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166 lines
4.9 KiB
ReStructuredText
166 lines
4.9 KiB
ReStructuredText
Time & Temperature on OLED Display
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==================================
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.. seo::
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:description: Instructions for setting up a display in ESPHome to show sensor values from Home Assistant
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:image: display_time_temp_oled_1.jpg
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:keywords: Display
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.. figure:: images/display_time_temp_oled_1.jpg
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:align: left
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:width: 75.0%
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In this example I have used a :doc:`SSD1306 OLED Display over I²C </components/display/ssd1306>` to
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show current time and two different temperature values from Home Assistant.
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ESPHome has support for several different types of displays. The display used here is 1.3" with 128x64 monochrome pixels (``SH1106 128x64``).
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Hardware configuration
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----------------------
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Hardware is easy! Only four connections are needed:
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- ``VCC`` - Power (my display could use either 3.3V or 5V)
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- ``GND`` - Ground
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- ``SDA`` - Serial Data
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- ``SCL`` - Serial Clock
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.. warning::
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Ensure your display handles 5V if you use that.
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Software configuration
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----------------------
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Getting Time
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************
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Get the time from Home Assistant to sync the onboard real-time clock.
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.. code-block:: yaml
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time:
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- platform: homeassistant
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id: esptime
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Getting Temperature
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*******************
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Next, we want to get two temperature sensors imported from Home Assistant.
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I named them ``inside_temperature`` and ``outside_temperature``. You will use those references later.
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By adding ``internal: true`` to the sensors they won't be published back to Home Assistant.
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.. code-block:: yaml
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sensor:
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- platform: homeassistant
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id: inside_temperature
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entity_id: sensor.mellanvaning_temperature
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internal: true
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- platform: homeassistant
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id: outside_temperature
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entity_id: sensor.10_00080192969d_temperature
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internal: true
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Define the Fonts
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****************
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- TrueType fonts are used. If you ever worked with fonts on microcontrollers you will love this!
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- Save font files in ``/config/esphome`` folder where your ESPHome configuration is stored.
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- The ``.ttf`` suffix must be lowercase and of course match your filename.
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- Selection of fonts can be a little bit tricky for small sizes to look good. Experiment and share your findings in the comments below!
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.. code-block:: yaml
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font:
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- file: 'slkscr.ttf'
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id: font1
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size: 8
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- file: 'BebasNeue-Regular.ttf'
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id: font2
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size: 48
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- file: 'arial.ttf'
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id: font3
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size: 14
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Display Definition
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******************
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Now setup the communication to the display and start fill the screen with live data!
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The ``reset_pin`` was not used in my hardware configuration as the display didn't have that pin exposed.
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Note your ``address`` and ``model`` might be different, use the scan option to find the address of your display.
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.. code-block:: yaml
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i2c:
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sda: D1
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scl: D2
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scan: False
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display:
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- platform: ssd1306_i2c
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model: "SH1106 128x64"
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reset_pin: D0
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address: 0x3C
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lambda: |-
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// Print "Mitt Smarta Hus" in top center.
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it.printf(64, 0, id(font1), TextAlign::TOP_CENTER, "Mitt Smarta Hus");
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// Print time in HH:MM format
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it.strftime(0, 60, id(font2), TextAlign::BASELINE_LEFT, "%H:%M", id(esptime).now());
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// Print inside temperature (from homeassistant sensor)
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if (id(inside_temperature).has_state()) {
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it.printf(127, 23, id(font3), TextAlign::TOP_RIGHT , "%.1f°", id(inside_temperature).state);
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}
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// Print outside temperature (from homeassistant sensor)
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if (id(outside_temperature).has_state()) {
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it.printf(127, 60, id(font3), TextAlign::BASELINE_RIGHT , "%.1f°", id(outside_temperature).state);
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}
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Rendering
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---------
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- Alignment of text can use different reference points, for example ``TOP_RIGHT`` or ``BASELINE_LEFT``, which all are defined in :apiref:`display/display_buffer.h`.
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- The property ``has_state()`` on a sensor is useful as it can take some seconds to get the data from Home Assistant and you may not want to display ``Nan``
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- Refer to the rendering engine :ref:`display-engine` for more features (it can draw lines and circles too!)
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Add a Text-Based Sensor
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-----------------------
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Below follows an example that replaces the "Mitt smarta hem" top printout with the alarm status from the alarm component in Home Assistant.
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.. code-block:: yaml
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text_sensor:
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- platform: homeassistant
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entity_id: alarm_control_panel.my_alarm_system
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name: "Alarm State"
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id: alarm_state
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display:
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- platform: ssd1306_i2c
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model: "SH1106 128x64"
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reset_pin: D0
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address: 0x3C
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lambda: |-
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// Print "Alarm State: <state>" in top center
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it.printf(64, 0, id(font1), TextAlign::TOP_CENTER, "Alarm State: %s", id(alarm_state).state.c_str());
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See Also
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--------
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- :doc:`/components/display/ssd1306`
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- :doc:`/components/display/index`
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- :doc:`/components/sensor/homeassistant`
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- :ghedit:`Edit`
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