int LEDred=12;
int buzz1=8;
int PIRsensor=7;
boolean start=false;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(LEDred, OUTPUT);
pinMode(buzz1, OUTPUT);
pinMode(PIRsensor, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
if (digitalRead(PIRsensor)==HIGH) {
  digitalWrite(LEDred, HIGH);
  tone(buzz1, 500);
  Serial.println("MOTION DETECTED");
}
else {
  digitalWrite(LEDred, LOW);
  noTone(buzz1);
  Serial.println("MOTION NOT DETECTED");
}
}