Bag Tracking Using RFID + GSM (SIM800L)

/*

   All the resources for this project: https://www.hackster.io/Aritro
   Modified by Aritro Mukherjee


*/

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

//SIM800L TX is connected to Arduino D7
#define SIM800L_TX_PIN 7

//SIM800L RX is connected to Arduino D6
#define SIM800L_RX_PIN 6

//Create software serial object to communicate with SIM800L
SoftwareSerial serialSIM800L(SIM800L_TX_PIN, SIM800L_RX_PIN);



#define SS_PIN 10
#define RST_PIN 9



MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.

void setup()
{
  Serial.begin(9600);   // Initiate a serial communication
  SPI.begin();      // Initiate  SPI bus

  mfrc522.PCD_Init();   // Initiate MFRC522

  serialSIM800L.begin(9600);
  Serial.println("Setting up devices...");
  delay(10000);
  Serial.println("Setup Complete!");
  delay(3000);
  Serial.println("BAG Number");
  Serial.println();


}
void loop()
{
  // Look for new cards
  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) == "3C 7D 1E 2B") //change here the UID of the card/cards that you want to give access

  {
    Serial.println("Authorized access");
    Serial.println();
    delay(5000);
    sendSMSon1();
    delay(3000);

  }

  else if (content.substring(1) == "D6 17 FB 11")
  {
    Serial.println("Authorized access");
    Serial.println();
    delay(5000);
    sendSMSon2();
    delay(3000);

  }
  else   {
    Serial.println(" Access denied");
    delay(3000);
  }
}



void sendSMSon1() {

  Serial.println("Sending Text...");
  serialSIM800L.print("AT+CMGF=1\r"); // Set the shield to SMS mode
  delay(100);
  serialSIM800L.print("AT+CMGS=\"0541394732\"\r");
  delay(200);
  serialSIM800L.print("UID tag :  3C 7D 1E 2B ");
  serialSIM800L.print("Bag #01");
  serialSIM800L.print("\r"); //the content of the message
  delay(500);
  serialSIM800L.print((char)26);//the ASCII code of the ctrl+z is 26 (required according to the datasheet)
  delay(100);
  serialSIM800L.println();
  Serial.println("Text Sent.");
  delay(500);

}

void sendSMSon2() {

  Serial.println("Sending Text...");
  serialSIM800L.print("AT+CMGF=1\r"); // Set the shield to SMS mode
  delay(100);
  serialSIM800L.print("AT+CMGS=\"0541394732\"\r");
  delay(200);
  serialSIM800L.print("UID tag :  D6 17 FB 11 ");
  serialSIM800L.print("Bag #02");
  serialSIM800L.print("\r"); //the content of the message
  delay(500);
  serialSIM800L.print((char)26);//the ASCII code of the ctrl+z is 26 (required according to the datasheet)
  delay(100);
  serialSIM800L.println();
  Serial.println("Text Sent.");
  delay(500);

}