/* 
//MIRRU IN MIRRU OUT
//CODE TO CONTROL OPENING SYSTEM
RFID+SERVO MOTOR+BLUETOOTH
//latest version
//17 June 2019
Pamela Martello
*/

//For Bluetooth communication//
#include <SoftwareSerial.h>
SoftwareSerial BT(6,7); //TXD,RXD pin for Bluetooth module 

#include <SPI.h> //peripheral communication
#include <MFRC522.h> ///RFID library
#include <Servo.h> // Servo library
#define SS_PIN 10 // RFID PINS
#define RST_PIN 9 //RFID PINS
#define ACCESS_DELAY 10000 //delay open the lock 10,000millis=10secs
#define DENIED_DELAY 1000

//For Bluetooth communication//
int state; //the current state
int i;
int flag=0;  //makes sure that the serial only prints once the state

MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance
Servo myservo;  // create servo object to control a servo


void setup() {
  Serial.begin(9600);   // Initiate a serial communication
  BT.begin(115200); //enable bluetooth communication
  delay(3000);
  SPI.begin();          // Initiate  SPI bus
  mfrc522.PCD_Init();   // Initiate MFRC522
  Serial.println("Put your card to the reader...");
  Serial.println();
  myservo.attach(3);  // attaches the servo on pin 3 to the servo object
  myservo.write(100);
  mfrc522.PCD_SetAntennaGain(mfrc522.RxGain_max); //If you set Antenna Gain to Max it will increase reading distance it increases about 1-2cm
}

void loop() {
  if (BT.available())//condition to find and read BT device //if the bluetooth is available functions
{
 state= BT.read(); //initialize reading
 flag=0;
}
if(state=='O'){ //this is the message that will be sent to the bluetooth that will enable the opening
  myservo.write(0);
  }
else if(state=='C'){ //this is the message that will be sent to the bluetooth that will enable the closing
  myservo.write(90);
  }
delay(200);//delay between pressing open/close button

 // Look for new cards-this is the loop for the RFID tag reader
  if ( ! mfrc522.PICC_IsNewCardPresent()) 
  {
    return;
  }
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial()) 
  {
    return;
  }
  //Show UID on serial monitor
  Serial.print("UID tag :");
  String content= "";
  byte letter;
  for (byte i = 0; i < mfrc522.uid.size; i++) 
  {
     Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
     Serial.print(mfrc522.uid.uidByte[i], HEX);
     content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
     content.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  Serial.println();
  Serial.print("Message : ");
  content.toUpperCase();
  if (content.substring(1) == "09 5E BB 59") // MIRRU NECKLACE 09 5E BB 59 change here the UID of the card/cards that you want to give access (to know the code  of your tag use MFRC522 examples inside MFRC522>DumpInfo)
 {
    Serial.println("Authorize mirru access");
    Serial.println();
    delay(20);
    myservo.write(0);// lock position
    delay(ACCESS_DELAY); //delay to keep the lock open and let the cat go in
    myservo.write(90); // unlock position 
    delay(ACCESS_DELAY);
  }
 else   {
    Serial.println(" CATccess denied");
    
// delay(DENIED_DELAY);
  }

}