from machine import Pin
from time import sleep

L1 = Pin(13, Pin.OUT)
L2 = Pin(12, Pin.OUT)
L3 = Pin(14, Pin.OUT)

# 2^3 -> 8 Combination - 3 Bit Binary Counter
# 0 -> 000
# 1 -> 001
# 2 -> 010
# 3 -> 011
# 4 -> 100
# 5 -> 101
# 6 -> 110
# 7 -> 111

while True:
  #  For 0
  L1.off()
  L2.off()
  L3.off()
  sleep(2)

  #  For 1
  L1.off()
  L2.off()
  L3.on()
  sleep(2)

  #  For 2
  L1.off()
  L2.on()
  L3.off()
  sleep(2)

  #  For 3
  L1.off()
  L2.on()
  L3.on()
  sleep(2)

  #  For 4
  L1.on()
  L2.off()
  L3.off()
  sleep(2)