import time
import machine
from machine import Pin

time.sleep(0.1) # Wait for USB to become ready

G = Pin(12, Pin.OUT)
B = Pin(13, Pin.OUT) 
R = Pin(14, Pin.OUT)

i = 1
korak = -1
while (True):
    print(i * 0.1)
    for boja in range(1, 8):
        G.value(boja & 1)
        B.value((boja >> 1) & 1)
        R.value((boja >> 2) & 1)
        time.sleep(i * 0.1)

    if ((i - 1) % 9 == 0):
        korak *= -1
    i += korak