import time
import pyfirmata

# start connection to Arduino
#  USB: /dev/ttyUSB0 or /dev/ttyACM0
board = pyfirmata.Arduino('/dev/ttyACM0')

board.digital[25].write(1)  # LED on
time.sleep(1)               # 1s delay
board.digital[25].write(0)  # LED off
time.sleep(1)               # 1s delay
board.exit()                # exit
