circuitpython/examples/rp2/pwm_fade.py

27 lines
543 B
Python

# Example using PWM to fade an LED.
# Note: this does not work on Pico W because it uses Pin(25) for LED output.
import time
from machine import Pin, PWM
# Construct PWM object, with LED on Pin(25).
pwm = PWM(Pin(25))
# Set the PWM frequency.
pwm.freq(1000)
# Fade the LED in and out a few times.
duty = 0
direction = 1
for _ in range(8 * 256):
duty += direction
if duty > 255:
duty = 255
direction = -1
elif duty < 0:
duty = 0
direction = 1
pwm.duty_u16(duty * duty)
time.sleep(0.001)