RFID Garage Door Opener

When my roommates and I moved into a new house we were renting we were only given one garage door opener between the four of us. The simple solution is to go buy 3 more garage door openers, I though it would be more interesting to create a RFID tag controlled garage door opener. This way all of us could simply have a RFID tag on our keychain or RFID sticker on our phones.

Materials Used

• Arduino Nano

• RFID RC522

• 2 x 9V battery

• 1 x RGB LED

• Small Project box

Schematic

Code

#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN 53
#define RST_PIN 5
MFRC522 mfrc522(SS_PIN, RST_PIN);

const int GreenLED = 9;
const int RedLED = 8;
const int ActivationPin = 2;


const int numberOfWhiteListedIDs = 5;

const String WhiteListedUID[numberOfWhiteListedIDs] = {"99 4C BD 5A","30 1A 0B 19","DE 00 0D 9B","CE E3 D9 AA","2E F7 0C 9B"};

String testUID = "99 4c BD 5A";

/** Function Defs */
void doorActivation();
bool UIDCheck(String tempUID);
String Byte2String();

/** Main */

void setup() {

Serial.begin(9600);
SPI.begin();
mfrc522.PCD_Init();

pinMode(ActivationPin, OUTPUT);
pinMode(GreenLED, OUTPUT);
pinMode(RedLED, OUTPUT); 
digitalWrite(ActivationPin, HIGH);
}

void loop() {

  String currentTAG;
  bool access = 0;


  if ( ! mfrc522.PICC_IsNewCardPresent())
  {
      return;
  }
// Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial())
  {
      return;
  }
  currentTAG = Byte2String();

  access = UIDCheck(currentTAG);

  if (access == 1) {
      doorActivation();
  }
}

void doorActivation()
{
  digitalWrite(GreenLED, HIGH);
  Serial.print("Status LED: activated \n");
  digitalWrite(ActivationPin, LOW);
  Serial.print("Actvation Pin: activated \n");
  delay(100);
  Serial.print("Actvation Pin: deactivated \n");
  digitalWrite(ActivationPin, HIGH);

  delay(2000);
  Serial.print("Status LED: deactivated \n");
  digitalWrite(GreenLED, LOW);
};

bool UIDCheck(String tempUID){
  Serial.print(" UID being test:");
  Serial.print(tempUID);
  Serial.println("-");

  for (int i = 0; i < numberOfWhiteListedIDs; i++) {
    Serial.print("Testing against: ");
      Serial.print(WhiteListedUID[i]);
      Serial.println("-");
    if (tempUID.substring(1) == WhiteListedUID[i]) {

      Serial.print(" ACESS GRANTED FOR UID: ");
      Serial.println(tempUID);
      return 1;
    }
  }
  Serial.print("ACESS DENIED FOR UID: ");
  Serial.println(tempUID);
  digitalWrite(RedLED, HIGH);
  delay(2000);
  digitalWrite(RedLED, LOW);
  return 0;
};

String Byte2String(){
  String UniversalID = "";
  byte letter;
  for (byte i = 0; i < mfrc522.uid.size; i++)
  {
  UniversalID.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
  UniversalID.concat(String(mfrc522.uid.uidByte[i], HEX));
  }

  UniversalID.toUpperCase();
  return UniversalID;
}