import utime
utime.sleep(0.3)

import machine
led=machine.Pin(21,machine.Pin.OUT)
button=machine.Pin(15,machine.Pin.IN,machine.Pin.PULL_UP)
while 1:
    stat=button.value() #read button value
    if stat==0:
        led.value(1) # on led
        print("led is on")
    else:
        led.value(0) # off led
        print("led is off")
    utime.sleep(0.3)