from machine import Pin
import time

led1 = Pin(15,Pin.OUT)
led2 = Pin(14,Pin.OUT)
led3 = Pin(13,Pin.OUT)

def turn_off_all():
    led1.value(0)
    led2.value(0)
    led3.value(0)

choice=input("Do you want to turn on light? (y/n): ")
stop=input("type stop to make program end: ")
while choice=="y": 
  
  led1.toggle()
  time.sleep(0.5)

  led2.toggle()
  time.sleep(1)

  led3.toggle()
  time.sleep(1.5)

if stop=="stop":
   turn_off_all()
    print("Program ended.")