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December 21, 2020 06:17
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Interfacing E-Ink Display Using Raspberry Pi
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# E-Ink: | |
# - https://my.cytron.io/p-2.9-inch-e-ink-raw-display-panel-tri-color?tracking=idris | |
# - https://my.cytron.io/p-universal-e-paper-raw-panel-driver-hat?tracking=idris | |
# | |
# References: | |
# - https://learn.adafruit.com/2-13-in-e-ink-bonnet/usage | |
# - https://gist.github.com/ScientificProgrammer/bd08a1474c6e5f0a8f102b35ac2533f1 | |
import time | |
import digitalio | |
import busio | |
import board | |
from PIL import Image, ImageDraw, ImageFont | |
from adafruit_epd.epd import Adafruit_EPD | |
from adafruit_epd.il0373 import Adafruit_IL0373 | |
# First define some color constants | |
WHITE = (0xFF, 0xFF, 0xFF) | |
BLACK = (0x00, 0x00, 0x00) | |
RED = (0xFF, 0x00, 0x00) | |
# Next define some constants to allow easy resizing of shapes and colors | |
BORDER = 20 | |
FONTSIZE = 24 | |
BACKGROUND_COLOR = RED | |
FOREGROUND_COLOR = WHITE | |
TEXT_COLOR = BLACK | |
spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO) | |
ecs = digitalio.DigitalInOut(board.CE0) | |
dc = digitalio.DigitalInOut(board.D25) | |
rst = digitalio.DigitalInOut(board.D17) | |
busy = digitalio.DigitalInOut(board.D24) | |
srcs = None | |
display = Adafruit_IL0373( | |
128, 296, spi, | |
cs_pin=ecs, | |
dc_pin=dc, | |
sramcs_pin=srcs, | |
rst_pin=rst, | |
busy_pin=busy | |
) | |
display.rotation = 3 | |
image = Image.new("RGB", (display.width, display.height)) | |
# Get drawing object to draw on image. | |
draw = ImageDraw.Draw(image) | |
# Draw a filled box as the background | |
draw.rectangle( | |
(0, 0, display.width, display.height), | |
fill=BACKGROUND_COLOR | |
) | |
# Draw a smaller inner foreground rectangle | |
draw.rectangle( | |
(BORDER, BORDER, display.width - BORDER - 1, display.height - BORDER - 1), | |
fill=FOREGROUND_COLOR, | |
) | |
# Load a TTF Font | |
font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", FONTSIZE) | |
# Draw Some Text | |
text = "Hello World!" | |
(font_width, font_height) = font.getsize(text) | |
draw.text( | |
(display.width // 2 - font_width // 2, display.height // 2 - font_height // 2), | |
text, | |
font=font, | |
fill=TEXT_COLOR, | |
) | |
# Display image. | |
display.image(image) | |
display.display() | |
time.sleep(180) | |
draw.rectangle( | |
(0, 0, display.width, display.height), | |
fill=FOREGROUND_COLOR | |
) | |
display.image(image) | |
display.display() |
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