WTH 수행평가

ㅁㄴㅇㄹ. ino

#define BUTTON1 3#define BUTTON2 4#define BUTTON3 5
#define LED1 9#define LED2 10#define LED3 11
#define BUZZER 2
bool buttonFlag = false;
void setup(){
  Serial.begin(9600);    pinMode(LED1, OUTPUT);  pinMode(LED2, OUTPUT);  pinMode(LED3, OUTPUT);    pinMode(BUTTON1, INPUT_PULLUP);  pinMode(BUTTON2, INPUT_PULLUP);  pinMode(BUTTON3, INPUT_PULLUP);    pinMode(BUZZER, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(BUTTON1), onButtonChanged, FALLING);  attachInterrupt(digitalPinToInterrupt(BUTTON2), onButtonChanged, FALLING);  attachInterrupt(digitalPinToInterrupt(BUTTON3), onButtonChanged, FALLING);}
void onButtonChanged(){  if(buttonFlag) return;
  bool isClickedFirst = !digitalRead(BUTTON1);  bool isClickedSecond = !digitalRead(BUTTON2);  bool isClickedThird = !digitalRead(BUTTON3);
  if(isClickedFirst){    Serial.println("clicked 1");    digitalWrite(LED1, HIGH);    tone(BUZZER, 200, 1000);  }   if (isClickedSecond){    Serial.println("clicked 2");    digitalWrite(LED2, HIGH);    tone(BUZZER, 300, 1000);  }   if (isClickedThird){    Serial.println("clicked3");    digitalWrite(LED3, HIGH);    tone(BUZZER, 400, 1000);  }  buttonFlag = true;}
void loop(){  if(buttonFlag){    delay(4000);    digitalWrite(LED1, LOW);    digitalWrite(LED2,LOW);    digitalWrite(LED3, LOW);    noTone(BUZZER);    buttonFlag = false;  }}