examples/lcd.py

   1 #!/usr/bin/env python3
   2
   3 import ST7735
   4 from PIL import Image, ImageDraw, ImageFont
   5 from fonts.ttf import RobotoMedium as UserFont
   6 import logging
   7
   8 logging.basicConfig(
   9     format='%(asctime)s.%(msecs)03d %(levelname)-8s %(message)s',
  10     level=logging.INFO,
  11     datefmt='%Y-%m-%d %H:%M:%S')
  12
  13 logging.info("""lcd.py - Hello, World! example on the 0.96" LCD.
  14
  15 Press Ctrl+C to exit!
  16
  17 """)
  18
  19 # Create LCD class instance.
  20 disp = ST7735.ST7735(
  21     port=0,
  22     cs=1,
  23     dc=9,
  24     backlight=12,
  25     rotation=270,
  26     spi_speed_hz=10000000
  27 )
  28
  29 # Initialize display.
  30 disp.begin()
  31
  32 # Width and height to calculate text position.
  33 WIDTH = disp.width
  34 HEIGHT = disp.height
  35
  36 # New canvas to draw on.
  37 img = Image.new('RGB', (WIDTH, HEIGHT), color=(0, 0, 0))
  38 draw = ImageDraw.Draw(img)
  39
  40 # Text settings.
  41 font_size = 25
  42 font = ImageFont.truetype(UserFont, font_size)
  43 text_colour = (255, 255, 255)
  44 back_colour = (0, 170, 170)
  45
  46 message = "Hello, World!"
  47 size_x, size_y = draw.textsize(message, font)
  48
  49 # Calculate text position
  50 x = (WIDTH - size_x) / 2
  51 y = (HEIGHT / 2) - (size_y / 2)
  52
  53 # Draw background rectangle and write text.
  54 draw.rectangle((0, 0, 160, 80), back_colour)
  55 draw.text((x, y), message, font=font, fill=text_colour)
  56 disp.display(img)
  57
  58 # Keep running.
  59 try:
  60     while True:
  61         pass
  62
  63 # Turn off backlight on control-c
  64 except KeyboardInterrupt:
  65     disp.set_backlight(0)