//#include <SoftwareSerial.h>
#define PIR_PIN_1 3  //signal PIN from PIR sensor
#define LIGHT_1 50   // PIN for activating relay
//#define rxPin 12     //pin na kojem Arduino PRIMA data od bluetooth modula
//#define txPin 11     //pin na koji Arduino ŠALJE data na bluetooth modul

int delay_time = 0;  //default delay time for light bulb
int movement_1 = 0; //0 for movement not detected, 1 for movement detected
byte PIR_sensor_status = 0;  //0 for PIR sensor not avtivated, 1 for activated


//SoftwareSerial bluetooth_serial = SoftwareSerial(rxPin, txPin);


void setup() {
  // put your setup code here, to run once:
  pinMode(LIGHT_1, OUTPUT);          //on this PIN sending signal from Arduino to relay
  //pinMode(rxPin, INPUT);             
  //pinMode(txPin, OUTPUT);            
  pinMode(PIR_PIN_1, INPUT_PULLUP);  //on this PIN receiving signal from PIR sensor

  attachInterrupt(digitalPinToInterrupt(PIR_PIN_1), pir_interrupt, CHANGE); 
  /*interrupt programm when receiving signal from PIR sensor on CHANGE PIN status*/

  Serial.begin(9600);

  //bluetooth_serial.begin(9600);
  delay(1500);
  /*
  while (!bluetooth_serial) {
    Serial.println("Bluetooth not connected");
  }
  */
  digitalWrite(LIGHT_1, LOW);  //disable light on the beginning of the programm
  PIR_sensor_status = 1; //turn on PIR sensor
}

void loop() {
  // put your main code here, to run repeatedly:

  read_from_keyboard();

  delay(20);
}


void PIR_sensor() {
  noInterrupts();
  
  movement_1 = digitalRead(PIR_PIN_1);
  Serial.print("Movemment: ");
  Serial.print(movement_1);
  Serial.println();
  Serial.print("PIR sensor status: ");
  Serial.print(PIR_sensor_status);
  Serial.println();
  if (movement_1 == 1 && PIR_sensor_status == 1) {
    digitalWrite(LIGHT_1, HIGH);  //if PIR sensor activated turn ON the Relay
    delay(delay_time);
    
    
  
    //digitalWrite(LIGHT_1, HIGH);
  }
  else if (movement_1 == 1 && PIR_sensor_status == 0){
    digitalWrite(LIGHT_1, LOW);
    delay(delay_time);
  }
  else if (movement_1 == 0 && PIR_sensor_status == 1){
    digitalWrite(LIGHT_1, LOW);
    delay(delay_time);
  }
  else if (movement_1 == 0 && PIR_sensor_status == 0){
    digitalWrite(LIGHT_1, LOW);
    delay(delay_time);
  }
  
  interrupts();
}

void pir_interrupt() {
  
    PIR_sensor();
  
}

void read_from_keyboard() {

  if (Serial.available() > 0){
  
  
    int stroke = Serial.read(); //read from keyboard input
    
    switch (stroke) {

      case 49: //keyboard button "1"
        Serial.println("Light on");
        digitalWrite(LIGHT_1, HIGH);
        break;
      case 48: //keyboard button "0"
        Serial.println("Light off");
        digitalWrite(LIGHT_1, LOW);
        break;
      case 50: //keyboard button "2"
        Serial.println("PIR Sensor on");
        PIR_sensor_status = 1;
        break;
      case 51: //keyboard button "3"
        Serial.println("PIR Sensor off");
        PIR_sensor_status = 0;
        break;
      default:

        break;
          }
  }
  
}