68 lines
1.4 KiB
Python
68 lines
1.4 KiB
Python
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# SPDX-FileCopyrightText: 2021 Sandy Macdonald
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#
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# SPDX-License-Identifier: MIT
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# This example displays a rainbow animation on Keybow 2040's keys.
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import time
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import math
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import board
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from keybow2040 import Keybow2040, number_to_xy
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def hsv_to_rgb(h, s, v):
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# Convert an HSV (0.0-1.0) colour to RGB (0-255)
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if s == 0.0:
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rgb = [v, v, v]
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i = int(h * 6.0)
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f = (h*6.)-i; p,q,t = v*(1.-s), v*(1.-s*f), v*(1.-s*(1.-f)); i%=6
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if i == 0:
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rgb = [v, t, p]
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if i == 1:
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rgb = [q, v, p]
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if i == 2:
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rgb = [p, v, t]
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if i == 3:
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rgb = [p, q, v]
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if i == 4:
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rgb = [t, p, v]
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if i == 5:
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rgb = [v, p, q]
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rgb = (int(c * 255) for c in rgb)
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return rgb
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# Set up Keybow
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i2c = board.I2C()
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keybow = Keybow2040(i2c)
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keys = keybow.keys
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# Increment step to shift animation across keys.
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step = 0
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while True:
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# Always remember to call keybow.update() on every iteration of your loop!
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keybow.update()
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step += 1
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for i in range(16):
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# Convert the key number to an x/y coordinate to calculate the hue
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# in a matrix style-y.
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x, y = number_to_xy(i)
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# Calculate the hue.
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hue = (x + y + (step / 20)) / 8
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hue = hue - int(hue)
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hue = hue - math.floor(hue)
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# Convert the hue to RGB values.
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r, g, b = hsv_to_rgb(hue, 1, 1)
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# Display it on the key!
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keys[i].set_led(r, g, b)
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