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310 lines
9.6 KiB
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310 lines
9.6 KiB
ReStructuredText
Stepper Component
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=================
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.. seo::
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:description: Instructions for setting up stepper motor drivers in ESPHome
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:image: folder-open.png
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:keywords: stepper motor, stepper driver, a4988
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The ``stepper`` component allows you to use stepper motors with ESPHome.
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Currently only the A4988 stepper driver
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(`datasheet <https://www.pololu.com/file/0J450/a4988_DMOS_microstepping_driver_with_translator.pdf>`__)
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and ULN2003 (`datasheet <http://www.ti.com/lit/ds/symlink/uln2003a.pdf>`__) are supported.
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.. note::
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This component will not show up in the Home Assistant front-end automatically because
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Home Assistant doesn't have support for steppers. Please see :ref:`stepper-ha-config`.
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A4988 Configuration
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-------------------
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.. code-block:: yaml
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# Example configuration entry
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stepper:
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- platform: a4988
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id: my_stepper
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step_pin: D0
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dir_pin: D1
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max_speed: 250 steps/s
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# Optional:
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sleep_pin: D2
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acceleration: inf
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deceleration: inf
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Configuration variables:
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- **id** (**Required**, :ref:`config-id`): Specify the ID of the stepper so that you can control it.
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- **step_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The ``STEP`` pin of the A4988
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stepper driver.
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- **dir_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The ``DIRECTION`` pin of the A4988
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stepper driver.
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- **max_speed** (**Required**, float): The maximum speed in ``steps/s`` (steps per seconds) to drive the
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stepper at. Note most steppers can't step properly with speeds higher than 250 steps/s.
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- **sleep_pin** (*Optional*, :ref:`Pin Schema <config-pin_schema>`): Optionally also use the ``SLEEP`` pin
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of the A4988 stepper driver. If specified, the driver will be put into sleep mode as soon as the stepper
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reaches the target steps.
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- **acceleration** (*Optional*, float): The acceleration in ``steps/s^2`` (steps per seconds squared)
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to use when starting to move. The default is ``inf`` which means infinite acceleration, so the
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stepper will try to drive with the full speed immediately.
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- **deceleration** (*Optional*, float): The same as ``acceleration``, but for when the motor is decelerating
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shortly before reaching the set position. Defaults to ``inf`` (immediate deceleration).
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.. note::
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If the stepper is driving in the wrong direction, you can invert the ``dir_pin``:
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.. code-block:: yaml
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stepper:
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- platform: a4988
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# ...
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dir_pin:
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number: D1
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inverted: True
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ULN2003 Configuration
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---------------------
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.. code-block:: yaml
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# Example configuration entry
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stepper:
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- platform: uln2003
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id: my_stepper
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pin_a: D0
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pin_b: D1
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pin_c: D2
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pin_d: D3
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max_speed: 250 steps/s
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# Optional:
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acceleration: inf
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deceleration: inf
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Configuration variables:
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- **id** (**Required**, :ref:`config-id`): Specify the ID of the stepper so that you can control it.
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- **pin_a**, **pin_b**, **pin_c**, **pin_d** (**Required**, :ref:`Pin Schema <config-pin_schema>`):
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The four pins of the stepper control board.
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- **sleep_when_done** (*Optional*, boolean): Whether to turn off all coils when the stepper has
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reached the target position
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- **step_mode** (*Optional*, string): The step mode to operate the motor with. One of:
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- ``FULL_STEP`` (Default)
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- ``HALF_STEP``
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- ``WAVE_DRIVE``
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- **max_speed** (**Required**, float): The maximum speed in ``steps/s`` (steps per seconds) to drive the
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stepper at. Note most steppers can't step properly with speeds higher than 250 steps/s.
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- **acceleration** (*Optional*, float): The acceleration in ``steps/s^2`` (steps per seconds squared)
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to use when starting to move. The default is ``inf`` which means infinite acceleration, so the
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stepper will try to drive with the full speed immediately.
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- **deceleration** (*Optional*, float): The same as ``acceleration``, but for when the motor is decelerating
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shortly before reaching the set position. Defaults to ``inf`` (immediate deceleration).
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.. _stepper-set_target_action:
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``stepper.set_target`` Action
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-----------------------------
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To use your stepper motor in :ref:`automations <automation>` or templates, you can use this action to set the target
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position (in steps). The stepper will always run towards the target position and stop once it has reached the target.
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.. code-block:: yaml
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on_...:
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then:
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- stepper.set_target:
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id: my_stepper
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target: 250
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# Templated
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- stepper.set_target:
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id: my_stepper
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target: !lambda |-
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if (id(my_binary_sensor).state) {
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return 1000;
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} else {
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return -1000;
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}
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Configuration options:
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- **id** (**Required**, :ref:`config-id`): The ID of the stepper.
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- **target** (*Optional*, int, :ref:`templatable <config-templatable>`): The target position in steps.
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.. warning::
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This turns the stepper to an absolute position! To have the servo move *relative* to the current
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position, first reset the current position and then set the target to the relative value.
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.. code-block:: yaml
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on_...:
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then:
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# Move 150 steps forward
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- stepper.report_position:
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id: my_stepper
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position: 0
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- stepper.set_target:
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id: my_stepper
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target: 150
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.. _stepper-report_position_action:
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``stepper.report_position`` Action
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----------------------------------
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All steppers start out with a target and current position of ``0`` on boot. However, if you for example want to home
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a stepper motor, it can be useful to **report** the stepper where it is currently at.
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With this action, you can set the stepper's internal position counter to a specific value (in steps). Please note
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that reporting the position can create unexpected moves of the stepper. For example, if the stepper's target and
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current position is at 1000 steps and you "report" a position of 0, the stepper will move 1000 steps forward to match
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the target again.
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.. code-block:: yaml
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on_...:
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then:
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- stepper.report_position:
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id: my_stepper
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position: 250
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# It's best to call set_target directly after report_position, so that the stepper doesn't move
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- stepper.set_target:
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id: my_stepper
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target: 250
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# Templated
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- stepper.report_position:
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id: my_stepper
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position: !lambda |-
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if (id(my_binary_sensor).state) {
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return 0;
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} else {
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return -1000;
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}
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Configuration options:
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- **id** (**Required**, :ref:`config-id`): The ID of the stepper.
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- **target** (*Optional*, int, :ref:`templatable <config-templatable>`): The target position in steps.
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.. _stepper-set_speed_action:
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``stepper.set_speed`` Action
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----------------------------
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This :ref:`Action <config-action>` allows you to set the speed of a stepper at runtime.
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.. code-block:: yaml
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on_...:
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- stepper.set_speed:
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id: my_stepper
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speed: 250 steps/s
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Configuration variables:
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- **id** (**Required**, :ref:`config-id`): The ID of the stepper.
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- **speed** (**Required**, :ref:`templatable <config-templatable>`, float): The speed
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in ``steps/s`` (steps per seconds) to drive the stepper at.
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.. _stepper-ha-config:
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Home Assistant Configuration
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----------------------------
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This component will not show up in the Home Assistant frontend automatically because Home Assistant
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does not support steppers natively (raise this issue in Home Assistant forums to make this a
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higher priority for Home Assistant). You can add this to your Home Assistant configuration to
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be able to control the stepper from the frontend.
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.. code-block:: yaml
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# Home Assistant configuration
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input_number:
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stepper_control:
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name: Stepper Control
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initial: 0
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min: -1000
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max: 1000
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step: 1
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mode: slider
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automation:
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- alias: Write Stepper Value to ESP
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trigger:
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platform: state
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entity_id: input_number.stepper_control
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action:
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# Replace livingroom with the name you gave the ESP
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- service: esphome.livingroom_control_stepper
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data_template:
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target: '{{ trigger.to_state.state | int }}'
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.. code-block:: yaml
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# ESPHome configuration
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api:
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services:
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- service: control_stepper
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variables:
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target: int
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then:
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- stepper.set_target:
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id: my_stepper
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target: !lambda 'return target;'
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stepper:
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- platform: ...
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# [...] stepper config
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id: my_stepper
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.. _stepper-lambda_calls:
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lambda calls
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------------
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From :ref:`lambdas <config-lambda>`, you can call several methods on stepper motors to do some
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advanced stuff (see the full API Reference for more info).
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- ``set_target``: Set the target postion of the motor as an integer.
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.. code-block:: cpp
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// Argument is integer (signed int)
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// Set the (absolute) target position to 250 steps
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id(my_stepper).set_target(250);
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- ``report_position``: Report the current postion as an integer.
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.. code-block:: cpp
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// Report the (absolute) current position as 250 steps
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id(my_stepper).report_position(250);
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- ``current_postion``: Get the current postion of the stepper as an integer.
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.. code-block:: cpp
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int pos = id(my_stepper).current_position;
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- ``target_position``: Get the set target postion of the stepper as an integer.
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.. code-block:: cpp
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int pos = id(my_stepper).target_position;
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See Also
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--------
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- :apiref:`stepper/stepper.h`
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- :ghedit:`Edit`
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