from machine import Pin
import time

for i in range(0,16):
    Pin(i, Pin.OUT).off()

while True:
    for i in range(0,16):
        Pin(i, Pin.OUT).on()
    time.sleep(0.1);
    for i in range(0,16):
        Pin(i, Pin.OUT).off()
    time.sleep(0.1);