# A short program to sequentially turn on 8 LEDs
# connected to GPIO 18, 19, 20, 21, 22, 26, 27, 28
# for a quarter of a second and then turn them off
# and reverse the procedure
#
#
#
# Import the modules used in the script
import time
import machine
 
# Define Constants
NUM_LEDS = 8
led_list = [18, 19, 20, 21, 22, 26, 27, 28]
 
# Configure the GPIO to BCM numbering scheme and set pins to output mode
for x in range(NUM_LEDS):
    led_pin = machine.Pin(led_list[x], machine.Pin.OUT)
    led_pin.off()  # Set initial state to LOW (off)

print("Sequential LED Sequence")
print("Press CTRL + C to quit.")

# Main loop
try:
    while True:
        for x in range(NUM_LEDS):
            led_pin = machine.Pin(led_list[x], machine.Pin.OUT)
            led_pin.on()  # Turn LED on
            time.sleep(0.25)
            led_pin.off()  # Turn LED off

# If CTRL+C is pressed, the main loop is broken
except KeyboardInterrupt:
    print("Quitting")

# Clean up GPIO pins
for x in range(NUM_LEDS):
    led_pin = machine.Pin(led_list[x], machine.Pin.OUT)
    led_pin.off()  # Turn off all LEDs