#include <Servo.h>

#define pirPin1 7
#define pirPin2 6
#define pirPin3 5
#define pirPin4 4
#define servoPin 9

Servo myservo;

void setup() {
  Serial.begin(9600);
  myservo.attach(servoPin);
  myservo.write(90);
  pinMode(pirPin1, INPUT);
  pinMode(pirPin2, INPUT);
  pinMode(pirPin3, INPUT);
  pinMode(pirPin4, INPUT);
}

void loop() {
  int pir1 = digitalRead(pirPin1);
  int pir2 = digitalRead(pirPin2);
  int pir3 = digitalRead(pirPin3);
  int pir4 = digitalRead(pirPin4);

  if (pir1) {
    myservo.write(0);
    delay(100);
    myservo.write(90);
  }
  if (pir2) {
    myservo.write(45);
    delay(100);
    myservo.write(90);
  }
  if (pir3) {
    myservo.write(135);
    delay(100);
    myservo.write(90);
  }
  if (pir4) {
    myservo.write(180);
    delay(100);
    myservo.write(90);
  }
}