RFID Reader

This RFID reader will read a keycode and print it to a 16×2 lcd and also print it through serial.  You will need:

• Parallax RFID reader (RFID Reader)

• Arduino with USB cable
• Arduino Sketch
• 16×2 LCD (optional)

1. Connect RFID reader from sout to pin 8 and enable to pin 7. Upload the following sketch and off you go.  If you wish not to use an LCD just comment out the lines using “//” that mention “lcd”.

// RFID reader for Arduino
#include <LiquidCrystal.h>
#include <SoftwareSerial.h>
LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);
int backLight = 13; // pin 13 will control the backlight
int val = 0;
int x = 0;
char code[10];
int bytesread = 0;
#define rxPin 8
#define txPin 1
SoftwareSerial RFID = SoftwareSerial(rxPin, txPin);
byte backSlash[8] = {
    0, 16, 8, 4, 2, 1, 0, 0
};
void setup()
{
    pinMode(backLight, OUTPUT);
    digitalWrite(backLight, HIGH);
    RFID.begin(2400); // RFID reader SOUT pin connected to Serial RX pin at 2400bps
    pinMode(7, OUTPUT); // Set digital pin 2 as OUTPUT to connect it to the RFID /ENABLE pin
    digitalWrite(7, LOW); // Activate the RFID reader
    lcd.begin(16, 2); // columns, rows.  use 16,2 for a 16x2 LCD, etc.
    lcd.clear();
}

void loop()
{
    lcd.createChar(3, backSlash);
    if (x == 0) {
        //lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Waiting For RFID");
        lcd.setCursor(0, 1);
        lcd.print("#.#.#. | .#.#.#.");
        delay(500);
        x++;
    }
    else if (x == 1) {
        //lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Waiting For RFID");
        lcd.setCursor(0, 1);
        lcd.print(".#.#.#   #.#.#.#");
        lcd.setCursor(7, 1);
        lcd.write(3);
        delay(500);
        x++;
    }
    else if (x == 2) {
        //lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Waiting For RFID");
        lcd.setCursor(0, 1);
        lcd.print("#.#.#. - .#.#.#.");
        delay(500);
        x++;
    }
    else if (x == 3) {
        //lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Waiting For RFID");
        lcd.setCursor(0, 1);
        lcd.print(".#.#.# / #.#.#.#");
        delay(500);
        x = 0;
    }
    if (RFID.available() > 0) { // if data available from reader
        if ((val = RFID.read()) == 10) { // check for header
            bytesread = 0;
            while (bytesread < 10) { // read 10 digit code
                if (RFID.available() > 0) {
                    val = RFID.read();
                    if ((val == 10) || (val == 13)) { // if header or stop bytes before the 10 digit reading
                        break; // stop reading
                    }
                    code[bytesread] = val; // add the digit
                    // lcd.setCursor(1,bytesread);
                    // lcd.print(val);
                    bytesread++; // ready to read next digit
                }
            }
            if (bytesread == 10) { // if 10 digit read is complete
                RFID.print("Keycode is: "); // possibly a good TAG
                RFID.println(code); // print the TAG code
                lcd.clear();
                lcd.setCursor(0, 0);
                lcd.print("RFID Code is....");
                lcd.setCursor(0, 1);
                lcd.print(code);
                lcd.setCursor(10, 1);
                lcd.print(" ");
                RFID.flush();
            }
            bytesread = 0;
            digitalWrite(7, HIGH); // deactivate the RFID reader for a moment so it will not flood
            delay(10000);
            lcd.clear();
            RFID.flush();
            digitalWrite(7, LOW); // Activate the RFID reader
        }
    }
}