from machine import Pin,PWM
from time import sleep

pwm = PWM(Pin(14),freq=50)
push = Pin(13,Pin.IN,Pin.PULL_DOWN)
var = 0

while(1):
    if push.value() == 1:
        var = var+1
        if var>2:
            var=0
        while(push.value() == 1):
            sleep(0.01)
    
    if var == 0:
        pwm.duty(25),sleep(0.2)
        pwm.duty(35),sleep(0.2)
    
    elif var == 1:
        pwm.duty(70),sleep(0.2)
        pwm.duty(80),sleep(0.2)
    
    else:
        pwm.duty(115),sleep(0.2)
        pwm.duty(125),sleep(0.2)