Inky

Python library for Inky pHAT, Inky wHAT and Inky Impression e-paper displays for Raspberry Pi.

Inky pHAT

Inky pHAT is a 250x122 pixel e-paper display, available in red/black/white, yellow/black/white and black/white. It's great for nametags and displaying very low frequency information such as a daily calendar or weather overview.

Inky wHAT

Inky wHAT is a 400x300 pixel e-paper display available in red/black/white, yellow/black/white and black/white. It's got tons of resolution for detailed daily to-do lists, multi-day weather forecasts, bus timetables and more.

Inky Impression

Inky Impression is our line of glorious 7 colour eInk displays, available in 4" (640 x 400 pixel) 5.7" (600 x 448 pixel) and 7.3" (800 x 480 pixel) flavours. They're packed with strong colours and perfect for displaying striking graphics or lots of data.

Installation

We'd recommend using this library with Raspberry Pi OS Bookworm or later. It requires Python ≥3.7.

Full install (recommended):

We've created an easy installation script that will install all pre-requisites and get you up and running with minimal efforts. To run it, fire up Terminal which you'll find in Menu -> Accessories -> Terminal on your Raspberry Pi desktop, as illustrated below:

In the new terminal window type the commands exactly as it appears below (check for typos) and follow the on-screen instructions:

git clone https://github.com/pimoroni/inky
cd inky
./install.sh

Note Libraries will be installed in the "pimoroni" virtual environment, you will need to activate it to run examples:

source ~/.virtualenvs/pimoroni/bin/activate

Development:

If you want to contribute, or like living on the edge of your seat by having the latest code, you can install the development version like so:

git clone https://github.com/pimoroni/inky
cd inky
./install.sh --unstable

Install stable library from PyPi and configure manually

• Set up a virtual environment: python3 -m venv --system-site-packages $HOME/.virtualenvs/pimoroni
• Switch to the virtual environment: source ~/.virtualenvs/pimoroni/bin/activate
• Install the library: pip install inky

This will not make any configuration changes, so you may also need to enable:

• i2c: sudo raspi-config nonint do_i2c 0
• spi: sudo raspi-config nonint do_spi 0

You can optionally run sudo raspi-config or the graphical Raspberry Pi Configuration UI to enable interfaces.

Additionally you may need to disable SPI's chip-select to avoid the error:

Woah there, some pins we need are in use!
  ⚠️   Chip Select: (line 8, GPIO8) currently claimed by spi0 CS0

This requires the addition of dtoverlay=spi0-0cs to /boot/firmware/config.txt.

Usage

The library should be run with Python 3.

Auto Setup

Inky can try to automatically identify your board (from the information stored on its EEPROM) and set up accordingly. This is the easiest way to work with recent Inky displays.

from inky.auto import auto
display = auto()

You can then get the colour and resolution from the board:

display.colour
display.resolution

Manual Setup

If you have an older Inky without an EEPROM, you can specify the type manually. The Inky library contains modules for both the pHAT and wHAT, load the Inky pHAT one as follows:

from inky import InkyPHAT

You'll then need to pick your colour, one of 'red', 'yellow' or 'black' and instantiate the class:

display = InkyPHAT('red')

If you're using the wHAT you'll need to load the InkyWHAT class from the Inky library like so:

from inky import InkyWHAT
display = InkyWHAT('red')

Once you've initialised Inky, there are only three methods you need to be concerned with:

Set Image

Set a PIL image, numpy array or list to Inky's internal buffer. The image dimensions should match the dimensions of the pHAT or wHAT you're using.

display.set_image(image)

You should use PIL to create an image. PIL provides an ImageDraw module which allow you to draw text, lines and shapes over your image. See: https://pillow.readthedocs.io/en/stable/reference/ImageDraw.html

Set Border

Set the border colour of you pHAT or wHAT.

display.set_border(colour)

colour should be one of inky.RED, inky.YELLOW, inky.WHITE or inky.BLACK with available colours depending on your display type.

Update The Display

Once you've prepared and set your image, and chosen a border colour, you can update your e-ink display with:

display.show()

Migrating

If you're migrating code from the old inkyphat library you'll find that much of the drawing and image manipulation functions have been removed from Inky. These functions were always supplied by PIL, and the recommended approach is to use PIL to create and prepare your image before setting it to Inky with set_image().