mirror of
https://github.com/esphome/esphome-docs.git
synced 2024-07-01 11:25:08 +02:00
42 lines
1.3 KiB
ReStructuredText
42 lines
1.3 KiB
ReStructuredText
.. _i2c:
|
|
|
|
I²C Bus
|
|
=======
|
|
|
|
.. seo::
|
|
:description: Instructions for setting up the I²C bus to communicate with 2-wire devices in ESPHome
|
|
:image: i2c.png
|
|
:keywords: i2c, iic, bus
|
|
|
|
This component sets up the I²C bus for your ESP32 or ESP8266. In order for those components
|
|
to work correctly, you need to define the I²C bus in your configuration. Please note the ESP
|
|
will enable its internal 10kΩ pullup resistors for these pins, so you usually don't need to
|
|
put on external ones.
|
|
|
|
.. code-block:: yaml
|
|
|
|
# Example configuration entry
|
|
i2c:
|
|
sda: 21
|
|
scl: 22
|
|
scan: True
|
|
|
|
Configuration variables:
|
|
------------------------
|
|
|
|
- **sda** (*Optional*, :ref:`config-pin`): The pin for the data line of the I²C bus.
|
|
Defaults to the default of your board (usually GPIO21 for ESP32 and GPIO4 for ESP8266).
|
|
- **scl** (*Optional*, :ref:`config-pin`): The pin for the clock line of the I²C bus.
|
|
Defaults to the default of your board (usually GPIO22 for ESP32 and
|
|
GPIO5 for ESP8266).
|
|
- **scan** (*Optional*, boolean): If ESPHome should do a search of the I²C address space on startup.
|
|
Defaults to ``True``.
|
|
- **frequency** (*Optional*, float): Set the frequency the I²C bus should operate on.
|
|
Defaults to ``50kHz``. Values are ``50kHz``, ``100kHz``, ``200kHz``, ... ``800kHz``
|
|
|
|
See Also
|
|
--------
|
|
|
|
- :apiref:`i2c_component.h`
|
|
- :ghedit:`Edit`
|