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78 lines
2.9 KiB
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78 lines
2.9 KiB
ReStructuredText
Rotary Encoder Sensor
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=====================
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The ``rotary_encoder`` sensor platform allows you to use any continuous-rotation
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rotary encoders with esphomeyaml. These devices usually have two pins with which
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they encode the rotation. Every time the knob of the rotary encoder is turned, the
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signals of the two pins go HIGH and LOW in turn. See
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`this Arduino article <https://playground.arduino.cc/Main/RotaryEncoders>`__ to gain
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a better understanding of these sensors.
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.. figure:: images/rotary_encoder.jpg
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:align: center
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:width: 75.0%
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Example of a continuous rotary encoder. Pin ``+`` is connected to ``3.3V``,
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``GND`` is connected to ``GND``, and ``CLK`` & ``DT`` are A & B.
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.. figure:: /esphomeyaml/components/sensor/images/rotary_encoder-ui.png
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:align: center
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:width: 75.0%
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To use rotary encoders in esphomeyaml, first identify the two pins encoding th step value.
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These are often called ``CLK`` and ``DT`` as in above image. Note if the values this sensor
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outputs go in the wrong direction, you can just swap these two pins.
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.. code:: yaml
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# Example configuration entry
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sensor:
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- platform: rotary_encoder
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name: "Rotary Encoder"
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pin_a: D1
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pin_b: D2
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Configuration variables:
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~~~~~~~~~~~~~~~~~~~~~~~~
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- **pin_a** (**Required**, :ref:`Pin Schema <config-pin_schema>`):
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The first pin for determining the step value. Must not be a pin from an external I/O expander.
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- **pin_b** (**Required**, :ref:`Pin Schema <config-pin_schema>`):
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The second pin for determining the step value. Must not be a pin from an external I/O expander.
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- **name** (**Required**, string): The name of the rotary encoder sensor.
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- **pin_reset** (*Optional*, :ref:`Pin Schema <config-pin_schema>`):
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An optional pin that resets the step value. This is useful with rotary encoders that have have a
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third pin. Defaults to no reset pin.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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- All other options from :ref:`Sensor <config-sensor>` and :ref:`MQTT Component <config-mqtt-component>`.
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Debouncing Output
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~~~~~~~~~~~~~~~~~
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This sensor can output a lot of values in a short period of time when turning the knob.
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In order to not put too much stress on your network connection, you can leverage esphomelib's
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sensor filters. The following will only send out values if the last input value is at least
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0.1s seconds old *or* if the new rotary encoder value has changed by 10 from the previous value.
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.. code:: yaml
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# Example configuration entry
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sensor:
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- platform: rotary_encoder
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name: "Rotary Encoder"
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pin_a: D1
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pin_b: D2
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filters:
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- or:
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- debounce: 0.1s
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- delta: 10
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See Also
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^^^^^^^^
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- :ref:`sensor-filters`
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- :doc:`pulse_counter`
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- :doc:`template`
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- :doc:`API Reference </api/sensor/rotary_encoder>`
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- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/master/esphomeyaml/components/sensor/rotary_encoder.rst>`__
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