#include <Servo.h>

int pos = 0;
int btn = 13;
Servo servo;

void setup() {
  // put your setup code here, to run once:
  pinMode(btn, INPUT_PULLUP);
  servo.attach(11);
  Serial.begin(115200);
}

void loop() {
  if(digitalRead(btn) == HIGH){
    pos++;
    while(digitalRead(btn) == HIGH){
      delay(50);
    }
  }
  Serial.println(pos);

  if(pos > 2){
    pos = 0;
  }

  if(pos == 1){
    for (int i = 0; i <= 5; i++) {
      servo.write(180);
      digitalWrite(12, HIGH);
      delay(500);
      servo.write(0);
      digitalWrite(12, LOW);
      delay(500);
    }
  } else if (pos == 2){
    digitalWrite(12, LOW);
    servo.write(45);
    delay(500);
  } else {
    for (int i = 0; i < 3; i++) {
      servo.write(90);
      digitalWrite(12, HIGH);
      delay(250);
      servo.write(90);
      digitalWrite(12, LOW);
      delay(250);
    }
  }
}