SeeedStudio Grove-125KHz RFID Reader, Manual, Page: 4 / 6

SoftSerial Shield is connected to the Software UART:D2&D3
*/
# include <SoftwareSerial.h>
SoftwareSerial
SoftSerial ( 2 , 3 );
unsigned char buffer[ 64 ]; // buffer array for data receive over serial port
int count = 0 ; // counter for buffer array
void setup ()
{
SoftSerial.begin(
9600 ); // the SoftSerial baud rate
Serial.begin( 9600 ); // the Serial port of Arduino baud rate.
}
void loop ()
{
// if date is coming from software serial port ==> data is coming from SoftSerial shield
if (SoftSerial.available())
{
while (SoftSerial.available()) // reading data into char array
{
buffer[count++] = SoftSerial.read();
// writing data into array
if (count == 64 ) break ;
}
Serial.write(buffer, count);
// if no data transmission ends, write buffer to hardware serial port
clearBufferArray(); // call clearBufferArray function to clear the stored data from the array
count = 0 ; // set counter of while loop to zero
}
if (Serial.available()) // if data is available on hardware serial port ==> data is coming from PC
or notebook
SoftSerial.write(Serial.read()); // write it to the SoftSerial shield
}
void clearBufferArray () // function to clear buffer array
{
// clear all index of array with command NULL
for ( int i= 0 ; i<count; i++)
{
buffer[i]=
NULL ;
}
}

Step 2. Open the Serial Monitor, the card information can be displayed as
shown below: