import time
from machine import Pin
from machine import ADC

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

leds = [ Pin(i, Pin.OUT) for i in range(4, 12) ]

def trcece(t):
    for led in leds[:-1]:
        led.on()
        time.sleep(t)
        led.off()
    time.sleep(t)
    for led in leds:
        led.on()
    for i in range(7, -1, -1):
        time.sleep(t)
        leds[i].off()

pot_met = ADC(28)


# while True:

#     for led in leds[:-1]:
#         led.on()
#         time.sleep(t)
#         led.off()
#     time.sleep(t)
#     for led in leds:
#         led.on()
#     for i in range(7, -1, -1):
#         time.sleep(t)
#         leds[i].off()

smjer = 1
led_num = 0

tick = 0
promjena = False
adc_stara = pot_met.read_u16() 
t = 0.1 + adc_stara * 1.9 / 65535
while True:
    adc = pot_met.read_u16()
    print(t)
    if (adc_stara != adc):
        time.sleep(0.1)
        adc_stara = adc
        t = 0.1 + adc_stara * 1.9 / 65535

    leds[led_num].on()
    time.sleep(t)
    leds[led_num].off()

    led_num += smjer
    
    if led_num == 7:
        for led in leds:
            led.on()
        smjer *= -1
    elif led_num == 0:
        smjer *= -1