Networking and Communications

Code

MFRC522 library which simplifies reading from and writing to RFID tags
https://github.com/miguelbalboa/rfid




#include <SPI.h >
#include <MFRC522.h>
#define SS_PIN 0
#define RST_PIN 1
#define KEY_RETURN 0xB0 //The hex value for the return key is 0xB0.

MFRC522 mfrc522 ( SS_PIN, RST_PIN ) ;
char Enter = KEY_RETURN; //Return key is declared as Enter.
String readid;
String card1 = "a6c15673"; //Change this value to the UID of your card.

void setup( )
{
Serial.begin(115200);
SPI.begin();
mfrc522.PCD_Init();
pinMode(7, OUTPUT);
pinMode(6, OUTPUT);
}

void temp(byte *buffer, byte bufferSize)//function to store card uid as a string datatype.
{
readid = "";
for (byte i = 0; i < bufferSize; i++)
{
readid = readid + String(buffer[i], HEX);
}
}
void loop( )
{
if (!mfrc522.PICC_IsNewCardPresent())
{
return;
}
if (!mfrc522.PICC_ReadCardSerial())
{
return;
}
// mfrc522.PICC_DumpToSerial(&(mfrc522.uid)); // Display card details in serial Monitor.
temp(mfrc522.uid.uidByte, mfrc522.uid.size);
if (readid == card1)
{
Serial.println("haii abel");
digitalWrite(6, HIGH); // turn the LED on (HIGH is the voltage level)
delay(2000); // wait for a second
digitalWrite(6, LOW); // turn the LED off by making the voltage LOW
delay(2000); // wait for a

}
else
{ Serial.println("who the f*ck are you");
digitalWrite(7, HIGH); // turn the LED on (HIGH is the voltage level)
delay(2000); // wait for a second
digitalWrite(7, LOW); // turn the LED off by making the voltage LOW
delay(2000);

}
}