from machine import Pin,PWM,Timer
import time

cuenta=0

p32 = Pin(32, Pin.OUT)  #TRIG
p33 = Pin(33, Pin.IN)   #ECHO
p25 = Pin(25, Pin.OUT)   
p26 = Pin(26, Pin.OUT) 
p27 = Pin(27, Pin.IN)  
p14 = Pin(14, Pin.OUT)    
p12 = Pin(12, Pin.OUT)   


    p32.on()
    time.sleep_us(12)
    p32.off()
    if p33.value()=0:
        cuenta+=1