import board
import digitalio
import time                                    #To implement timer

leds = [None] * 4
leds[0] = digitalio.DigitalInOut(board.GP0)     # Selecting which pin is which
leds[0].direction = digitalio.Direction.OUTPUT  # Selecting it as an output

while True:                                     # Forever
  for i in range(1):                            # For each LED
    leds[i].value = True                        # Turn LED on
    time.sleep(1)                               # Wait 1 second
    leds[i].value = False                       # Turn LED off