import machine
import utime
import urandom
led = machine.Pin(15, machine.Pin.OUT)
button = machine.Pin(16, machine.Pin.IN)

def button_handler(pin):
    button.irq(handler=None)
    print(pin)
    timer_reaction = utime.ticks_diff(utime.ticks_ms(), timer_start)
    
    print("Your reaction time was " + str(timer_reaction) + " milliseconds!")

while True:    
    led.value(1)
    utime.sleep(urandom.uniform(2, 4))
    led.value(0)
    timer_start = utime.ticks_ms()
    button.irq(trigger=machine.Pin.IRQ_RISING, handler=button_handler)
    utime.sleep(3)
    print('new game now\n\n')