from machine import Pin, PWM<br>
from time import sleep<br>

pwm = PWM(Pin(15))<br>

pwm.freq(1000)<br>

while True:<br>
    for duty in range(65025):<br>
		pwm.duty_u16(duty)<br>
		sleep(0.0001)<br>
	for duty in range(65025, 0, -1):<br>
		pwm.duty_u16(duty)<br>
		sleep(0.0001)<br>