"""#---------------------------------------------------------
 A little program to demostrate to my nephew that there are 
 three primary colours that when mixed in various quatities 
 produces millions of secondary colours. 
 =========================

 In this program an RGB LED is connected to Pico.The three
 colours of the LED are flashed randomly every 500ms

 Author: Henderson Hood
 File : RGB.py
 Date : July, 2023
----------------------------------------------------------
"""
from machine import Pin
import utime
import random

# GPIO pins used by the RGB LED
Red = Pin(3, machine.Pin.OUT)
Green = Pin(4, Pin.OUT)
Blue = Pin(5, Pin.OUT)

while True:
  """
  Here we mix varying quatities of the 3 primary colours to
  produce numerous colours. Each mixture produces a different colour.
  0 means zero add, 1 means max added.
  """
  r = random.randint(0, 1)  #amount of Red to add
  g = random.randint(0, 1)  #amount of Green to add  
  b = random.randint(0, 1)  #amount of Blue to add
  
  #we store various degress of the primary color in LED; this happens
  #so fast that our eyes interpret the mixtures as different colours. 
  Red.value(r)
  utime.sleep(0.2)  
  Green.value(g)
  utime.sleep(0.2)
  Blue.value(b)
  utime.sleep(0.2)