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88 lines
3.2 KiB
ReStructuredText
88 lines
3.2 KiB
ReStructuredText
Ultrasonic Distance Sensor
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==========================
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The ultrasonic distance sensor allows you to use simple ultrasonic
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sensors like the HC-SR04
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(`datasheet <https://www.electroschematics.com/wp-content/uploads/2013/07/HC-SR04-datasheet-version-2.pdf>`__,
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`sparkfun <https://www.sparkfun.com/products/13959>`__) with esphomelib
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to measure distances. These sensors usually can’t measure anything more
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than about two meters and may sometimes make some annoying clicking
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sounds.
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This sensor platform expects a sensor that can be sent a **trigger
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pulse** on a specific pin and will send out a **echo pulse** once a
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measurement has been taken. Because sometimes (for example if no object
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is detected) the echo pulse is never returned, this sensor also has a
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timeout option which specifies how long to wait for values. During this
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timeout period the whole core will be blocked and therefore shouldn't be
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set too high.
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.. figure:: images/ultrasonic-full.jpg
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:align: center
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:width: 50.0%
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HC-SR04 Ultrasonic Distance Sensor.
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.. figure:: images/ultrasonic-ui.png
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:align: center
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:width: 80.0%
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.. code:: yaml
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# Example configuration entry
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sensor:
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- platform: ultrasonic
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trigger_pin: D1
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echo_pin: D2
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name: "Ultrasonic Sensor"
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Configuration variables:
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------------------------
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- **trigger_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The output pin to
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periodically send the trigger pulse to.
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- **echo_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The input pin on which to
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wait for the echo.
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- **name** (**Required**, string): The name of the sensor.
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- **timeout_meter** (*Optional*, float): The number of meters for the
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timeout. Use either this or ``timeout_time``. Defaults to 2 meters.
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- **timeout_time** (*Optional*, int): The number of microseconds for
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the timeout. Use either this or ``timeout_meter``. Defaults to
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11662µs.
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- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the
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sensor. Defaults to ``15s``. See :ref:`sensor-default_filter`.
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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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Ultrasonic Timeouts
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-------------------
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The ultrasonic sensor works by sending a small ultrasonic pulse out and then waiting until
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the pulse arrives back. However, there are cases where no such signal arrives back. This is most commonly caused
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by either having the sensor pointed at a soft surface that muffles the incoming signal. The other case where this
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can happen is when the the object is too far away and the timeout set by the ``timeout_meter`` or ``timeout_time``
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option kicks in.
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To remove ``NAN`` values from the sensor stream, use the ``filter_nan`` :ref:`sensor filter <sensor-filters>`:
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.. code:: yaml
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sensor:
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- platform: ultrasonic
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trigger_pin: D1
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echo_pin: D2
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name: "Ultrasonic Sensor"
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filters:
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-
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See Also
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--------
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- :ref:`sensor-filters`
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- :doc:`template`
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- :doc:`API Reference </api/sensor/ultrasonic>`
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- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/components/sensor/ultrasonic.rst>`__
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.. disqus::
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