The file that is currently on an Arduino Uno with a serial number of 74132343530351609150

Ethernet_Pushbutton_Red_Amber_Green_LED.ino

/*
Red/green LED indicator with pushbutton control
Based on http://www.makeuseof.com/tag/arduino-traffic-light-controller/

USE_GITHUB_USERNAME=mark-wilson

*/

// Setup Ethernet Shield
#include <SPI.h>
#include <Ethernet.h>
boolean reading = false;

// Enter a MAC address and IP address for your controller below.
// The IP details will be dependent on your local network (commented out if DHCP in use):
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// byte ip[] = { 192, 168, 0, 112 }; //Manual setup only
// byte gateway[] = { 192, 168, 0, 1 }; //Manual setup only
// byte subnet[] = { 255, 255, 255, 0 }; //Manual setup only

// Initialize the Ethernet server library
// with the IP address and port you want to use 
// (port 80 is default for HTTP):
EthernetServer server(80);

// Pins for coloured LEDs
int red = 3;
int amber = 4;
int green = 5;
int light = 0;

int button = 2; // Pushbutton on pin 2
int buttonValue = 0; // Button defaults to 0 (LOW)

void setup(){
  Serial.begin(9600);
  
  // Set up pins with LEDs as output devices and switch for input
  // Pins 10,11,12 & 13 are used by the Ethernet Shield
  pinMode(red,OUTPUT);
  pinMode(amber,OUTPUT);
  pinMode(green,OUTPUT);
  pinMode(button,INPUT);
  
  // start the Ethernet connection and the server:
  Ethernet.begin(mac);
  //Ethernet.begin(mac, ip, gateway, subnet); //for manual setup

  server.begin();
  Serial.println(Ethernet.localIP());
}

void loop(){
  
  // listen for incoming clients, and process qequest.
  checkForClient();
  
  // Read the value of the pushbutton switch
  buttonValue = digitalRead(button);
  if (buttonValue == HIGH){
    changeLights();
    delay(1000); // Wait 1 second before reading again
  }
}
  
void changeLights(){
  // Change the lights based on current value: 0 is not set; 1 is red; 2 is amber; 3 is green
  switch (light) {
    case 1:
      turnLightAmber();
      break;
    case 2:
      turnLightGreen();
      break;
    case 3:
      turnLightRed();
    default:
      turnLightRed();
  }
}

void turnLightGreen(){
  // Turn off the red/amber and turn on the green
  digitalWrite(red,LOW);
  digitalWrite(amber,LOW);
  digitalWrite(green,HIGH);
  light = 3;
}

void turnLightAmber(){
  // Turn off the green/amber and turn on the red
  digitalWrite(green,LOW);
  digitalWrite(amber,HIGH);
  digitalWrite(red,LOW);
  light = 2;
}

void turnLightRed(){
  // Turn off the green/amber and turn on the red
  digitalWrite(green,LOW);
  digitalWrite(amber,LOW);
  digitalWrite(red,HIGH);
  light = 1;
}

void checkForClient(){

  EthernetClient client = server.available();

  if (client) {

    // An http request ends with a blank line
    boolean currentLineIsBlank = true;
    boolean sentHeader = false;

    while (client.connected()) {
      if (client.available()) {

        if(!sentHeader){
          // Send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          sentHeader = true;
        }

        char c = client.read();

        if(reading && c == ' ') reading = false;
        if(c == '?') reading = true; //found the ?, begin reading the info

        if(reading){
          Serial.print(c);

           switch (c) {
             case 'a':
               turnLightAmber();
               break;
             case 'g':
               turnLightGreen();
               break;
             case 'r':
               turnLightRed();
               break;
           }
        }

        if (c == '\n' && currentLineIsBlank)  break;

        if (c == '\n') {
          currentLineIsBlank = true;
        }else if (c != '\r') {
          currentLineIsBlank = false;
        }

      }
    }

    delay(1); // give the web browser time to receive the data
    client.stop(); // close the connection:

  } 

}

Pushbutton_Red_Amber_Green_LED.ino

/*
Red/green LED indicator with pushbutton control
Based on http://www.makeuseof.com/tag/arduino-traffic-light-controller/

USE_GITHUB_USERNAME=mark-wilson

*/

// Pins for coloured LEDs
int red = 10;
int amber = 11;
int green = 12;
int light = 0;

int button = 2; // Pushbutton on pin 2
int buttonValue = 0; // Button defaults to 0 (LOW)

void setup(){
  // Set up pins with LEDs as output devices and switch for input
  pinMode(red,OUTPUT);
  pinMode(amber,OUTPUT);
  pinMode(green,OUTPUT);
  pinMode(button,INPUT);
}

void loop(){
  // Read the value of the pushbutton switch
  buttonValue = digitalRead(button);
  if (buttonValue == HIGH){
    changeLights();
    delay(1000); // Wait 1 second before reading again
  }
}
  
void changeLights(){
  // Change the lights based on current value: 0 is not set; 1 is red; 2 is amber; 3 is green
  switch (light) {
    case 1:
      turnLightAmber();
      break;
    case 2:
      turnLightGreen();
      break;
    case 3:
      turnLightRed();
    default:
      turnLightRed();
  }
}

void turnLightGreen(){
  // Turn off the red/amber and turn on the green
  digitalWrite(red,LOW);
  digitalWrite(amber,LOW);
  digitalWrite(green,HIGH);
  light = 3;
}

void turnLightAmber(){
  // Turn off the green/amber and turn on the red
  digitalWrite(green,LOW);
  digitalWrite(amber,HIGH);
  digitalWrite(red,LOW);
  light = 2;
}

void turnLightRed(){
  // Turn off the green/amber and turn on the red
  digitalWrite(green,LOW);
  digitalWrite(amber,LOW);
  digitalWrite(red,HIGH);
  light = 1;
}