components/ble_client`
|
|
- :doc:`/components/sensor/ble_client`
|
|
- :ghedit:`Edit`
|