#include <Servo.h> 
Servo myServo; 
int pirPin1 = 13;     
int pirPin2 = 11; 
int pirPin3 = 9; 
int pirPin4 = 7; 
int servoPin = 3; 
int servoPos = 90; 
void setup() { 
  pinMode(pirPin1, INPUT); 
  pinMode(pirPin2, INPUT); 
  pinMode(pirPin3, INPUT); 
  pinMode(pirPin4, INPUT); 
  myServo.attach(servoPin); 
  Serial.begin(9600); 
} 
void loop() { 
  int pir1 = digitalRead(pirPin1); 
  int pir2 = digitalRead(pirPin2); 
  int pir3 = digitalRead(pirPin3); 
  int pir4 = digitalRead(pirPin4); 
  if (pir1 == HIGH || pir2 == HIGH || pir3 == HIGH || pir4 == HIGH) { 
    int servoPos = map(pir1 + 2*pir2 + 4*pir3 + 8*pir4, 0, 15, 0, 180); 
    myServo.write(servoPos); 
    delay(1000); 
  } 
  else { 
    myServo.write(servoPos); 
  } 
}