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64 lines
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64 lines
2.3 KiB
ReStructuredText
Passive Infrared Sensor
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=======================
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.. figure:: images/pir-header.jpg
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:align: center
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:width: 75.0%
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Passive Infrared Sensors (or PIR sensors for short) are completely supported by
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esphomelib. These sensors measure the infrared light emitted from objects in its
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field of view, and if it detects a sudden change between different parts of the
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sensing area, the signal is pulled high.
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.. figure:: images/pir-inside.jpg
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:align: center
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:width: 60.0%
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Connecting the PIR sensor is also quite simple. You need to connect ``GND`` to a GND pin
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on your board and ``VCC`` to a ``5V`` or ``12V`` pin. Technically you can also connect
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``VCC`` to ``3.3V``, but the sensor measurements won't be as stable.
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Next you need to connect the signal pin (``OUT``). Fortunately, the sensor signal has
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a voltage of ``3.3V`` max, so we can directly connect it to a free GPIO pin on the ESP board.
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Otherwise, we would need to step down the voltage in order to not damage the ESP.
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.. figure:: images/pir-pins.jpg
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:align: center
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:width: 75.0%
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.. warning::
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Some PIR sensors have the GND and power supply pins swapped, please open the front
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cover to see which pin mapping your PIR sensor is using to make sure.
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On the back side you will additionally find two knobs that you can turn to change the sensor
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sensitivity and time the signal will stay active for once motion has been detected. Turning
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these clockwise will increase sensitivity/re-trigger time.
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To configure esphomeyaml for use with the PIR sensor, use a
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:doc:`GPIO Binary Sensor </esphomeyaml/components/binary_sensor/gpio>`. It can detect
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if a pin is pulled HIGH/LOW and reports those values to Home Assistant. Optionally also
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set a ``device_class`` so that Home Assistant uses a nice icon for the binary sensor.
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.. code:: yaml
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binary_sensor:
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- platform: gpio
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pin: <PIN_PIR_SENSOR_IS_CONNECTED_TO>
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name: "PIR Sensor"
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device_class: motion
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.. figure:: images/pir-ui.png
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:align: center
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:width: 60.0%
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See Also
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--------
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- `Awesome article explaining how PIR Sensors work <https://learn.adafruit.com/pir-passive-infrared-proximity-motion-sensor/how-pirs-work>`__.
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- :doc:`/esphomeyaml/components/binary_sensor/gpio`
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- :doc:`bruh`
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- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/cookbook/pir.rst>`__
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.. disqus::
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