from machine import Pin,PWM
from time import sleep
frequency =1000
sw1=Pin(12,Pin.IN)
led1=Pin(5,Pin.OUT)
sw2=Pin(12,Pin.IN)
led2=Pin(5,Pin.OUT)
#led=PWM(Pin(5),frequency)
#led1=PWM(Pin(18),frequency)
while True:
    for duty_cycle in range(0,1023 , 5):
        led.duty(duty_cycle)
        sleep(0.005)
    for duty_cycle in range(1023,0,-5):
        led.duty(duty_cycle)
        sleep(0.005)