//#define BUZZER_PIN 4

#define SWTICH1 12
#define SWTICH2 11
#define SWTICH3 10
#define SWTICH4 9

void setup() {
  Serial.begin(9600);
  //pinMode(BUZZER_PIN, OUTPUT);
  pinMode(SWTICH1, INPUT_PULLUP);
  pinMode(SWTICH2, INPUT_PULLUP);
  pinMode(SWTICH3, INPUT_PULLUP);
  pinMode(SWTICH4, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(SWTICH1) == LOW) {
    delay(20);
    tone(4,264, 300);                //โทนเสียงที่1
    while (digitalRead(SWTICH1) == LOW) {
      delay(20);
    }
  }
  if (digitalRead(SWTICH2) == LOW) {
    delay(20);
    tone(4,364, 300);                //โทนเสียงที่2
    while (digitalRead(SWTICH2) == LOW) {
      delay(20);
    }
  }
  if (digitalRead(SWTICH3) == LOW) {
    delay(20);
    tone(4,464, 300);               //โทนเสียงที่3
    while (digitalRead(SWTICH3) == LOW) {
      delay(20);
    }
  }
  if (digitalRead(SWTICH4) == LOW) {
    delay(20);
    tone(4,564, 300);               //โทนเสียงที่3
    while (digitalRead(SWTICH4) == LOW) {
      delay(20);
    }
  }
  //noTone(BUZZER_PIN);
}