For EGR101

dorm_sign.ino

/*
Dorm room sign code by:
Jimmy Xiao
Amanda Andriessen

Based on:

    Exploring Arduino - Code Listing 2-4: Simple LED Control with a Button
    http://www.exploringarduino.com/content/ch2

    Copyright 2013 Jeremy Blum ( http://www.jeremyblum.com )
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License v3 as published by
    the Free Software Foundation.

*/

// const int definitions to refer back to the pin numbers easily in later code.

const int LED_A=9;      //The LED A (for Amanda) is connected to pin 9
const int BUTTON_A=2;      //The Button A is connected to pin 2
const int LED_E = 10;      //The LED E (for Elena) is connected to pin 10
const int BUTTON_E= 3;      //The Button E is connected to pin 3
void setup()
{
  pinMode (LED_A, OUTPUT);     //Set the LED A pin as an output
  pinMode (BUTTON_A, INPUT);   //Set button A as input
  pinMode (LED_E, OUTPUT);     //Set the LED E pin as an output
  pinMode (BUTTON_E, INPUT);   //Set button E as input
}

void loop() // main loop 
{
  static bool light_state_A = true; //holds the state of the led. Static so it doesn't get deleted once this stack ends and loop gets called again
  if (digitalRead(BUTTON_A) == HIGH) //If Button is pressed
  {
    light_state_A = !light_state_A; //flip state
    if(light_state_A) // turn on/off LED pin according to state variable
      digitalWrite(LED_A, HIGH);
    else
      digitalWrite(LED_A,LOW);
    delay(100); // delay 100 ms because without this, the state will flip again if the user holds the button it down for more than one loop duration which is pretty much guaranteed unless they were super fast about pressing it
  }
  static bool light_state_E = true; //everything here is identical except LED and buttons for Elena instead of Amanda
  if (digitalRead(BUTTON_E) == HIGH)
  {
    light_state_E = !light_state_E;
    if(light_state_E)
      digitalWrite(LED_E, HIGH);
    else
      digitalWrite(LED_E,LOW);
    delay(100);
  }
}