#define LEDPin  D10
#define buzzerPin D9
#define relayPin  D8
#define pirPin D7
#define servoPin D4

//Alarm and Motion Variables
unsigned long alarmCurrentMillis;
unsigned long servoCurrentMillis;
unsigned long servoStartMillis = 0;
unsigned long alarmStartMillis = 0;
bool alarmState = HIGH;
const byte alarmDelay = 150;
const byte StepPeriod = 50;
const byte StepIncrement = 2;

bool pirState = LOW;

Servo myServo; 


void setup() {
  Serial.begin(115200);
  pinMode(LEDPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(relayPin, OUTPUT);
  pinMode(pirPin, INPUT);
}

void loop() {
 servoCurrentMillis = millis();
 servoSweep();
 //alarm();
}

void alarm(){
  pirState = digitalRead(pirPin);
  if(pirState == HIGH){
    digitalWrite(relayPin, HIGH);
    alarmCurrentMillis = millis();
    if(alarmCurrentMillis - alarmStartMillis > alarmDelay){
      digitalWrite(LEDPin, alarmState);
      if(alarmState == HIGH){
        tone(buzzerPin, 300);
      } else {
        noTone(buzzerPin);
      }
      alarmState = !alarmState;
      alarmStartMillis = alarmCurrentMillis;
    }
  } else {
        digitalWrite(relayPin, LOW);
  }
}

void servoSweep(){

  static int pos = 0;
  static int increment = StepIncrement;

  if (servoCurrentMillis - servoStartMillis >= StepPeriod)
  {
    servoStartMillis = servoCurrentMillis;
    
    pos += increment;
    if (pos > 180)
    {
      pos = 180;
      increment = -StepIncrement;
    }
    
    if (pos < 0)
    {
      pos = 0;
      increment = StepIncrement;
    }
    
    myServo.write(pos);
  }
}