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Author Topic: Getting notification when an RFID is removed from a reader  (Read 37 times)
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I'm doing a project using the sparkfun RFID shield https://www.sparkfun.com/products/10406 and RFID module https://www.sparkfun.com/products/10126.

In the project, when a RIFD tag is placed on the reader and sends out a serial.println - this is pretty standard and already works in the sample code. What I want to do however is have it send a new Serial message when the tag is removed. I'm not to sure about how to go about doing this and any help would be really appreciated.

I've added the sparkfun sample code that I'm currently using below:

Code:
#include <SoftwareSerial.h>

int incomingByte = 0;

SoftwareSerial rfid(7, 8);
SoftwareSerial xbee(10, 9);

//Prototypes
void check_for_notag(void);
void halt(void);
void parse(void);
void print_serial(void);
void read_serial(void);
void seek(void);
void set_flag(void);

//Global var
int flag = 0;
int Str1[11];

//INIT
void setup()
{
  Serial.begin(9600);
  Serial.println("Start");

  // set the data rate for the SoftwareSerial ports
  xbee.begin(9600);
  rfid.begin(19200);
  delay(10);
  halt();
}

//MAIN
void loop()
{
  read_serial();
}

void check_for_notag()
{
 
  seek();
  delay(10);
  parse();
  set_flag();

  if(flag = 1){
    seek();
    delay(10);
    parse();
  }

}

void halt()
{
 //Halt tag
  rfid.write((uint8_t)255);
  rfid.write((uint8_t)0);
  rfid.write((uint8_t)1);
  rfid.write((uint8_t)147);
  rfid.write((uint8_t)148);
}

void parse()
{
  while(rfid.available()){
    if(rfid.read() == 255){
      for(int i=1;i<11;i++){
        Str1[i]= rfid.read();
      }
    }
  }
}

void print_serial()
{
  if(flag == 1){
    //print to serial port
    Serial.print(Str1[8], HEX);
    Serial.print(Str1[7], HEX);
    Serial.print(Str1[6], HEX);
    Serial.print(Str1[5], HEX);
    Serial.println();
   
    check_for_notag();
  }

 
}

void read_serial()
{
  seek();
  delay(10);
  parse();
  set_flag();
  print_serial();
  delay(100);
}

void seek()
{
  //search for RFID tag
  rfid.write((uint8_t)255);
  rfid.write((uint8_t)0);
  rfid.write((uint8_t)1);
  rfid.write((uint8_t)130);
  rfid.write((uint8_t)131);
  delay(10);
}

void set_flag()
{
  if(Str1[2] == 6){
    flag++;
  }
  if(Str1[2] == 2){
    flag = 0;
  }
}
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Check to see if pin 16 "OUTPUT OK" (Arduino Pin 12) stays high as long as the card is present.
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