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