#include <Servo.h>
Servo myservo;
int pos=0;
int ledPin=12;
int inputPin=2;
int pirState=LOW;
int val=0;
int buzzer = 10;
void setup() {
  pinMode(ledPin, OUTPUT);      
  pinMode(inputPin, INPUT);   
  myservo.attach(9);  
 pinMode(buzzer, OUTPUT);
  Serial.begin(9600);

}

void loop() {
  if (Serial.available() > 0) {
    String command = Serial.readStringUntil('\n');
    if (command == "activate") {
      activateDevices();
    }
  }

  val = digitalRead(inputPin); 
  if (val == HIGH) {            
    digitalWrite(ledPin, HIGH);  
    tone(buzzer, 1000);
    if (pirState == LOW) {
      
      pirState = HIGH;//
      Serial.println("检测到运动!");
      activateDevices();
    }
  } 
  else {
    digitalWrite(ledPin, LOW);
    if (pirState == HIGH){
      
      pirState = LOW;
      Serial.println("运动结束!");
    }
  }
  
  delay(1000);        
  noTone(buzzer);     
  delay(1000); 
}

void activateDevices() {
// 舵机从0度旋转到180度
      for (pos = 0; pos <= 180; pos += 1) { 
      myservo.write(pos);     // 设置舵机到当前位置         
      delay(15); // 等待15毫秒                      
      }
      // 舵机从180度旋转回0度
      for (pos = 180; pos >= 0; pos -= 1) {
      myservo.write(pos);              
      delay(15);                       
      }
}