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51 lines
1.8 KiB
ReStructuredText
51 lines
1.8 KiB
ReStructuredText
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.. _display-qrcode:
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QR Code Component
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=================
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.. seo::
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:description: Instructions for displaying a QR Code in ESPHome
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:image: qr-code.svg
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Use this component to generate a QR-code containing a string on the device, which can then be drawn on compatible displays.
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.. code-block:: yaml
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qr_code:
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- id: homepage_qr
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value: esphome.io
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Configuration variables:
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------------------------
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- **id** (**Required**, :ref:`config-id`): The ID with which you will be able to reference the QR-code later
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in your display code.
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- **value** (**Required**, string): The string which you want to encode in the QR-code.
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- **ecc** (*Optional*, string): The error correction code level you want to use. Defaults to ``LOW``. You can use one of the following values:
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- ``LOW``: The QR Code can tolerate about 7% erroneous codewords
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- ``MEDIUM``: The QR Code can tolerate about 15% erroneous codewords
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- ``QUARTILE``: The QR Code can tolerate about 25% erroneous codewords
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- ``HIGH``: The QR Code can tolerate about 30% erroneous codewords
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To draw the QR-code, call the ``it.qr_code`` function from your render lambda:
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.. code-block:: yaml
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display:
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- platform: ...
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# ...
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pages:
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- id: page1
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lambda: |-
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// Draw the QR-code at position [x=50,y=0] with white color and a 2x scale
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it.qr_code(50, 0, id(homepage_qr), Color(255,255,255), 2);
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// Draw the QR-code in the center of the screen with white color and a 2x scale
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auto size = id(homepage_qr).get_size() * 2; // Multiply by scale
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auto x = (it.get_width() / 2) - (size / 2);
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auto y = (it.get_height() / 2) - (size / 2);
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it.qr_code(x, y, id(homepage_qr), Color(255,255,255), 2);
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