//toggling of 9 bulb one by one 
from machine import Pin
import time
led_pins_group1 = [5, 4, 0]   
led_pins_group2 = [2, 14, 12] 
led_pins_group3 = [13, 15, 16] 
leds_group1 = [Pin(pin, Pin.OUT) for pin in led_pins_group1]
leds_group2 = [Pin(pin, Pin.OUT) for pin in led_pins_group2]
leds_group3 = [Pin(pin, Pin.OUT) for pin in led_pins_group3]

def toggle_leds(led_group):
    for led in led_group:
        led.value(not led.value())  

while True:

    toggle_leds(leds_group1)
    time.sleep(1) 

    toggle_leds(leds_group2)
    time.sleep(1)
    
   
    toggle_leds(leds_group3)
    time.sleep(1)