import board
import pwmio
ledpin = pwmio.PWMOut(board.LED, frequency=25000, duty_cycle=0)
ledpin.duty_cycle = 32768 # mid-point 0-65535 = 50 % duty-cycleThe brightness of the LED light can be controlled by controlling the PWM duty cycle. The control duty cycle is from 0% to 100%, using 16-bit precision, 0 to 65535 in decimal and 0 to FFFF in hexadecimal. Enter the following code in the REPL:
import board
import pwmio
ledpin = pwmio.PWMOut(board.LED, frequency=25000, duty_cycle=0)
ledpin.duty_cycle = 32768 # mid-point 0-65535 = 50 % duty-cycleJust enter the last line of code again in the REPL to change the PWM duty cycle to bring the LED to maximum brightness:
ledpin.duty_cycle = 65535Use while and for loops to make breathing lights:
import board
import pwmio
import time
ledpin = pwmio.PWMOut(board.LED, frequency=25000, duty_cycle=0)
while True:
for i in range(0, 65535, 1):
ledpin.duty_cycle = i
for i in range(65535, 0, -1):
ledpin.duty_cycle = i