//Turn on LED and Relay using Arduino controlled by a button

//define the pin constants
int ledPin = 22;
int button = 23;
int relay = 24;

//define button state booleans
boolean changed;
boolean oldState;

void setup(){
  
  //set the led pin to output
  pinMode(ledPin, OUTPUT);
  
  //set the button to input
  pinMode(button, INPUT);
  
  //set the relay to output
  pinMode(relay, OUTPUT);
  
  //Initilize serial communication
  Serial.begin(57600);
  
  //assume in the beginning that the button has changed
  changed = true;
  
  //remember the old button state
  oldState = false;
}

void loop(){
  
  //read and store the button state
  boolean State =  digitalRead(button);
  
  //check if the button state has changed
  if(State != oldState){
    changed = true;
    oldState = State;
  }
  
  
  //If there is a change, send the status over Serial
  if(changed){
    Serial.print("The button status is: ");
    Serial.println(State);
    changed = false;
  }
  
  //set the led to the button state
  digitalWrite(ledPin,State);
  
  //set the relay to the button state
  digitalWrite(relay,State);
  
}