49 lines
1.6 KiB
ReStructuredText
49 lines
1.6 KiB
ReStructuredText
.. _i2c:
|
|
|
|
I²C Bus
|
|
=======
|
|
|
|
.. seo::
|
|
:description: Instructions for setting up the i2c bus to communicate with 2-wire devices in esphomelib
|
|
: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: False
|
|
|
|
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 esphomelib should do a search of the i2c address space on startup.
|
|
Note that this can slow down startup and is only recommended for when setting up new sensors. Defaults to
|
|
``False``.
|
|
- **frequency** (*Optional*, float): Set the frequency the i²c bus should operate on.
|
|
|
|
.. note::
|
|
|
|
If you're using the ESP32 and i2c frequently is showing errors in the logs, try with the latest
|
|
version of the Arduino framework. See :ref:`esphomeyaml-arduino_version` for information on how to do this.
|
|
|
|
See Also
|
|
--------
|
|
|
|
- :apiref:`i2c_component.h`
|
|
- :ghedit:`Edit`
|
|
|
|
.. disqus::
|