esphome-docs/api/misc/pcf8574.rst
2018-05-14 21:15:49 +02:00

45 lines
1.2 KiB
ReStructuredText

PCF8574 I/O Expander
====================
The PCF8574 component allows you to use PCF8574 and PCF8575 I/O port expanders with many of
esphomelib's components. With most components, you are able to specify GPIOOutputPin or
GPIOInputPin for internal pins. The PCF8574 component subclasses those types.
Example Usage
-------------
.. code-block:: cpp
auto *pcf8574 = App.make_pcf8574_component(0x21);
App.make_gpio_binary_sensor("PCF pin 0 sensor", pcf8574->make_input_pin(0, PCF8574_INPUT));
App.make_gpio_binary_sensor("PCF pin 0 sensor", 0);
App.make_gpio_switch("PCF pin 1 switch", pcf8574->make_output_pin(1));
auto *out = App.make_gpio_output(pcf8574->make_output_pin(2));
App.make_binary_light("PCF pin 2 light", out);
.. cpp:namespace:: nullptr
See :cpp:func:`Application::make_pcf8574_component`.
API Reference
-------------
.. cpp:namespace:: nullptr
.. doxygenenum:: PCF8574GPIOMode
.. doxygenclass:: io::PCF8574Component
:members:
:protected-members:
:undoc-members:
.. doxygenclass:: io::PCF8574GPIOInputPin
:members:
:protected-members:
:undoc-members:
.. doxygenclass:: io::PCF8574GPIOOutputPin
:members:
:protected-members:
:undoc-members: