#define buzzerpin 12
#define PIR_pin 12

void setup() {
  Serial.begin(115200);
  pinMode(buzzerpin, OUTPUT);
  pinMode(PIR_pin, INPUT);
}

void loop() {
  int value =digitalRead(PIR_pin);
  if(value = HIGH){
   Serial.print("有人");
  }else{
   Serial.print("沒人");
  }
  delay(100);
}