// declaration of pins
unsigned int bluePin = 3; 
//declaration of button
int button = 21; 
void setup() {
  // setup mode for pins
pinMode(bluePin, OUTPUT);
//setup mode for buttons
pinMode(button, INPUT_PULLUP);
digitalWrite(button, LOW);
//initialize PINS/OUTPUT with a value 
digitalWrite(bluePin, LOW);
//begin Serial for tracking
Serial.begin(9600);
}
void loop() {
int buttonOn = digitalRead(button); 
if (buttonOn == HIGH){
  digitalWrite (bluePin, HIGH); 
  Serial.println("Blue LED On.");
  delay (250); 
  }
int buttonOff = digitalRead(button);
if (buttonOff == LOW){
  digitalWrite (bluePin,LOW); 
  Serial.println("Blue LED Off.");
  delay (250); 
  }
}