# write a micro python program to read he touch value from gpio4 
#every half second,and print the touch value on the shell window


from machine import TouchPad,Pin
from time import sleep
led=Pin(18,Pin.OUT)
switch=TouchPad(Pin(4,Pin.IN))
while True:
    x=switch.read()
    if x<400:
        while True:
            led.on()
            sleep(1)
            led.off()
            sleep(1)
    else: 
        led.off()