examples/noise-profile.py

   1 import ST7735
   2 from PIL import Image, ImageDraw
   3 from enviroplus.noise import Noise
   4
   5 print("""noise-profile.py - Get a simple noise profile.
   6
   7 This example grabs a basic 3-bin noise profile of low, medium and high frequency noise, plotting the noise characteristics as coloured bars.
   8
   9 Press Ctrl+C to exit!
  10
  11 """)
  12
  13 noise = Noise()
  14
  15 disp = ST7735.ST7735(
  16         port=0,
  17         cs=ST7735.BG_SPI_CS_FRONT,
  18         dc=9,
  19         backlight=12,
  20         rotation=90)
  21
  22 disp.begin()
  23
  24 img = Image.new('RGB', (disp.width, disp.height), color=(0, 0, 0))
  25 draw = ImageDraw.Draw(img)
  26
  27
  28 while True:
  29     low, mid, high, amp = noise.measure()
  30     low *= 128
  31     mid *= 128
  32     high *= 128
  33     amp *= 64
  34
  35     img2 = img.copy()
  36     draw.rectangle((0, 0, disp.width, disp.height), (0, 0, 0))
  37     img.paste(img2, (1, 0))
  38     draw.line((0, 0, 0, amp), fill=(int(low), int(mid), int(high)))
  39
  40     disp.display(img)