from machine import Pin
from utime import sleep
LCD1 = Pin(3,Pin.OUT)
LCD2 = Pin(4,Pin.OUT)
LCD3 = Pin(5,Pin.OUT)
while True:
LCD1.on()
LCD2.off()
LCD3.off()
sleep(1)
LCD1.off()
LCD2.on()
LCD3.off()
sleep(1)
LCD1.off()
LCD2.off()
LCD3.on()
sleep(1)