kopia lustrzana https://github.com/pimoroni/pimoroni-pico
65 wiersze
1.8 KiB
Python
65 wiersze
1.8 KiB
Python
import plasma
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from plasma import plasma2040
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import machine
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import time
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"""
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Reads the internal temperature sensor on the Pico W...
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... and changes the LED strip an appropriate colour.
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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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BRIGHTNESS = 1.0
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# The range of readings that we want to map to colours
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MIN = 10
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MAX = 30
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# pick what bits of the colour wheel to use (from 0-360°)
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# https://www.cssscript.com/demo/hsv-hsl-color-wheel-picker-reinvented/
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HUE_START = 230 # blue
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HUE_END = 359 # red
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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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sensor_temp = machine.ADC(4)
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conversion_factor = 3.3 / (65535) # used for calculating a temperature from the raw sensor reading
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# The Pico's temperature sensor is not super accurate and readings jump around
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# lets do some averaging to avoid annoying flashing
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n = 0
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temperature = 20 # a dummy value to fill the array
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temperature_array = [temperature] * 10 # average over 10 readings (5 secs)
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while True:
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# read the sensor
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# the following two lines do some maths to convert the number from the temp sensor into celsius
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reading = sensor_temp.read_u16() * conversion_factor
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temperature = 27 - (reading - 0.706) / 0.001721
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# add the most recent reading to the array
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if n >= len(temperature_array):
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n = 0
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temperature_array[n] = temperature
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n += 1
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temperature_average = sum(temperature_array) / len(temperature_array)
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print(f"""
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Average temperature: {temperature_average:.2f} °C
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""")
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# calculates a colour
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hue = HUE_START + ((temperature_average - MIN) * (HUE_END - HUE_START) / (MAX - MIN))
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# set the leds
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for i in range(NUM_LEDS):
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led_strip.set_hsv(i, hue / 360, 1.0, BRIGHTNESS)
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time.sleep(0.5)
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