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30 lines
821 B
Python
30 lines
821 B
Python
from pybricks.pupdevices import UltrasonicSensor
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from pybricks.parameters import Port
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from pybricks.tools import wait, StopWatch
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from umath import pi, sin
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# Initialize the sensor.
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eyes = UltrasonicSensor(Port.A)
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# Initialize a timer.
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watch = StopWatch()
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# We want one full light cycle to last three seconds.
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PERIOD = 3000
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while True:
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# The phase is where we are in the unit circle now.
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phase = watch.time()/PERIOD*2*pi
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# Each light follows a sine wave with a mean of 50, with an amplitude of 50.
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# We offset this sine wave by 90 degrees for each light, so that all the
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# lights do something different.
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brightness = [sin(phase + offset*pi/2) * 50 + 50 for offset in range(4)]
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# Set the brightness values for all lights.
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eyes.lights.on(brightness)
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# Wait some time.
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wait(50)
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