2018-08-24 22:44:01 +02:00
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MAX7219 7-Segment Display
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2018-08-22 22:05:28 +02:00
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=========================
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2018-11-14 22:12:27 +01:00
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.. seo::
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2019-02-07 13:54:45 +01:00
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:description: Instructions for setting up MAX7219 7-segment displays.
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2018-11-14 22:12:27 +01:00
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:image: max7219.jpg
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2019-02-27 18:32:47 +01:00
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The ``max7219`` display platform allows you to use MAX7219 7-segment display drivers (
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`datasheet <https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf>`__,
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2018-08-22 22:05:28 +02:00
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`hobbycomponents <https://hobbycomponents.com/displays/597-max7219-8-digit-seven-segment-display-module>`__)
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2019-02-16 23:25:23 +01:00
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with ESPHome. Please note that this integration is *only* for 7-segment display, not matrix configurations.
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2018-08-22 22:05:28 +02:00
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.. figure:: images/max7219-full.jpg
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:align: center
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:width: 75.0%
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2018-08-24 22:44:01 +02:00
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MAX7219 7-Segment Display.
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2018-08-22 22:05:28 +02:00
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As the communication with the MAX7219 is done using SPI for this integration, you need
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to have an :ref:`SPI bus <spi>` in your configuration with both the **mosi_pin** set (miso_pin is not required).
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Connect VCC to 3.3V (the manufacturer recommends 4+ V, but 3.3V seems to work fine), DIN to your ``mosi_pin`` and
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CS to your set ``cs_pin`` and finally GND to GND.
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You can even daisy-chain multiple MAX7219s by connecting the DOUT of the previous chip in the chain to the
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next DIN. With more than ~3 chips the 3.3V will probably not be enough, so then you will have to potentially
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use a logic level converted.
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2018-11-19 18:32:16 +01:00
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.. code-block:: yaml
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2018-08-22 22:05:28 +02:00
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# Example configuration entry
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spi:
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clk_pin: D0
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mosi_pin: D1
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display:
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- platform: max7219
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cs_pin: D2
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num_chips: 1
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lambda: |-
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it.print("01234567");
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Configuration variables:
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------------------------
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- **cs_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The pin you have the CS line hooked up to.
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- **num_chips** (*Optional*, integer): The number of chips you wish to use for daisy chaining. Defaults to
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``1``.
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- **intensity** (*Optional*, integer): The intensity with which the MAX7219 should drive the outputs. Range is from
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0 (least intense) to 15 (the default).
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- **lambda** (*Optional*, :ref:`lambda <config-lambda>`): The lambda to use for rendering the content on the MAX7219.
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See :ref:`display-max7219_lambda` for more information.
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- **update_interval** (*Optional*, :ref:`config-time`): The interval to re-draw the screen. Defaults to ``1s``.
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- **spi_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the :ref:`SPI Component <spi>` if you want
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to use multiple SPI buses.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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.. _display-max7219_lambda:
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Rendering Lambda
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----------------
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2019-02-07 13:54:45 +01:00
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The MAX7219 has a similar API to the fully fledged :ref:`display-engine`, but it's only a subset as the MAX7219
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2018-08-24 22:44:01 +02:00
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7-segment displays don't have a concept of individual pixels. In the lambda you're passed a variable called ``it``
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2019-02-07 13:54:45 +01:00
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as with all other displays. In this case however, ``it`` is an MAX7219 instance (see API Reference).
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2018-08-22 22:05:28 +02:00
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The most basic operation with the MAX7219 is wiring a simple number to the screen as in the configuration example
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2019-02-16 23:25:23 +01:00
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at the top of this page. But even though you're passing in a string (here ``"01234567"``), ESPHome converts it
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2018-08-22 22:05:28 +02:00
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into a representation that the MAX7219 can understand: The exact pixels that should be turned on. And of course,
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not all characters can be represented. You can see a full list of characters :ref:`below <display-max7219_characters>`.
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Each of the three methods (``print``, ``printf`` and ``strftime``) all optionally take a position argument at the
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beginning which can be used to print the text at a specific position. This argument is ``0`` by default which
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means the first character of the first MAX7219. For example to start the first character of your text at
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the end of the first MAX7219, you would write ``it.print(7, "0");``.
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2019-02-16 23:25:23 +01:00
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Also note that the ``.`` (dot) character is special because when ESPHome encounters it in the string the dot
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2018-08-22 22:05:28 +02:00
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segment of the previous position will be enabled.
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2018-11-19 18:32:16 +01:00
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.. code-block:: yaml
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2018-08-22 22:05:28 +02:00
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display:
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- platform: max7219
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# ...
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lambda: |-
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// Print 0 at position 0 (left)
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it.print("0");
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// Result: "0 "
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// Print 1 at position 1 (second character)
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it.print(1, "1");
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// Result: "01 "
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// Let's write a sensor value (let's assume it's 42.1)
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2018-10-20 14:53:27 +02:00
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it.printf(3, "%.1f", id(my_sensor).state);
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// Result: "01 42.1 " (the dot will appear on the "2" segment)
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// Overwrite the previous content with blank
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it.print(" ");
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// Print a right-padded sensor value with 0 digits after the decimal
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2018-10-20 14:53:27 +02:00
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it.printf("SENS%4.0f", id(my_sensor).state);
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2018-08-22 22:05:28 +02:00
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// Result: "SENS 42"
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// Print the current time
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it.print(" ");
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it.strftime("%H.%M.%S");
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// Result for 10:06:42 -> "10.06.42 "
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Please see :ref:`display-printf` for a quick introduction into the ``printf`` formatting rules and
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:ref:`display-strftime` for an introduction into the ``strftime`` time formatting.
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.. _display-max7219_characters:
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2018-08-24 22:44:01 +02:00
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All 7-Segment Characters
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------------------------
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2019-02-14 16:19:07 +01:00
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============================== ==============================
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**MAX7219 Representation** **Character**
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------------------------------ ------------------------------
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|max721900| *(space)*
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------------------------------ ------------------------------
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|max721980| ``.``
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------------------------------ ------------------------------
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|max7219B0| ``!``
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------------------------------ ------------------------------
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|max72197E| ``0``, ``O``
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------------------------------ ------------------------------
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|max721930| ``1``, ``I``
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------------------------------ ------------------------------
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|max72196D| ``2``, ``Z``
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------------------------------ ------------------------------
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|max721979| ``3``
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------------------------------ ------------------------------
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|max721933| ``4``
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------------------------------ ------------------------------
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|max72195B| ``5``, ``S``, ``s``
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------------------------------ ------------------------------
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|max72195F| ``6``
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------------------------------ ------------------------------
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|max721970| ``7``
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------------------------------ ------------------------------
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|max72197F| ``8``
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------------------------------ ------------------------------
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|max721973| ``9``
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------------------------------ ------------------------------
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|max721937| ``H``
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------------------------------ ------------------------------
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|max72194E| ``(``, ``[``, ``C``
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------------------------------ ------------------------------
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|max721931| ``{``
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------------------------------ ------------------------------
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|max721978| ``)``, ``]``
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------------------------------ ------------------------------
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|max721907| ``}``, ``T``, ``t``
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------------------------------ ------------------------------
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|max721920| ``\```
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------------------------------ ------------------------------
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|max721902| ``'``
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------------------------------ ------------------------------
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|max721922| ``"``
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------------------------------ ------------------------------
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|max72196F| ``@``
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------------------------------ ------------------------------
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|max721965| ``?``
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------------------------------ ------------------------------
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|max721910| ``,``, ``i``
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------------------------------ ------------------------------
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|max721949| ``%``
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------------------------------ ------------------------------
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|max721940| ``*``
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------------------------------ ------------------------------
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|max721948| ``:``
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------------------------------ ------------------------------
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|max721958| ``;``
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------------------------------ ------------------------------
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|max721977| ``A``, ``a``
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------------------------------ ------------------------------
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|max72191F| ``B``, ``b``
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------------------------------ ------------------------------
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|max72193D| ``D``, ``d``
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------------------------------ ------------------------------
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|max72194F| ``E``, ``e``
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------------------------------ ------------------------------
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|max721947| ``F``, ``f``
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------------------------------ ------------------------------
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|max72195E| ``G``, ``g``
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------------------------------ ------------------------------
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|max72193C| ``J``, ``j``
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------------------------------ ------------------------------
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|max72190E| ``L``, ``l``
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------------------------------ ------------------------------
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|max721915| ``N``, ``n``
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------------------------------ ------------------------------
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|max721967| ``P``, ``p``
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------------------------------ ------------------------------
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|max7219FE| ``Q``
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------------------------------ ------------------------------
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|max721905| ``R``, ``r``
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------------------------------ ------------------------------
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|max72193E| ``U``, ``V``
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------------------------------ ------------------------------
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|max72193F| ``W``
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------------------------------ ------------------------------
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|max721927| ``Y``, ``y``
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------------------------------ ------------------------------
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|max721901| ``-``
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------------------------------ ------------------------------
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|max721908| ``_``
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------------------------------ ------------------------------
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|max721906| ``|``
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------------------------------ ------------------------------
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|max72190D| ``c``
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------------------------------ ------------------------------
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|max721917| ``h``
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------------------------------ ------------------------------
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|max72191D| ``o``
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------------------------------ ------------------------------
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|max72191C| ``u``, ``v``
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============================== ==============================
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.. |max721900| image:: images/max7219/seg00.svg
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:class: component-image
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.. |max721980| image:: images/max7219/seg80.svg
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:class: component-image
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.. |max7219B0| image:: images/max7219/segB0.svg
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:class: component-image
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.. |max72197E| image:: images/max7219/seg7E.svg
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:class: component-image
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.. |max721930| image:: images/max7219/seg30.svg
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:class: component-image
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.. |max72196D| image:: images/max7219/seg6D.svg
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:class: component-image
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.. |max721979| image:: images/max7219/seg79.svg
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:class: component-image
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.. |max721933| image:: images/max7219/seg33.svg
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:class: component-image
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.. |max72195B| image:: images/max7219/seg5B.svg
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:class: component-image
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.. |max72195F| image:: images/max7219/seg5F.svg
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:class: component-image
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.. |max721970| image:: images/max7219/seg70.svg
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:class: component-image
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.. |max72197F| image:: images/max7219/seg7F.svg
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:class: component-image
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.. |max721973| image:: images/max7219/seg73.svg
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:class: component-image
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.. |max721937| image:: images/max7219/seg37.svg
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:class: component-image
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.. |max72194E| image:: images/max7219/seg4E.svg
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:class: component-image
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.. |max721931| image:: images/max7219/seg31.svg
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:class: component-image
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.. |max721978| image:: images/max7219/seg78.svg
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:class: component-image
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.. |max721907| image:: images/max7219/seg07.svg
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:class: component-image
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.. |max721920| image:: images/max7219/seg20.svg
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:class: component-image
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.. |max721902| image:: images/max7219/seg02.svg
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:class: component-image
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.. |max721922| image:: images/max7219/seg22.svg
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:class: component-image
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.. |max72196F| image:: images/max7219/seg6F.svg
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:class: component-image
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.. |max721965| image:: images/max7219/seg65.svg
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:class: component-image
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.. |max721910| image:: images/max7219/seg10.svg
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:class: component-image
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.. |max721949| image:: images/max7219/seg49.svg
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:class: component-image
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.. |max721940| image:: images/max7219/seg40.svg
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:class: component-image
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.. |max721948| image:: images/max7219/seg48.svg
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:class: component-image
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.. |max721958| image:: images/max7219/seg58.svg
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:class: component-image
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.. |max721977| image:: images/max7219/seg77.svg
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:class: component-image
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.. |max72191F| image:: images/max7219/seg1F.svg
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:class: component-image
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.. |max72193D| image:: images/max7219/seg3D.svg
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:class: component-image
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.. |max72194F| image:: images/max7219/seg4F.svg
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:class: component-image
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.. |max721947| image:: images/max7219/seg47.svg
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:class: component-image
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.. |max72195E| image:: images/max7219/seg5E.svg
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:class: component-image
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.. |max72193C| image:: images/max7219/seg3C.svg
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:class: component-image
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.. |max72190E| image:: images/max7219/seg0E.svg
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:class: component-image
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.. |max721915| image:: images/max7219/seg15.svg
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:class: component-image
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.. |max721967| image:: images/max7219/seg67.svg
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:class: component-image
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.. |max7219FE| image:: images/max7219/segFE.svg
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:class: component-image
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.. |max721905| image:: images/max7219/seg05.svg
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:class: component-image
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.. |max72193E| image:: images/max7219/seg3E.svg
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:class: component-image
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.. |max72193F| image:: images/max7219/seg3F.svg
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:class: component-image
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.. |max721927| image:: images/max7219/seg27.svg
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:class: component-image
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.. |max721901| image:: images/max7219/seg01.svg
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:class: component-image
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.. |max721908| image:: images/max7219/seg08.svg
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:class: component-image
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.. |max721906| image:: images/max7219/seg06.svg
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:class: component-image
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.. |max72190D| image:: images/max7219/seg0D.svg
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:class: component-image
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.. |max721917| image:: images/max7219/seg17.svg
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:class: component-image
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.. |max72191D| image:: images/max7219/seg1D.svg
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:class: component-image
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.. |max72191C| image:: images/max7219/seg1C.svg
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:class: component-image
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.. note::
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2018-08-24 22:44:01 +02:00
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Original 7-segment display base image taken from Wikipedia at https://de.wikipedia.org/wiki/Datei:7_Segment_Display.svg
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2018-08-22 22:05:28 +02:00
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by user `h2g2bob <https://commons.wikimedia.org/wiki/User:H2g2bob>`__ under
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`Creative Commons BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0/deed.de>`__ and modified
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for this documentation.
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See Also
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--------
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- :doc:`index`
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2019-02-07 13:54:45 +01:00
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- :apiref:`display/max7219.h`
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2018-08-24 22:44:01 +02:00
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- `MAX7219 Library <https://github.com/nickgammon/MAX7219>`__ by `Nick Gammon <https://github.com/nickgammon>`__
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2019-02-07 13:54:45 +01:00
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- :ghedit:`Edit`
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2019-03-06 11:02:03 +01:00
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.. disqus::
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