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