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http://www.seeedstudio.com/wiki/Grove_-_125KHz_RFID_Reader

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#include <SoftwareSerial.h>

SoftwareSerial SoftSerial(2, 3);
unsigned char buffer[64]; // buffer array for data recieve 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 (SoftSerial.available()) // if date is comming from softwareserial port ==> data is comming from SoftSerial shield
{
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 storaged data from the array
count = 0; // set counter of while loop to zero


}
if (Serial.available()) // if data is available on hardwareserial port ==> data is comming from PC or notebook
SoftSerial.write(Serial.read()); // write it to the SoftSerial shield
}
void clearBufferArray() // function to clear buffer array
{
for (int i=0; i { buffer[i]=NULL;} // clear all index of array with command NULL
}