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/*
 *   ref_vs_pointers
 *   A sketch written to help people understand the use of references and pointers
 *   Written by Peter Dalmaris, April 8 2016.
 *   Arduino Tips and Tricks
 *   txplore.com
 *
 *   Requirements: MemoryFree from https://github.com/McNeight/MemoryFree
 */

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/*
 *   multitasking_demo
 *   A sketch written to help people understand how to implement basic multitasking on the Arduino
 *   Written by Peter Dalmaris, April 21 2016.
 *   Arduino Tips and Tricks
 *   txplore.com
 *
 *   Requirements: An Arduino, two LEDs, two 220Ohm resistors, a breadboard, wires.
 *   Play around with the variables in lines 18 to 26 to create different light show patterns. 
 */

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/*
 * 
 *  This sketch demonstrates the use of the
 *  Scheduler library.
 * 
 *  To use, you will need an Arduino Due or Zero,
 *  four LEDs, four 220Ohm resistors, jumper wires 
 *  and a breadboard.
 *  Connect the LEDs to a resistor, and the resistors
 *  to pins 11, 10, 9, 8 on the Due.

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void setup(){
  Serial.begin(9600);
}

void loop (){
  a_function();
//  Serial.print("In loop: ");
//  Serial.println(local_variable);  // local_variable is out of scope so compilation will produce an error message
  delay(1000);
}

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int local_variable = 0;

void setup(){
  Serial.begin(9600);
}

void loop (){
  a_function();
  Serial.print("In loop: ");
  Serial.println(local_variable);

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static int local_variable = 0;

void setup(){
  Serial.begin(9600);
}

void loop (){
  a_function();
  Serial.print("In loop: ");
  Serial.println(local_variable);

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void setup(){
  Serial.begin(9600);
}

void loop (){
  a_function();
//  Serial.print("In loop: ");
//  Serial.println(local_variable);  // local_variable is out of scope so compilation will produce an error message
  delay(1000);
}

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int a;                   //A variable which is also access by an interrupt service routine

void setup(){
}

void loop(){
     a = 1;
     int b;
     b = a + 1;
     Serial.println(b);

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volatile int a;                   //A variable which is also access by an interrupt service routine
void loop(){
     a = 1;
     int b;
     b = a + 1;
     Serial.println(b);
}

void isr0 ()  {
  detachInterrupt(0);

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// In this file I want to show how to create an array of a struct for the Arduino.
// I create a struct that contains ints for RGB color components.
// Then, I create an array of this struct, and use it to display a color 
// show on an Adafruit 40 RGB LED shield array.

// Check out my Arduino blog at txplore.com, and my video courses at txplore.tv!

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
  #include <avr/power.h>