54 lines
1.8 KiB
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54 lines
1.8 KiB
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Relay
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=====
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.. seo::
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:description: Instructions for using relays in esphomelib.
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:image: relay.jpg
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:keywords: Relay
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.. figure:: images/relay-full.jpg
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:align: center
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:width: 80.0%
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Relays are simple electronics components that allow you to switch a high load
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using only a single pin on your board.
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On the inside of a relay there is a coil that's connected to the input signal.
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Every time the input signal switches on, the current flowing through the coil induces
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a magnetic field that closes a contact.
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On the output side you have three pins: common (``COM``), normally open (``NO``) and
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normally closed (``NC``). Connect ``COM`` and one of ``NO`` and ``NC`` in series
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with your load. When the input turns on, ``NO`` is connected to ``COM`` and
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when the input turns off, ``NC`` is connected to ``COM``.
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.. warning::
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Relays are a very common component in electronics, so there are *many* types of them and
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I won't attempt to describe all of them (partly due to my own lack of knowledge). Please
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check with the datasheet of your relay to see its current limits, what voltage it requires
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and so on. Please also note that relays are physical components - as such, they have a limited
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number of switches that can happen before they break.
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To use a relay with esphomelib, use a :doc:`GPIO Switch </components/switch/gpio>`.
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.. code-block:: yaml
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switch:
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- platform: gpio
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name: "Relay"
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pin: <PIN_RELAY_IS_CONNECTED_TO>
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For a more complete example, check :doc:`Simple Garage Door </cookbook/garage-door>`.
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See Also
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--------
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- :doc:`/components/switch/gpio`
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- :doc:`/components/output/gpio`
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- :doc:`/cookbook/garage-door`
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- `How do relays work <https://www.explainthatstuff.com/howrelayswork.html>`__.
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- :ghedit:`Edit`
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.. disqus::
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