53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
import analogio
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import board
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import neopixel
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# Initialize input/output pins
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sensor_pin = board.A1 # input pin for the potentiometer
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sensor = analogio.AnalogIn(sensor_pin)
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pix_pin = board.D1 # pin where NeoPixels are connected
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num_pix = 8 # number of neopixels
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strip = neopixel.NeoPixel(pix_pin, num_pix, brightness=.15, auto_write=False)
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color_value = 0
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sensor_value = 0
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def wheel(pos):
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# Input a value 0 to 255 to get a color value.
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# The colours are a transition r - g - b - back to r.
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if (pos < 0) or (pos > 255):
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return 0, 0, 0
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if pos < 85:
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return int(pos * 3), int(255 - (pos * 3)), 0
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elif pos < 170:
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pos -= 85
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return int(255 - pos * 3), 0, int(pos * 3)
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pos -= 170
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return 0, int(pos * 3), int(255 - pos * 3)
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def remap_range(value, left_min, left_max, right_min, right_max):
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# this remaps a value from original (left) range to new (right) range
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# Figure out how 'wide' each range is
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left_span = left_max - left_min
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right_span = right_max - right_min
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# Convert the left range into a 0-1 range (int)
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valueScaled = int(value - left_min) / int(left_span)
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# Convert the 0-1 range into a value in the right range.
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return int(right_min + (valueScaled * right_span))
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# Loop forever...
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while True:
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# remap the potentiometer analog sensor values from 0-65535 to RGB 0-255
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color_value = remap_range(sensor.value, 0, 65535, 0, 255)
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for i in range(len(strip)):
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strip[i] = wheel(color_value)
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strip.write()
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