#define LED 20
#define BUTTON 8

//variable to keep track of how manny button presses
int buttonPresses = 0;

void setup() {
  Serial.begin(115200);
  delay(10);
  pinMode(LED, OUTPUT);
  pinMode(BUTTON, INPUT_PULLUP);
}

//loop function
void loop() {

  //if button is pressed
  if (digitalRead(BUTTON) == HIGH) {
    
    //increment buttonPresses
    buttonPresses++;

    //if buttonPresses is greater than 4
    if (buttonPresses > 4) {
      //reset buttonPresses to 0
      buttonPresses = 0;
    }

    //if buttonPresses is 1
    if (buttonPresses == 1) {
      //blink LED once
      digitalWrite(LED, HIGH);
      delay(200);
      digitalWrite(LED, LOW);
    }

    //if buttonPresses is 2
    if (buttonPresses == 2) {
      //blink LED twice
      for (int i = 0; i < 2; i++) {
        digitalWrite(LED, HIGH);
        delay(200);
        digitalWrite(LED, LOW);
        delay(200);
      }
    }

    //if buttonPresses is 3
    if (buttonPresses == 3) {
      //blink LED three times
      for (int i = 0; i < 3; i++) {
        digitalWrite(LED, HIGH);
        delay(200);
        digitalWrite(LED, LOW);
        delay(200);
      }
    }

    //if buttonPresses is 4
    if (buttonPresses == 4) {
      //blink LED four times
      for (int i = 0; i < 4; i++) {
        digitalWrite(LED, HIGH);
        delay(200);
        digitalWrite(LED, LOW);
        delay(200);
      }
      //set buttonPresses variable back to 0
      buttonPresses = 0;
    }

    //wait for button to be released
    while (digitalRead(BUTTON) == HIGH) {
    }
  }
}