const int switchPin = 2;
const int ledPin = 13;
int buttonState;
int lightState = 0;
int blinkState = LOW;
long previousMillis = 0;
long interval = 1000;
unsigned long currentMillis = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(switchPin, INPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
  buttonState = digitalRead(switchPin);
}

void loop() {
  // put your main code here, to run repeatedly:
 int val = digitalRead(switchPin);
  delay (10);
  int val2 = digitalRead(switchPin);
  if (val == val2){
    if (val != buttonState) {
      if (val == LOW) {               // Remove this IF statement to engage LED when button is pressed
        if (lightState == 0) {
          lightState = 1;
          digitalWrite(ledPin, HIGH);
          Serial.println(("Button pressed, light ON"));
          currentMillis = 0;
          previousMillis = 0;
          blinkState = LOW;
        }
        else{
          lightState = 0;
          digitalWrite(ledPin, LOW);
          blinkState = LOW;
          Serial.println(("Button pressed, light OFF"));
        }
      }
    }
  }

  if (lightState== 1){
    currentMillis = millis();
    if(currentMillis - previousMillis > interval ){
      previousMillis = currentMillis;
      if (blinkState == LOW)
        blinkState = HIGH;
      else
        blinkState = LOW;
      digitalWrite(ledPin, blinkState);
    }
  }

  buttonState = val;
}