90 lines
3.3 KiB
ReStructuredText
90 lines
3.3 KiB
ReStructuredText
Slow PWM Output
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===============
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.. seo::
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:description: Instructions for setting up slow pwm outputs for GPIO pins.
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:image: pwm.png
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Similar to PWM, the Slow PWM Output platform allows you to control GPIO pins by
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pulsing them on/off over a longer time period. It could be used to control a
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heating element through a relay where a fast PWM update cycle would not be appropriate.
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.. note::
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This is for **slow** PWM output. For fast-switching PWM outputs (for example,
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lights), see these outputs:
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- ESP32: :doc:`ledc`
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- ESP8266: :doc:`esp8266_pwm`
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.. code-block:: yaml
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# Example configuration entry
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output:
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- platform: slow_pwm
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pin: D1
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id: my_slow_pwm
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period: 15s
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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 output component.
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- **period** (**Required**, :ref:`config-time`): The duration of each cycle. (i.e. a 10s
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period at 50% duty would result in the pin being turned on for 5s, then off for 5s)
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- **pin** (*Optional*, :ref:`Pin Schema <config-pin_schema>`): The pin to pulse.
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- **state_change_action** (*Optional*, :ref:`Automation <automation>`): An automation to perform when the load is switched. If a lambda is used the boolean ``state`` parameter holds the new status.
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- **turn_on_action** (*Optional*, :ref:`Automation <automation>`): An automation to perform when the load is turned on. Can be used to control for example a switch or output component.
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- **turn_off_action** (*Optional*, :ref:`Automation <automation>`): An automation to perform when the load is turned off. ``turn_on_action`` and ``turn_off_action`` must be configured together.
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- **restart_cycle_on_state_change** (*Optional*, boolean): Restart a timer of a cycle
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when new state is set. Defaults to ``false``.
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- All other options from :ref:`Output <config-output>`.
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.. note::
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- If ``pin`` is defined the GPIO pin state is writen before any action is executed.
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- ``state_change_action`` and ``turn_on_action``/``turn_off_action`` can be used togther. ``state_change_action`` is called before ``turn_on_action``/``turn_off_action``. It's recommended to use either ``state_change_action`` or ``turn_on_action``/``turn_off_action`` to change the state of an output. Using both automations together is only recommended for monitoring.
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Example:
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--------
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.. code-block:: yaml
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output:
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- platform: slow_pwm
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id: my_slow_pwm
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period: 15s
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turn_on_action:
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- lambda: |-
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auto *out1 = id(output1);
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out1->turn_on();
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turn_off_action:
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- output.turn_off: output1
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.. note::
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If the duty cycle is not constrained to a maximum value, the
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:doc:`/components/output/sigma_delta_output` component offers faster updates and
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greater control over the switching frequency. This is better for loads that
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need some time to fully change between on and off, like eletric thermal
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actuator heads or fans.
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See Also
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--------
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- :doc:`/components/output/index`
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- :doc:`/components/output/esp8266_pwm`
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- :doc:`/components/output/ledc`
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- :doc:`/components/output/sigma_delta_output`
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- :doc:`/components/light/monochromatic`
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- :doc:`/components/fan/speed`
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- :doc:`/components/power_supply`
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- :apiref:`slow_pwm/slow_pwm_output.h`
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- :ghedit:`Edit`
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