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91 lines
3.4 KiB
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NFC Binary Sensor
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=================
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.. seo::
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:description: Instructions for setting up a NFC binary sensor in ESPHome
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:image: nfc.png
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:keywords: PN532, PN7150, PN7160, NFC
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.. _nfc-platform:
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The ``nfc`` binary sensor platform provides an easy way for you to determine if an NFC tag is presented to the reader.
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The tag may be identified in one of three ways:
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- By given unique ID (``uid``) -- for example ``74-10-37-94``
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- By a given NDEF tag "name", or...
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- By a given string contained in the tag's NDEF message/data
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Note that this platform is currently supported by the :doc:`PN7150 <../pn7150>` and :doc:`PN716x <../pn7160>` only;
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one of these components must be present in your device's configuration in order to use it.
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.. code-block:: yaml
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# Example configuration entries
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binary_sensor:
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- platform: nfc
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ndef_contains: pulse
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name: "NFC 1 Tag"
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- platform: nfc
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tag_id: pulsed
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name: "NFC 2 Tag"
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- platform: nfc
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uid: 74-10-37-94
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name: "MFC Tag"
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Configuration variables:
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------------------------
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- **ndef_contains** (*Optional*, string): A (sub)string that must appear in the tag's NDEF message. May not be used
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with ``tag_id`` and/or ``uid`` (below).
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- **tag_id** (*Optional*, string): A string that identifies the tag; in effect, its name. Specifically, this looks
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for the Home Assistant URI encoded into one of the tag's NDEF records and then looks for this specific string. May
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not be used with ``ndef_contains`` and/or ``uid``.
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- **uid** (*Optional*, string): The unique ID of the NFC tag. This is a hyphen-separated list of hexadecimal values.
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For example: ``74-10-37-94``. May not be used with ``ndef_contains`` and/or ``tag_id`` (above).
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- All other options from :ref:`Binary Sensor <config-binary_sensor>`.
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.. _nfc-setting_up_tags:
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Setting Up Tags
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---------------
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To set up a binary sensor for a given NFC tag, you must first know either its unique ID (``uid``), tag ID (if it was
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prepared using the Home Assistant Companion app) or (part of) a string that is contained within its NDEF message.
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To obtain a tag's UID:
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- Set up a simple NFC component (such as the :doc:`PN532 <pn532>`, :doc:`PN7150 <../pn7150>` or :doc:`PN716x <../pn7160>`)
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configuration without any binary sensors.
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- Approach the NFC reader with an NFC tag. When the tag is sufficiently close to the reader, you'll see a message in the
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ESPHome device's logs similar to this:
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.. code::
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Read tag type Mifare Classic with UID 1C-E5-E7-A6
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- Either:
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- Copy this ID and use it to create a ``binary_sensor`` entry as shown in the configuration example above, or...
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- Use the tag ID (as determined when it was prepared with the Home Assistant Companion app) to define the ``tag_id``
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parameter for the ``binary_sensor`` as shown above, or...
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- Choose a substring contained within the tag's NDEF message and use this to define the ``ndef_contains`` parameter
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as shown in the example above. If present, the tag's NDEF records will appear in the log on the lines just below
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the message shown above.
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Repeat this process for each tag.
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Note that, since *you* are able to define the NDEF message, this approach is more flexible and even allows multiple
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cards/tags to share the same message.
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See Also
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--------
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- :doc:`index`
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- :doc:`pn532`
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- :doc:`../pn7150`
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- :doc:`../pn7160`
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- :apiref:`pn532/pn532.h`
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- :apiref:`pn7150/pn7150.h`
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- :apiref:`pn7160/pn7160.h`
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- :ghedit:`Edit`
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