# Exercise 12(c)

from machine import Pin, ADC, Timer
from neopixel import NeoPixel
from time import sleep

# set colours all to zero initially
red=0
green=0
blue=0


def my_timer_ISR (timer): # internal interrupt service routine (ISR)
    global red,green,blue
    red = int(pot1.read()/16)
    green = int(pot2.read()/16)
    blue = int(pot3.read()/16)

my_timer = Timer(0)

my_timer.init(mode = Timer.PERIODIC, period = 100, callback = my_timer_ISR )



# Initialize 16-pixel ring on GPIO pin 12
ring = NeoPixel(Pin(12), 16)

pot1 = ADC(Pin(36)) # pin 36 will be used as an ADC input line
pot2 = ADC(Pin(39)) # pin 39 will be used as an ADC input line
pot3 = ADC(Pin(34)) # pin 34 will be used as an ADC input line



while True:
    for i in range(16):
        ring[i] = (red, green, blue) 
        ring.write()
        sleep(0.25)