#include <Servo.h> //showing that the servo motor is there and using the servo library 
Servo myservo; 
int servoPin = 3; //saying which pin the servo is connected to
int pir1 = 9; //stating that the 1st pir sensor is connected to pin 9
int pir2 = 10; //stating that the 2nd pir sensor is connected to pin 10
int pir3 = 12; //stating that the 3rd pir sensor is connected to pin 12
int pir4 = 11; //stating that the 4th pir sensor is connected to pin 11

void setup() {
  Serial.begin(9600); //shows that there is a connection between the Arduino and the device controlling it
  myservo.attach(3); //servo is attached to pin 3 on Arduino
  pinMode(9, INPUT); //the pir 1 is an input
  pinMode(10, INPUT); //the pir 2 is an input
  pinMode(11, INPUT); //the pir 4 is an input
  pinMode(12, INPUT); //the pir 3 is an input
}

void loop() {
  if (digitalRead (pir1) == HIGH && digitalRead(pir2) == LOW && digitalRead(pir3) == LOW && digitalRead(pir4) == LOW)
  myservo.write(45);//when the 1st pir sensor is on, and the other 3 are off, the servo is at 0 degrees

  if (digitalRead(pir1) == HIGH && digitalRead(pir2) == LOW)
  myservo.write(0);//allows the servo to do a sweep between 0 and 45 degrees


  if (digitalRead(pir2) == HIGH && digitalRead(pir3) == LOW && digitalRead(pir4) == LOW && digitalRead(pir1) == LOW)
  myservo.write(90); //when the 2nd pir sensor is on, and the other 3 are off, the servo is at 60 degrees

  if (digitalRead(pir2) == HIGH && digitalRead(pir3) == LOW)
  myservo.write(45);//allows the servo to do a sweep between 45 and 90 degrees


  if (digitalRead(pir3) == HIGH && digitalRead(pir4) == LOW && digitalRead(pir2) == LOW && digitalRead(pir1) == LOW)
  myservo.write(135); //when the 3rd pir sensor is on, and the other 3 are off, the servo is at 120 degrees
  
  if (digitalRead(pir3) == HIGH && digitalRead(pir4) == LOW)
  myservo.write(90);//allows the servo to do a sweep between 90 and 135 degrees


  if (digitalRead(pir4) == HIGH && digitalRead(pir3) == LOW && digitalRead(pir2) == LOW && digitalRead(pir1) == LOW)
  myservo.write(180); //when the 4th pir sensor is on, and the other 3 are off, the servo is at 180 degrees

if (digitalRead(pir4) == HIGH && digitalRead(pir3) == LOW)
  myservo.write(135);//allows the servo to do a sweep between 180 and 135 degrees
}