esphome-docs/components/binary_sensor/cap1188.rst

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CAP1188 Capacitive Touch Sensor
===============================
.. seo::
:description: Instructions for setting up CAP1188 Capacitive Touch Sensor
:image: cap1188.jpg
:keywords: CAP1188
.. _cap1188-component:
Component/Hub
-------------
The ``cap1188`` sensor platform allows you to use your CAP1188
(`datasheet <https://cdn-shop.adafruit.com/datasheets/CAP1188.pdf>`__,
`Adafruit`_) Capacitive Touch Sensor with ESPHome. The :ref:`I²C <i2c>` bus is
required to be set up in your configuration for this sensor to work.
.. figure:: images/cap1188-full.jpg
:align: center
:width: 75%
CAP1188 Capacitive Touch Sensor. Image by `Adafruit`_.
.. _Adafruit: https://learn.adafruit.com/adafruit-cap1188-breakout/overview
.. code-block:: yaml
# Example configuration entry
cap1188:
id: cap1188_component
address: 0x29
reset_pin: 14
touch_threshold: 0x40
allow_multiple_touches: 0x80
binary_sensor:
- platform: cap1188
id: touch_key0
channel: 0
name: "Touch Key 0"
Configuration variables:
------------------------
The configuration is made up of two parts: The central component, and individual Binary sensors per channel.
- **address** (*Optional*, integer): The I²C address of the sensor. Defaults to ``0x29``.
- **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor.
- **reset_pin** (*Optional*, :ref:`config-pin`): Set the pin that is used to reset the CAP1188 board on boot.
- **touch_threshold** (*Optional*, integer): The touch threshold for all channels. This defines the sensitivity for touch detection.
- ``0x00``: Maximum sensitivity - Most sensitive to touch
- ``0x20``: Default sensitivity
- ``0x40``: Medium sensitivity (I used this sensitivity when being used through a 3mm sheet of plastic)
- ``0x80``: Minimum sensitivity - Least sensitive to touch
- **allow_multiple_touches** (*Optional*, boolean): Whether to allow multitouch. Defaults to off.
Binary Sensor
-------------
The ``cap1188`` binary sensor allows you to use your CAP1188 with ESPHome.
First, setup a :ref:`cap1188-component` and then use this binary sensor platform to create individual
binary sensors for each touch sensor.
Configuration variables:
- **name** (*Optional*, string): The name for the binary sensor.
- **cap1188_id** (*Optional*, :ref:`config-id`): The ID of the CAP1188 defined above. Useful for multiple CAP1188's on the I²C bus.
- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
- **channel** (**Required**, integer): The channel number the CAP1188 the touchkey is connected to.
- All other options from :ref:`Binary Sensor <config-binary_sensor>`.
.. note::
SPI is not currently supported. I²C must be used at this time.
See Also
--------
- :ref:`sensor-filters`
- :apiref:`cap1188/cap1188.h`
- `Adafruit CAP1188 Library <https://github.com/adafruit/Adafruit_CAP1188_Library>`__ by `Adafruit <https://www.adafruit.com/>`__
- :ghedit:`Edit`