from machine import Pin, PWM
from time import *
from pin_numbers import *

print('RGB LED PWM Example')
print('press the button to toggle between 2 LEDs')

r_led = PWM(Pin(D2))
g_led = PWM(Pin(D1))
b_led = Pin(D0, Pin.OUT)
btn = Pin(D8, Pin.IN, Pin.PULL_UP)

btn_val_last = 1

led_state = 'red'
r_led.duty(1023)
g_led.duty(0)

while True:
  #print('btn =', btn.value())
  # check that the button changed from high to low:
  if btn.value() == 0:  # button value is low
    if btn_val_last == 1:  # last button value was high
      # fade from red to green:
      if led_state == 'red':
        for i in range(1023):
          r_led.duty(1023-i)
          g_led.duty(i)
          sleep_ms(1)
        #b_led.on()
        led_state = 'green'
      # change from green to blue:
      elif led_state == 'green':
        r_led.off()
        g_led.off()
        b_led.on()
        led_state = 'blue'
      # change from blue to red:
      elif led_state == 'blue':
        r_led.on()
        g_led.off()
        b_led.off()
        led_state = 'red'
      print('led_state =', led_state)
  # update the last button value:
  btn_val_last = btn.value()
  sleep_ms(100)