print("Let's make external LED Blink")
print("Date: 21/11/2023")
print('Created by AHH')

#Import libraries
from machine import Pin
from time import sleep

#Pin declaration
external_LED1 = Pin (13, Pin.OUT) #(gpio pin no, IN or OUT)
external_LED2 = Pin (12, Pin.OUT) #(gpio pin no, IN or OUT)
external_LED3 = Pin (14, Pin.OUT) #(gpio pin no, IN or OUT)
external_LED4 = Pin (27, Pin.OUT) #(gpio pin no, IN or OUT)

#Parameter setting

#Main program
while True:
  external_LED1.off()
  external_LED2.on()
  external_LED3.off()
  external_LED4.on()
  sleep(0.5)

  external_LED1.on()
  external_LED2.off()
  external_LED3.on()
  external_LED4.off()
  sleep(0.5)

  external_LED1.off()
  external_LED2.on()
  external_LED3.off()
  external_LED4.on()
  sleep(0.5)

  external_LED1.on()
  external_LED2.off()
  external_LED3.on()
  external_LED4.off()
  sleep(0.5)