# Exercise 12(b)

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

# 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

r=1000
direction = True
switch = Pin(19,Pin.IN,Pin.PULL_UP)  # configure the target GPIO line as an input


def My_ISR(pin): # Interrupt Service Routine (ISR)
    global direction,r # global variable the ISR code can update
    
    if direction ==True: 
        direction =False
    else:
        direction =True
    
    print(f'Direction: {direction}')
    r=r+1
    print(r)

# Attach the interrupt to the GPIO line using the irq() method
switch.irq(handler= My_ISR, trigger = Pin.IRQ_FALLING)

position = 0
while True:
    pot1_value = int(pot1.read()/16)
    #print(pot1_value)
    pot2_value = int(pot2.read()/16)
    #print(pot2_value)
    pot3_value = int(pot3.read()/16)
    #print(pot3_value)

    
 

   
    if direction==True:
        position=position+1
        if position==16:
            position=0
        ring[position] = (pot1_value, pot2_value, pot3_value) # Set pixel 0 to red
        
    else:
        position=position-1
        if position==-1:
            position=15
        ring[position] = (pot1_value, pot2_value, pot3_value) # Set pixel 0 to red
        
    # Update all pixels simultaneously
    ring.write()
    sleep(.2)