kopia lustrzana https://github.com/pimoroni/pimoroni-pico
56 wiersze
1.4 KiB
Python
56 wiersze
1.4 KiB
Python
import plasma
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from plasma import plasma_stick
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import breakout_scd41 as scd
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from pimoroni_i2c import PimoroniI2C
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"""
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Reads CO2 level from an SCD41 breakout...
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... and changes the LED strip an appropriate colour.
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https://shop.pimoroni.com/products/scd41-co2-sensor-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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BRIGHTNESS = 1.0
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# the range of readings to map to colours
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# https://www.kane.co.uk/knowledge-centre/what-are-safe-levels-of-co-and-co2-in-rooms
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MIN = 400
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MAX = 2000
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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 = 100 # green
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HUE_END = 0 # red
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# WS2812 / NeoPixel™ LEDs
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led_strip = plasma.WS2812(NUM_LEDS, 0, 0, plasma_stick.DAT, color_order=plasma.COLOR_ORDER_RGB)
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# Start updating the LED strip
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led_strip.start()
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# set up I2C
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i2c = PimoroniI2C(plasma_stick.SDA, plasma_stick.SCL)
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# set up SCD41 breakout
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scd.init(i2c)
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scd.start()
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print("Waiting for SCD41 to be ready")
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while True:
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if scd.ready():
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co2, temperature, humidity = scd.measure()
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print(f"""
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CO2: {co2} ppm
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Temperature: {temperature:.2f} °C
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Humidity: {humidity:.2f} %""")
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# calculates a colour
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hue = HUE_START + ((co2 - 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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