81 lines
1.8 KiB
Python
81 lines
1.8 KiB
Python
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from pimoroni_i2c import PimoroniI2C
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from breakout_encoder import BreakoutEncoder
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import plasma
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from plasma import plasma2040
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"""
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Change the colour of your LEDs easily by hooking up an RGB Encoder Breakout!
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"""
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# set how many LEDs you have
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NUM_LEDS = 50
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# make this number bigger for more precise colour adjustments
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STEPS_PER_REV = 24
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PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
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i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
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enc = BreakoutEncoder(i2c)
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enc.set_brightness(1.0)
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# enc.set_direction(BreakoutEncoder.DIRECTION_CCW) # Uncomment this to flip the direction
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def hsv_to_rgb(h, s, v):
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# From CPython Lib/colorsys.py
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if s == 0.0:
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return v, v, v
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i = int(h * 6.0)
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f = (h * 6.0) - i
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p = v * (1.0 - s)
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q = v * (1.0 - s * f)
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t = v * (1.0 - s * (1.0 - f))
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i = i % 6
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if i == 0:
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return v, t, p
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if i == 1:
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return q, v, p
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if i == 2:
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return p, v, t
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if i == 3:
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return p, q, v
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if i == 4:
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return t, p, v
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if i == 5:
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return v, p, q
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def count_changed(count):
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print("Count: ", count, sep="")
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h = ((count % STEPS_PER_REV) * 360.0) / STEPS_PER_REV # Convert the count to a colour hue
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r, g, b = [int(255 * c) for c in hsv_to_rgb(h / 360.0, 1.0, 1.0)] # rainbow magic
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# set the encoder LED colour
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enc.set_led(r, g, b)
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# set the led strip to match
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for i in range(NUM_LEDS):
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led_strip.set_rgb(i, r, g, b)
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# WS2812 / NeoPixel™ LEDs
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led_strip = plasma.WS2812(NUM_LEDS, 0, 0, plasma2040.DAT)
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# Start updating the LED strip
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led_strip.start()
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count = 0
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count_changed(count)
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enc.clear_interrupt_flag()
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while True:
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if enc.get_interrupt_flag():
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count = enc.read()
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enc.clear_interrupt_flag()
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while count < 0:
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count += STEPS_PER_REV
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count_changed(count)
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