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import time from machine import ADC, Pin, idle from neopixel import NeoPixel LEDS = 20 OFFSET = 1449 adc0 = ADC(Pin(10)) np = NeoPixel(Pin(15), LEDS) np.fill((0,0,0)) np.write() class IIRLowPassShift: def __init__(self, shift: int, initial: int=0, offset: int=0): self.shift = shift self.y = initial self.offset = offset def update(self): x = adc0.read_u16() self.y = self.y + ((x - self.y) >> self.shift) return max(0, self.y - self.offset) low_pass = IIRLowPassShift(4, offset=OFFSET) while True: value = low_pass.update() / 65536 * LEDS value, fraction = divmod(value, 1) # print(value, fraction) for i in range(LEDS): if value > i: np[i] = (255, 0, 0) elif fraction: np[i] = (int(fraction * 255), 0, 0) fraction = 0 else: np[i] = (0, 0, 0) np.write() # time.sleep_ms(1) idle()
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