bool ledstate = false;
bool Lastbuttonstate = HIGH;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(3, OUTPUT);
  pinMode(4, INPUT);
  pinMode(5, OUTPUT);
  pinMode(6, INPUT);
  pinMode(7, OUTPUT);
  pinMode(8, INPUT);
  pinMode(9, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int x = digitalRead(4);
  Serial.println(x);
  if(x==1){
    digitalWrite(3, HIGH);
    delay(20);
  }
  else {
    digitalWrite(3, LOW);
    delay(20);
  }
  int y = digitalRead(6);
  if (y==1){
    digitalWrite(7, HIGH);
    delay(20);
    for(int i=0; i<3; i++){
      tone(5, 1000);
      delay(200);
      noTone(5);
      delay(200);
    }
  }
  else{
    digitalWrite(7, LOW);
    delay(20);
    noTone(5);
  }
  bool buttonstate = digitalRead(8);
  if (buttonstate == LOW && Lastbuttonstate == HIGH){
    ledstate = !ledstate ;
    digitalWrite(9, ledstate ? LOW : HIGH);
    delay(200);
  }
  Lastbuttonstate = buttonstate;
}