from machine import Pin
import time
led1 = Pin(2, Pin.OUT)
led2 = Pin(15, Pin.OUT)
led3 = Pin(4, Pin.OUT)
while True:
    led1.on()
    print("LED ON")
    time.sleep_ms(2000)
    led1.off()
    print("LED OFF")
    time.sleep_ms(500)
    led2.on()
    print("LED ON")
    time.sleep_ms(1000)
    led2.off()
    print("LED OFF")
    time.sleep_ms(1000)
    led3.on()
    print("LED ON")
    time.sleep_ms(3000)
    led3.off()
    print("LED OFF")
    time.sleep_ms(1000)