#include <Servo.h>

const int MOTION_SENSOR_PIN = 7;
const int SERVO_PIN         = 9; 

Servo servo;


int angle = 0;         
int lastMotionState;   
int currentMotionState;

void setup() {
  Serial.begin(9600);                
  pinMode(MOTION_SENSOR_PIN, INPUT);
  servo.attach(SERVO_PIN);          

  servo.write(angle);
  currentMotionState = digitalRead(MOTION_SENSOR_PIN);
}

void loop() {
  lastMotionState    = currentMotionState;            
  currentMotionState = digitalRead(MOTION_SENSOR_PIN); 

  if (currentMotionState == LOW && lastMotionState == HIGH) { 
    Serial.println("Motion detected!");
    servo.write(90);
  }
  else
  if (currentMotionState == HIGH && lastMotionState == LOW) { 
    Serial.println("Motion stopped!");
    servo.write(0);
  }
} #Husin M