Introduction

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CircuitPython displayio driver for EK79686-based ePaper displays

Dependencies

This driver depends on:

• Adafruit CircuitPython <https://github.com/adafruit/circuitpython>_

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle <https://circuitpython.org/libraries>_ or individual libraries can be installed using circup <https://github.com/adafruit/circup>_.

Installing from PyPI

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI <https://pypi.org/project/adafruit-circuitpython-ek79686/>_. To install for current user:

.. code-block:: shell

pip3 install adafruit-circuitpython-ek79686

To install system-wide (this may be required in some cases):

.. code-block:: shell

sudo pip3 install adafruit-circuitpython-ek79686

To install in a virtual environment in your current project:

.. code-block:: shell

mkdir project-name && cd project-name
python3 -m venv .venv
source .env/bin/activate
pip3 install adafruit-circuitpython-ek79686

Installing to a Connected CircuitPython Device with Circup

Make sure that you have circup installed in your Python environment. Install it with the following command if necessary:

.. code-block:: shell

pip3 install circup

With circup installed and your CircuitPython device connected use the following command to install:

.. code-block:: shell

circup install adafruit_ek79686

Or the following command to update an existing version:

.. code-block:: shell

circup update

Usage Example

.. code-block:: python

import time
import board
import displayio
import adafruit_ek79686

# Used to ensure the display is free in CircuitPython
displayio.release_displays()

# Define the pins needed for display use on the Metro
spi = board.SPI()
epd_cs = board.D10
epd_dc = board.D9
epd_reset = board.D5
epd_busy = board.D6

# Create the displayio connection to the display pins
display_bus = displayio.FourWire(
    spi, command=epd_dc, chip_select=epd_cs, reset=epd_reset, baudrate=1000000
)
time.sleep(1)  # Wait a bit

# Create the display object - the third color is red (0xff0000)
display = adafruit_ek79686.EK79686(
    display_bus,
    width=264,
    height=176,
    busy_pin=epd_busy,
    highlight_color=0xFF0000,
    rotation=90,
)

# Create a display group for our screen objects
g = displayio.Group()


# Display a ruler graphic from the root directory of the CIRCUITPY drive
with open("/display-ruler.bmp", "rb") as f:
    pic = displayio.OnDiskBitmap(f)
    # Create a Tilegrid with the bitmap and put in the displayio group
    # CircuitPython 6 & 7 compatible
    t = displayio.TileGrid(
        pic, pixel_shader=getattr(pic, "pixel_shader", displayio.ColorConverter())
    )
    # CircuitPython 7 compatible only
    # t = displayio.TileGrid(pic, pixel_shader=pic.pixel_shader)
    g.append(t)

    # Place the display group on the screen (does not refresh)
    display.show(g)

    # Show the image on the display
    display.refresh()

    print("refreshed")

    # Do Not refresh the screen more often than every 180 seconds
    #   for eInk displays! Rapid refreshes will damage the panel.
    time.sleep(180)

Documentation

API documentation for this library can be found on Read the Docs <https://docs.circuitpython.org/projects/ek79686/en/latest/>_.

For information on building library documentation, please check out this guide <https://learn.adafruit.com/creating-and-sharing-a-circuitpython-library/sharing-our-docs-on-readthedocs#sphinx-5-1>_.

Contributing

Contributions are welcome! Please read our Code of Conduct <https://github.com/adafruit/Adafruit_CircuitPython_EK79686/blob/HEAD/CODE_OF_CONDUCT.md>_ before contributing to help this project stay welcoming.