from machine import Pin
import utime
trig=Pin(0,Pin.OUT, value=0)
echo =Pin(1,Pin.IN)
RelayIn=Pin(2,Pin.OUT,value=0)
RelayOut=Pin(3,Pin.OUT,value=0)
button =Pin(4,Pin.IN,Pin.PULL_UP)  
D=320
h=0
def ultrason ():
    t=Toff=Ton=distance=0
    trig.on()
    utime.sleep_us(10)
    trig.off()
    while echo.value()==0:
        Toff=utime.ticks_us()
    while echo.value()==1:
        Ton=utime.ticks_us()
    t=(Ton-Toff)/2
    distance=t*0.034
    h=320-distance
    Hpercent=int (h*(100/300))  
    print(button .value())  
    if 210<h<=270:
        RelayIn.on()
        RelayOut.off()
    elif h <=210:
        RelayOut.off()
        RelayIn.on()
    else:
        RelayIn.off()
        RelayOut.on()
# void loop
while 1:
    while button.value()==0:
        ultrason()
        utime.sleep_ms(50)
    else:
        pass