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Light

class Light(port)

LEGO® Powered Up Light.

Parameters:

port (Port) – Port to which the device is connected.

on(brightness=100)

Turns on the light at the specified brightness.

Parameters:

brightness (Number, %) – Brightness of the light.

off()

Turns off the light.

Examples

Making the light blink

from pybricks.pupdevices import Light
from pybricks.parameters import Port
from pybricks.tools import wait

# Initialize the light.
light = Light(Port.A)

# Blink the light forever.
while True:
    # Turn the light on at 100% brightness.
    light.on(100)
    wait(500)

    # Turn the light off.
    light.off()
    wait(500)

Gradually change the brightness

from pybricks.pupdevices import Light
from pybricks.parameters import Port
from pybricks.tools import wait, StopWatch

from umath import pi, cos

# Initialize the light and a StopWatch.
light = Light(Port.A)
watch = StopWatch()

# Cosine pattern properties.
PERIOD = 2000
MAX = 100

# Make the brightness fade in and out.
while True:
    # Get phase of the cosine.
    phase = watch.time() / PERIOD * 2 * pi

    # Evaluate the brightness.
    brightness = (0.5 - 0.5 * cos(phase)) * MAX

    # Set light brightness and wait a bit.
    light.on(brightness)
    wait(10)