Created
February 29, 2016 19:46
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A Python script to show a "hidden" feature of the Pimoroni Display-o-Tron HAT. Individual backlight LED control: marching hues
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| #!/usr/bin/env python | |
| print(""" | |
| This example shows you a feature of the Dot HAT. | |
| You should see colors step across the screen! | |
| Press CTRL+C to exit. | |
| """) | |
| import dothat.backlight as backlight | |
| import dothat.lcd as lcd | |
| import atexit | |
| import time | |
| def tidyup(): | |
| backlight.off() | |
| lcd.clear() | |
| backlight.graph_off() | |
| atexit.register(tidyup) | |
| lcd.set_cursor_position(0,0) | |
| lcd.write("the hues go marching one by one") | |
| dVal = 0.05 # hue value delta - alter to taste | |
| delta = dVal | |
| hue = 0 # hue to use, range 0..1 | |
| y = 0 | |
| while True: | |
| rgb = backlight.hue_to_rgb(hue) | |
| # there are six RGB LEDs - the % (mod) operator insures range 0-5 | |
| backlight.single_rgb(y % 6, rgb[0], rgb[1], rgb[2]) | |
| y += 1 # next LED | |
| time.sleep(0.5) | |
| # toggle the hue "direction" | |
| hue += delta | |
| if (hue > 1.0): | |
| delta = -dVal | |
| hue = 1.0 | |
| if (hue < 0): | |
| delta = dVal | |
| hue = 0 |
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