ESP8266 Software PWM Output
===========================

.. seo::
    :description: Instructions for setting up ESP8266 software-based PWMs.
    :image: pwm.png

The ESP8266 Software PWM platform allows you to use a software PWM on
the pins GPIO0-GPIO16 on your ESP8266. Note that this is a software PWM,
so there can be some flickering during periods of high WiFi activity. Hardware PWMs
like the one on the ESP32 (see :doc:`ledc`) are preferred.

.. code-block:: yaml

    # Example configuration entry
    output:
      - platform: esp8266_pwm
        pin: D1
        frequency: 1000 Hz
        id: pwm_output

    # Example usage in a light
    light:
      - platform: monochromatic
        output: pwm_output
        name: "Kitchen Light"

Configuration variables:
------------------------

- **pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The pin to use PWM on.
- **id** (**Required**, :ref:`config-id`): The id to use for this output component.
- **frequency** (*Optional*, frequency): The frequency to run the PWM with. Lower frequencies
  have more visual artifacts, but can represent much more colors. Defaults to ``1000 Hz``.
- All other options from :ref:`Output <config-output>`.

.. note::

    If you previously had Tasmota installed on your device and have just flashed ESPHome onto it,
    you may encounter an issue where the PWM output is only fully on or off.

    A hard reset fixes the problem - if you have this issue please power cycle the device, that
    should fix it.

.. _output-esp8266_pwm-set_frequency_action:

``output.esp8266_pwm.set_frequency`` Action
-------------------------------------------

This :ref:`Action <config-action>` allows you to manually change the frequency of an ESP8266 PWM
channel at runtime. Use cases include controlling a passive buzzer (for pitch control).

.. code-block:: yaml

    on_...:
      - output.esp8266_pwm.set_frequency:
          id: pwm_output
          frequency: 100Hz

Configuration variables:

- **id** (**Required**, :ref:`config-id`): The ID of the PWM output to change.
- **frequency** (**Required**, :ref:`templatable <config-templatable>`, float): The frequency
  to set in hertz.

See Also
--------

- :doc:`/components/output/index`
- :doc:`/components/output/ledc`
- :doc:`/components/light/monochromatic`
- :doc:`/components/fan/speed`
- :doc:`/components/power_supply`
- :apiref:`esp8266_pwm/esp8266_pwm.h`
- :ghedit:`Edit`
