#include <Servo.h>  


int ser_pin = 9;    
int pos = 0;        
int pirPin = 12;    


Servo myServo;      

void setup() {
    pinMode(pirPin, INPUT);     
    myServo.attach(ser_pin);    
    myServo.write(pos);        
    Serial.begin(9600);         
}

void loop() {
    int motion = digitalRead(pirPin);  

    if (motion == HIGH) {
        Serial.println("Motion detected!"); 

        // Move the servo from 0 to 180 degrees
        for (pos = 0; pos <= 180; pos += 1) {  
            myServo.write(pos);               
            delay(15);                         
        }

        delay(1000);  

      
        for (pos = 180; pos >= 0; pos -= 1) { 
            myServo.write(pos);               
            delay(15);                         
        }
        
        delay(1000);  
    } else {
        Serial.println("No motion detected.");  
    }

    delay(500);  
}