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136 lines
5.0 KiB
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TM1637 7-Segment Display
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========================
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.. seo::
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:description: Instructions for setting up TM1637 7-segment displays.
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:image: tm1637.jpg
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The ``tm1637`` display platform allows you to use the popular TM1637 7-segment display drivers with ESPHome.
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.. figure:: images/tm1637-full.jpg
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:align: center
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:width: 75.0%
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TM1637 7-Segment Display.
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The module can be powered with 5v or with 3.3v too. To display the colon punctuation use the
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``.`` in the colon place. (See clock example below)
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.. code-block:: yaml
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# Example configuration entry
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display:
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platform: tm1637
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id: tm1637_display
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clk_pin: D6
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dio_pin: D5
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inverted: true
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length: 4
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lambda: |-
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it.print("0123");
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Configuration variables:
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------------------------
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- **clk_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The pin you have the CLK line hooked up to.
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- **dio_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The pin you have the DIO line hooked up to.
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- **intensity** (*Optional*, int): The intensity with which the TM1637 should drive the outputs. Range is from
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0 (least intense) to 7 (the default).
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- **inverted** (*Optional*, bool): Invert character rendering to the TM1637 so you can physically flip the display around.
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- **length** (*Optional*, int): The amount of digits your TM1637 is driving. Only used when ``inverted: true``
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Range is from 1 to 6 (the default).
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- **lambda** (*Optional*, :ref:`lambda <config-lambda>`): The lambda to use for rendering the content on the TM1637.
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See :ref:`display-tm1637_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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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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.. _display-tm1637_lambda:
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Rendering Lambda
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----------------
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The TM1637 has a similar API to the fully fledged :ref:`display-engine`, but it's only a subset as the TM1637
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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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as with all other displays. In this case however, ``it`` is a TM1637 instance (see API Reference).
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The most basic operation with the TM1637 is wiring a simple number to the screen as in the configuration example
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at the top of this page. But even though you're passing in a string (here ``"0123"``), ESPHome converts it
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into a representation that the TM1637 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:`at the MAX7219 docs <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 TM1637. For example to start the first character of your text at
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the end of the TM1637, you would write ``it.print(3, "0");``.
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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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segment of the previous position will be enabled.
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.. code-block:: yaml
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display:
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- platform: tm1637
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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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it.printf(0, "%.1f", id(my_sensor).state);
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// Result: "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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it.printf("S%3.0f", id(my_sensor).state);
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// Result: "S 42"
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// Print the current time
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it.strftime("%H.%M");
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// Result for 10:06:42 -> "10:06" on a display with : and "10.06" on a display with .
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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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Creating a digital clock
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************************
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The following example creates a typical digital clock with the ``:`` colon flashing every second.
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.. code-block:: yaml
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time:
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- platform: homeassistant
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id: homeassistant_time
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display:
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platform: tm1637
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clk_pin: D6
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dio_pin: D5
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update_interval: 500ms
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lambda: |-
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static int i = 0;
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i++;
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if ((i % 2) == 0)
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it.strftime("%H.%M", id(homeassistant_time).now());
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else
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it.strftime("%H%M", id(homeassistant_time).now());
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See Also
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--------
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- :doc:`index`
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- :apiref:`tm1637/tm1637.h`
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- `TD1637 Library <https://github.com/avishorp/TM1637>`__ by `Avishay <https://github.com/avishorp>`__
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- :ghedit:`Edit`
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