import board # pin definitions
import time # time functions
import touchio # capacitivectouch library
import pulseio # pwm library
import adafruit_dotstar # dotstar rgb led library

# One dotstar soldered on the board
dot = adafruit_dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1, brightness=0.2)

# Built in red LED
led = pulseio.PWMOut(board.D13, frequency=5000, duty_cycle=0)
led.duty_cycle = 0 # initially off

# Capacitive touch on A2
touch = touchio.TouchIn(board.A2)

# Helper to give us a nice color swirl
def wheel(pos):
    # Input a value 0 to 255 to get a color value.
    # The colours are a transition r - g - b - back to r.
    if (pos < 0):
        return [0, 0, 0]
    if (pos > 255):
        return [0, 0, 0]
    if (pos < 85):
        return [int(pos * 3), int(255 - (pos*3)), 0]
    elif (pos < 170):
        pos -= 85
        return [int(255 - pos*3), 0, int(pos*3)]
    else:
        pos -= 170
        return [0, int(pos*3), int(255 - pos*3)]

######################### MAIN LOOP ##############################

i = 0 # a variable to keep track of time
while True:
    time.sleep(.01) # wait 0.01 seconds. if this isn't here the code might run too fast
    i = (i+1) % 256  # run from 0 to 255
    dot[0] = wheel(i & 255) # set the color of the dotstar, [red green blue]
    led.duty_cycle = i*255 # duty_cycle can be 0 to 65535
    if i%100==0: # if i is divisible by 100
        # printing at this slow speed because sending too often chokes the computer
        print("A2 touch: %d" % touch.raw_value, end="\n") # print the value of the cap touch sensor on pin A2