from machine import Pin
from time import sleep

ledr = Pin(2,Pin.OUT)  
ledj = Pin(15,Pin.OUT)
ledv = Pin(0,Pin.OUT) 
    ledv.off()
    ledj.off()
    ledr.off() 
while True:
    ledv.on()
    ledj.off()
    ledr.off()                           
    sleep(1)
    ledv.off()
    ledj.on()
    ledr.off()
    sleep(1)                    
    ledv.off()
    ledj.off()
    ledr.on() 
    sleep(1)