from machine import Pin, PWM
from neopixel import Neopixel

from time import sleep,sleep_ms

# General settings
VOLUME = 100  # PWM duty cycle

# Define the LED matrix "display"
PIN_MATRIX = 3
N_ROWS = 8
N_COLUMNS = 16
N_MATRIX = N_ROWS*N_COLUMNS
matrix = Neopixel(N_MATRIX, 0, PIN_MATRIX, "GRB")

# Define the environment temperature "gauge"
PIN_GAUGE = 28
N_GAUGE = 8
gauge = Neopixel(N_GAUGE, 1, PIN_GAUGE, "GRB")

# Set up the button for pi pulse
btn = Pin(27, Pin.IN, Pin.PULL_DOWN)
# TODO: debounce with timeout or sth, e.g.
# https://www.elektronik-kompendium.de/sites/raspberry-pi/2612181.htm
def on_pressed(pin):
    play_tone(300, 100)
btn.irq(trigger=Pin.IRQ_RISING, handler=on_pressed)  # interrupt request when pressed

# Set up the buzzer for playing sound
pwm = PWM(Pin(16))
pwm.duty_u16(0)  # turn off initially

def play_tone(freq, duration):
  pwm.freq(freq)
  pwm.duty_u16(VOLUME)
  sleep_ms(duration)
  pwm.duty_u16(0)


##
# Main Loop
##

while True:
  # Light matrix leds one-by-one
  for i in range(N_MATRIX):
    matrix.set_pixel(i, (255, 0, 0))
    matrix.show()
    #play_tone(500 if (i%4)==0 else 300, 100)
    sleep_ms(100)
    # Increase the gauge every 2 columns of the matrix
    if i%(N_ROWS*2) == 0:
      gauge.set_pixel(i//(N_ROWS*2), (0, 0, 255))
      gauge.show()

  # Turn off all LEDs
  for i in range(N_MATRIX):
    matrix.set_pixel(i, (0, 0, 0))
  for i in range(N_GAUGE):
    gauge.set_pixel(i, (0, 0, 0))
  matrix.show()
  gauge.show()
  sleep_ms(100)