mirror of
https://github.com/esphome/esphome-docs.git
synced 2024-11-08 09:52:07 +01:00
67 lines
2.4 KiB
ReStructuredText
67 lines
2.4 KiB
ReStructuredText
|
SN74HC165 I/O Expander (shift register)
|
||
|
|
=======================================
|
||
|
|
|
||
|
|
.. seo::
|
||
|
|
:description: Instructions for setting up SN74HC165 shift registers as digital port expanders in ESPHome.
|
||
|
|
|
||
|
|
The SN74HC165 component allows you to use SN74HC165 shift registers as I/O expanders (Input only, use SN74HC595 for outputs)
|
||
|
|
(`datasheet <https://www.ti.com/lit/ds/symlink/sn74hc165.pdf>`__) in ESPHome. It uses 3 wires (optionally 4) for communication.
|
||
|
|
|
||
|
|
Once configured, you can use any of the 8 pins for your projects. Up-to 256 shift registers can be daisy-chained
|
||
|
|
to provide more pins, without using more GPIO pins on the controller. They are linked by connecting pin Q of the closer
|
||
|
|
shift register to the pin QH of the next shift register.
|
||
|
|
|
||
|
|
|
||
|
|
.. code-block:: yaml
|
||
|
|
|
||
|
|
# Example configuration entry
|
||
|
|
sn74hc165:
|
||
|
|
- id: sn74hc165_hub
|
||
|
|
clock_pin: GPIO16
|
||
|
|
data_pin: GPIO17
|
||
|
|
load_pin: GPIO4
|
||
|
|
clock_inhibit_pin: GPIO18
|
||
|
|
sr_count: 2
|
||
|
|
|
||
|
|
# Individual inputs
|
||
|
|
binary_sensor:
|
||
|
|
- platform: gpio
|
||
|
|
name: "SN74HC165 Pin #0"
|
||
|
|
pin:
|
||
|
|
sn74hc595: sn74hc165_hub
|
||
|
|
# Use pin number 0
|
||
|
|
number: 0
|
||
|
|
inverted: false
|
||
|
|
|
||
|
|
|
||
|
|
Configuration variables:
|
||
|
|
************************
|
||
|
|
|
||
|
|
- **id** (**Required**, :ref:`config-id`): The id to use for this SN74HC165 component.
|
||
|
|
- **data_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): Pin connected to SN74HC165 Serial Output (QH) input.
|
||
|
|
- **clock_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): Pin connected to SN74HC165 Clock (CLK) pin
|
||
|
|
- **load_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): Pin connected to SN74HC165 Load input (SH/LD) pin
|
||
|
|
- **clock_inhibit_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): Pin connected to SN74HC165 Clock Inhibit (CLK INH) pin
|
||
|
|
- **sr_count** (*Optional*, int): Number of daisy-chained shift registers, up-to 256. Defaults to ``1``.
|
||
|
|
|
||
|
|
|
||
|
|
Pin configuration variables:
|
||
|
|
****************************
|
||
|
|
|
||
|
|
- **SN74HC165** (**Required**, :ref:`config-id`): The id of the SN74HC165 component of the pin.
|
||
|
|
- **number** (**Required**, int): The pin number.
|
||
|
|
- **inverted** (*Optional*, boolean): If received value should be treated as inverted.
|
||
|
|
Defaults to ``false``.
|
||
|
|
|
||
|
|
.. note::
|
||
|
|
|
||
|
|
Pin number 0 is Pin A on the SN74HC165 that is furthest away from the microcontroller.
|
||
|
|
|
||
|
|
See Also
|
||
|
|
--------
|
||
|
|
|
||
|
|
|
||
|
|
- :doc:`binary_sensor/gpio`
|
||
|
|
- :apiref:`SN74HC165/SN74HC165.h`
|
||
|
|
- :ghedit:`Edit`
|