mirror of
https://github.com/esphome/esphome-docs.git
synced 2024-11-15 10:45:41 +01:00
186 lines
6.8 KiB
ReStructuredText
186 lines
6.8 KiB
ReStructuredText
TM1637 7-Segment Display
|
|
========================
|
|
|
|
.. seo::
|
|
:description: Instructions for setting up TM1637 7-segment displays.
|
|
:image: tm1637.jpg
|
|
|
|
The ``tm1637`` display platform allows you to use the popular TM1637 7-segment display drivers with ESPHome.
|
|
|
|
.. figure:: images/tm1637-full.jpg
|
|
:align: center
|
|
:width: 75.0%
|
|
|
|
TM1637 7-Segment Display.
|
|
|
|
The module can be powered with 5v or with 3.3v too. To display the colon punctuation use the
|
|
``.`` in the colon place. (See clock example below)
|
|
|
|
|
|
.. code-block:: yaml
|
|
|
|
# Example configuration entry
|
|
display:
|
|
platform: tm1637
|
|
id: tm1637_display
|
|
clk_pin: D6
|
|
dio_pin: D5
|
|
inverted: true
|
|
length: 4
|
|
lambda: |-
|
|
it.print("0123");
|
|
|
|
|
|
Configuration variables:
|
|
------------------------
|
|
|
|
- **clk_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The pin you have the CLK line hooked up to.
|
|
- **dio_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The pin you have the DIO line hooked up to.
|
|
- **intensity** (*Optional*, int): The intensity with which the TM1637 should drive the outputs. Range is from
|
|
0 (least intense) to 7 (the default).
|
|
- **inverted** (*Optional*, bool): Invert character rendering to the TM1637 so you can physically flip the display around.
|
|
- **length** (*Optional*, int): The amount of digits your TM1637 is driving. Only used when ``inverted: true``
|
|
Range is from 1 to 6 (the default).
|
|
- **lambda** (*Optional*, :ref:`lambda <config-lambda>`): The lambda to use for rendering the content on the TM1637.
|
|
See :ref:`display-tm1637_lambda` for more information.
|
|
- **update_interval** (*Optional*, :ref:`config-time`): The interval to re-draw the screen. Defaults to ``1s``.
|
|
- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
|
|
|
|
.. _display-tm1637_lambda:
|
|
|
|
Binary Sensor
|
|
-------------
|
|
|
|
The TM1637 LED display controller also includes a special circuit with keyboard scan interface and enhanced identification circuit with anti-interference keys.
|
|
This circuit uses the 8 segment lines that also drive the LED display. But combined with the K1 and K2 pins we can add 16 keys that can be used as binary sensors in esphome.
|
|
|
|
.. figure:: images/tm1637_key_connections.png
|
|
:align: center
|
|
:width: 50.0%
|
|
|
|
TM1637 display keyboard connections
|
|
|
|
.. code-block:: yaml
|
|
|
|
binary_sensor:
|
|
- platform: tm1637
|
|
id: key0
|
|
name: key1-00
|
|
tm1637_id: tm1637_display
|
|
key: 0
|
|
|
|
Configuration variables:
|
|
************************
|
|
|
|
- **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor.
|
|
- **name** (*Optional*, string): The name for the binary sensor.
|
|
- **tm1637_id** (*Optional*, ::ref:`config-id`): The id of the tm1637 that should be used to scan the keys in case you are using multiple devices.
|
|
- **key** (**Required**, integer): The keycode for the connected key (Seg0 = 0, Seg1 = 1 etc,). Range is from
|
|
0 to 15.
|
|
- All other options from :ref:`Binary Sensor <config-binary_sensor>`.
|
|
|
|
Rendering Lambda
|
|
----------------
|
|
|
|
The TM1637 has a similar API to the fully fledged :ref:`display-engine`, but it's only a subset as the TM1637
|
|
7-segment displays don't have a concept of individual pixels. In the lambda you're passed a variable called ``it``
|
|
as with all other displays. In this case however, ``it`` is a TM1637 instance (see API Reference).
|
|
|
|
The most basic operation with the TM1637 is wiring a simple number to the screen as in the configuration example
|
|
at the top of this page. But even though you're passing in a string (here ``"0123"``), ESPHome converts it
|
|
into a representation that the TM1637 can understand: The exact pixels that should be turned on. And of course,
|
|
not all characters can be represented. You can see a full list of characters :ref:`at the MAX7219 docs <display-max7219_characters>`.
|
|
|
|
Each of the three methods (``print``, ``printf`` and ``strftime``) all optionally take a position argument at the
|
|
beginning which can be used to print the text at a specific position. This argument is ``0`` by default which
|
|
means the first character of the first TM1637. For example to start the first character of your text at
|
|
the end of the TM1637, you would write ``it.print(3, "0");``.
|
|
|
|
Also note that the ``.`` (dot) character is special because when ESPHome encounters it in the string the dot
|
|
segment of the previous position will be enabled.
|
|
|
|
.. code-block:: yaml
|
|
|
|
display:
|
|
- platform: tm1637
|
|
# ...
|
|
lambda: |-
|
|
// Print 0 at position 0 (left)
|
|
it.print("0");
|
|
// Result: "0 "
|
|
|
|
// Print 1 at position 1 (second character)
|
|
it.print(1, "1");
|
|
// Result: "01 "
|
|
|
|
// Let's write a sensor value (let's assume it's 42.1)
|
|
it.printf(0, "%.1f", id(my_sensor).state);
|
|
// Result: "42.1 " (the dot will appear on the "2" segment)
|
|
|
|
// Overwrite the previous content with blank
|
|
it.print(" ");
|
|
// Print a right-padded sensor value with 0 digits after the decimal
|
|
it.printf("S%3.0f", id(my_sensor).state);
|
|
// Result: "S 42"
|
|
|
|
// Print the current time
|
|
it.strftime("%H.%M");
|
|
// Result for 10:06:42 -> "10:06" on a display with : and "10.06" on a display with .
|
|
|
|
Please see :ref:`display-printf` for a quick introduction into the ``printf`` formatting rules and
|
|
:ref:`display-strftime` for an introduction into the ``strftime`` time formatting.
|
|
|
|
Creating a digital clock
|
|
************************
|
|
|
|
The following example creates a typical digital clock with the ``:`` colon flashing every second.
|
|
|
|
|
|
.. code-block:: yaml
|
|
|
|
|
|
time:
|
|
- platform: homeassistant
|
|
id: homeassistant_time
|
|
|
|
display:
|
|
platform: tm1637
|
|
clk_pin: D6
|
|
dio_pin: D5
|
|
update_interval: 500ms
|
|
lambda: |-
|
|
static int i = 0;
|
|
i++;
|
|
if ((i % 2) == 0)
|
|
it.strftime("%H.%M", id(homeassistant_time).now());
|
|
else
|
|
it.strftime("%H%M", id(homeassistant_time).now());
|
|
|
|
Connect multiple displays
|
|
-------------------------
|
|
|
|
To connect multiple TM1636 displays you need as many control lines as you have displays. This is achived by sharing control-lines for clk and dio between displays.
|
|
|
|
.. figure:: images/tm1637_2devices.png
|
|
:align: center
|
|
:width: 50.0%
|
|
|
|
Two TM1637 displays on only 2 control lines
|
|
|
|
When using more than 2 devices like 3 or more you add a control-line for the Dio pin and share this with the next display Clk pin.
|
|
The last displays Dio pin shares the Clk pin of the first display.
|
|
|
|
.. figure:: images/tm1637_3plus_devices.png
|
|
:align: center
|
|
:width: 50.0%
|
|
|
|
Three TM1637 displays on 3 control lines
|
|
|
|
See Also
|
|
--------
|
|
|
|
- :doc:`index`
|
|
- :apiref:`tm1637/tm1637.h`
|
|
- `TD1637 Library <https://github.com/avishorp/TM1637>`__ by `Avishay <https://github.com/avishorp>`__
|
|
- :ghedit:`Edit`
|