Documentation: RFID 125kHz Module for Arduino Tutorial
Contents:
Introduction
Ingredients:
- 1 x RFID module for Arduino
- 1 x XBee shield
- 1 x RFID Antenna
- 2 x Read only cards (EM4100)
- 2 x Programmable cards (Read-Write Cards, T5557)
- 1 x Arduino Uno
- 1 x USB cable
- 1 x PC
Difficulty: Easy -
Preparation Time: 30 minutes
Steps Index
Steps Index:
- Connecting the RFID module to Arduino.
- Reading EM4100 cards (read only cards).
- Reading T5557 cards.
- Reading / writing T5557 cards.
- Reading / writing T5557 cards with password.
- Using the sleep mode.
- Video-Tutorial.
- Fritzing libraries.
Step 1: Connecting the RFID module to Arduino:
Setting up the hardware is very easy, just plug the XBee shield with the RFID module to Arduino. The jumpers in the XBee shield have to be set to XBEE position. Now you can program the Arduino and communicate it with the RFID module using the serial port (Serial.read(), Serial.print()...).
Step 2: Reading EM4100 cards (read only cards):
In this part we show an example of the Arduino reading EM4100 cards. We use the Auto Read mode. Arduino is waiting all the time, when a card is detected, we read its code, blink the Arduino LED and print the code over USB port.
| Command |
| 0x87 - Set Auto Mode: EM4102 Mode - Parity decoded - Manchester RF/64 |
| FF 01 09 87 01 03 02 00 10 20 30 40 37 |
Arduino code:
/*
* RFID module from Libelium for Arduino
* Basic program, just Read EM1000 cards
*
* Copyright (C) 2008 Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Version 0.1
* Author: Marcos Yarza
*/
// var
int led = 13;
byte data_1 = 0x00;
byte data_2 = 0x00;
byte data_3 = 0x00;
byte data_4 = 0x00;
byte data_5 = 0x00;
int val = 0;
void setup(){
// Start serial port 19200 bps
Serial.begin(19200);
pinMode(led, OUTPUT);
delay(500);
// Setting Auto Read Mode - EM4102 Decoded Mode - No password
// command: FF 01 09 87 01 03 02 00 10 20 30 40 37
Serial.print(0xFF,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x09,BYTE);
Serial.print(0x87,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x03,BYTE);
Serial.print(0x02,BYTE);
Serial.print(0x00,BYTE);
Serial.print(0x10,BYTE);
Serial.print(0x20,BYTE);
Serial.print(0x30,BYTE);
Serial.print(0x40,BYTE);
Serial.print(0x37,BYTE);
delay(500);
Serial.flush();
Serial.println();
Serial.println("RFID module started in Auto Read Mode");
}
void loop(){
val = Serial.read();
while (val != 0xff){
Serial.println("Waiting card");
val = Serial.read();
delay(1000);
}
// Serial.read(); // we read ff
Serial.read(); // we read 01
Serial.read(); // we read 06
Serial.read(); // we read 10
data_1 = Serial.read(); // we read data 1
data_2 = Serial.read(); // we read data 2
data_3 = Serial.read(); // we read data 3
data_4 = Serial.read(); // we read data 4
data_5 = Serial.read(); // we read data 5
Serial.read(); // we read checksum
// Led blink
for(int i = 0;i<4;i++){
digitalWrite(led,HIGH);
delay(500);
digitalWrite(led,LOW);
delay(500);
}
// Printing the code of the card
Serial.println();
Serial.print("EM4100 card found - Code: ");
writeByte(data_1);
writeByte(data_2);
writeByte(data_3);
writeByte(data_4);
writeByte(data_5);
Serial.println();
Serial.println();
}
//Write a byte (hex) in ASCII
void writeByte(byte data){
int aux_1 = 0;
int aux_2 = 0;
aux_1=data/16;
aux_2=data%16;
if (aux_1<10){
Serial.print(aux_1 + 48,BYTE);
}
else{
Serial.print(aux_1+55,BYTE);
}
if (aux_2<10){
Serial.print(aux_2 + 48,BYTE);
}
else{
Serial.print(aux_2 + 55,BYTE);
}
Serial.print(" ");
}
Here is the USB output using the Arduino IDE serial port terminal
Step 3: Reading T5557 cards:
The next example of use of the RFID module is the reading of T5557 rewritable cards using Arduino.
| Command |
| 0x87 - Set Auto Mode: Byte track mode - Parity decoded - Manchester RF/64, 7 blocks, without password. |
| FF 01 09 87 01 01 07 00 10 20 30 40 3A |
Arduino code:
/*
* RFID module from Libelium for Arduino
* Basic program, just Read T5557 (rewritable) cards
*
* Copyright (C) 2008 Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Version 0.1
* Author: Marcos Yarza
*/
// var
int led = 13;
byte block1_byte1 = 0x00;
byte block1_byte2 = 0x00;
byte block1_byte3 = 0x00;
byte block1_byte4 = 0x00;
byte block2_byte1 = 0x00;
byte block2_byte2 = 0x00;
byte block2_byte3 = 0x00;
byte block2_byte4 = 0x00;
byte block3_byte1 = 0x00;
byte block3_byte2 = 0x00;
byte block3_byte3 = 0x00;
byte block3_byte4 = 0x00;
byte block4_byte1 = 0x00;
byte block4_byte2 = 0x00;
byte block4_byte3 = 0x00;
byte block4_byte4 = 0x00;
byte block5_byte1 = 0x00;
byte block5_byte2 = 0x00;
byte block5_byte3 = 0x00;
byte block5_byte4 = 0x00;
byte block6_byte1 = 0x00;
byte block6_byte2 = 0x00;
byte block6_byte3 = 0x00;
byte block6_byte4 = 0x00;
byte block7_byte1 = 0x00;
byte block7_byte2 = 0x00;
byte block7_byte3 = 0x00;
byte block7_byte4 = 0x00;
int val = 0;
void setup(){
// Start serial port 19200 bps
Serial.begin(19200);
pinMode(led, OUTPUT);
delay(500);
// Setting Auto Read Mode - T5557 7 blocks without password
Serial.print(0xFF,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x09,BYTE);
Serial.print(0x87,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x07,BYTE);
Serial.print(0x00,BYTE);
Serial.print(0x10,BYTE);
Serial.print(0x20,BYTE);
Serial.print(0x30,BYTE);
Serial.print(0x40,BYTE);
Serial.print(0x3A,BYTE);
delay(500);
Serial.flush();
Serial.println();
Serial.println();
Serial.println("RFID module started in Auto Read Mode");
}
void loop(){
val = Serial.read();
while (val != 0xff){
Serial.println("Waiting card");
val = Serial.read();
delay(1000);
}
// Serial.read(); // we read ff
Serial.read(); // we read 01
Serial.read(); // we read 1d
Serial.read(); // we read 10
block1_byte1 = Serial.read(); // we read block 1 byte 1
block1_byte2 = Serial.read(); // we read block 1 byte 2
block1_byte3 = Serial.read(); // we read block 1 byte 3
block1_byte4 = Serial.read(); // we read block 1 byte 4
block2_byte1 = Serial.read(); // we read block 2 byte 1
block2_byte2 = Serial.read(); // we read block 2 byte 2
block2_byte3 = Serial.read(); // we read block 2 byte 3
block2_byte4 = Serial.read(); // we read block 2 byte 4
block3_byte1 = Serial.read(); // we read block 3 byte 1
block3_byte2 = Serial.read(); // we read block 3 byte 2
block3_byte3 = Serial.read(); // we read block 3 byte 3
block3_byte4 = Serial.read(); // we read block 3 byte 4
block4_byte1 = Serial.read(); // we read block 4 byte 1
block4_byte2 = Serial.read(); // we read block 4 byte 2
block4_byte3 = Serial.read(); // we read block 4 byte 3
block4_byte4 = Serial.read(); // we read block 4 byte 4
block5_byte1 = Serial.read(); // we read block 5 byte 1
block5_byte2 = Serial.read(); // we read block 5 byte 2
block5_byte3 = Serial.read(); // we read block 5 byte 3
block5_byte4 = Serial.read(); // we read block 5 byte 4
block6_byte1 = Serial.read(); // we read block 6 byte 1
block6_byte2 = Serial.read(); // we read block 6 byte 2
block6_byte3 = Serial.read(); // we read block 6 byte 3
block6_byte4 = Serial.read(); // we read block 6 byte 4
block7_byte1 = Serial.read(); // we read block 7 byte 1
block7_byte2 = Serial.read(); // we read block 7 byte 2
block7_byte3 = Serial.read(); // we read block 7 byte 3
block7_byte4 = Serial.read(); // we read block 7 byte 4
Serial.read(); // we read checksum
// Led blink
for(int i = 0;i<4;i++){
digitalWrite(led,HIGH);
delay(500);
digitalWrite(led,LOW);
delay(500);
}
// Printing the code of the card
Serial.println();
Serial.println("T5557 card found - Data read: ");
Serial.println("---------------------------------------");
Serial.print("-- Block 1 -- | "); writeByte(block1_byte1);
Serial.print(" | "); writeByte(block1_byte2);
Serial.print(" | "); writeByte(block1_byte3);
Serial.print(" | "); writeByte(block1_byte4);
Serial.println(" |");
Serial.print("-- Block 2 -- | "); writeByte(block2_byte1);
Serial.print(" | "); writeByte(block2_byte2);
Serial.print(" | "); writeByte(block2_byte3);
Serial.print(" | "); writeByte(block2_byte4);
Serial.println(" |");
Serial.print("-- Block 3 -- | "); writeByte(block3_byte1);
Serial.print(" | "); writeByte(block3_byte2);
Serial.print(" | "); writeByte(block3_byte3);
Serial.print(" | "); writeByte(block3_byte4);
Serial.println(" |");
Serial.print("-- Block 4 -- | "); writeByte(block4_byte1);
Serial.print(" | "); writeByte(block4_byte2);
Serial.print(" | "); writeByte(block4_byte3);
Serial.print(" | "); writeByte(block4_byte4);
Serial.println(" |");
Serial.print("-- Block 5 -- | "); writeByte(block5_byte1);
Serial.print(" | "); writeByte(block5_byte2);
Serial.print(" | "); writeByte(block5_byte3);
Serial.print(" | "); writeByte(block5_byte4);
Serial.println(" |");
Serial.print("-- Block 6 -- | "); writeByte(block6_byte1);
Serial.print(" | "); writeByte(block6_byte2);
Serial.print(" | "); writeByte(block6_byte3);
Serial.print(" | "); writeByte(block6_byte4);
Serial.println(" |");
Serial.print("-- Block 7 -- | "); writeByte(block7_byte1);
Serial.print(" | "); writeByte(block7_byte2);
Serial.print(" | "); writeByte(block7_byte3);
Serial.print(" | "); writeByte(block7_byte4);
Serial.println(" |");
Serial.println("---------------------------------------");
Serial.println();
}
//Write a byte (hex) in ASCII
void writeByte(byte data){
int aux_1 = 0;
int aux_2 = 0;
aux_1=data/16;
aux_2=data%16;
if (aux_1<10){
Serial.print(aux_1 + 48,BYTE);
}
else{
Serial.print(aux_1+55,BYTE);
}
if (aux_2<10){
Serial.print(aux_2 + 48,BYTE);
}
else{
Serial.print(aux_2 + 55,BYTE);
}
Serial.print(" ");
}
Serial output (Arduino Serial Monitor)
As you can see, Arduino reads 7 blocks of memory (4 bytes each):
Block 1: 52 58 8B 45
Block 2: 02 02 02 02
Block 3: 03 03 03 03
Block 4: 04 04 04 04
Block 5: 05 05 05 05
Block 6: 06 06 06 06
Block 7: 00 00 00 00
Step 4: Reading / writing T5557 cards:
The next example for this module is the writing/reading of RFID cards. We program an Arduino board to read a T5557 card, then Arduino writes blocks 2, 3, 4, 5 and 6 of the card with an incremental value each time.
| Command |
| 0x10 - Read Tag: Byte track Mode - Manchester RF/64, 7 Blocks |
| 0x40 - Configure Tag programming parameters: |
| WG = 50 (0x32) |
| SG = 100 0x64) |
| ONE = 90 (0x5A) |
| ZERO = 30 (0x1E) |
| PADF = 96 (0x60) |
| 0x20 - Write Tag |
Warning!!!
Don't write block 0, 1 or 7 if you are not an advanced user!!!
- Block 0 - It should not be programmed with arbitrary values otherwise the tag may not be accessed again.
- Block 1 - This block can be used for “Byte Track” method. What is programmed in this block should be traced by SM125 (typically 52 58 8B 45).
- Block 7 - This block can be used as general purpose data block or can be used as password. If password is enabled, access to the tag requires the password that matches block7 content. Once password is enabled and if the block7 data is unknown then it is impossible to access the tag again unless with the correct 4 byte password.
Arduino code:
/*
* RFID module from Libelium for Arduino
* Basic program, Read and write T5557 cards
*
* Copyright (C) 2010 Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Version 0.1
* Author: Marcos Yarza
*/
// var
int led = 13;
byte block1_byte1 = 0x00;
byte block1_byte2 = 0x00;
byte block1_byte3 = 0x00;
byte block1_byte4 = 0x00;
byte block2_byte1 = 0x00;
byte block2_byte2 = 0x00;
byte block2_byte3 = 0x00;
byte block2_byte4 = 0x00;
byte block3_byte1 = 0x00;
byte block3_byte2 = 0x00;
byte block3_byte3 = 0x00;
byte block3_byte4 = 0x00;
byte block4_byte1 = 0x00;
byte block4_byte2 = 0x00;
byte block4_byte3 = 0x00;
byte block4_byte4 = 0x00;
byte block5_byte1 = 0x00;
byte block5_byte2 = 0x00;
byte block5_byte3 = 0x00;
byte block5_byte4 = 0x00;
byte block6_byte1 = 0x00;
byte block6_byte2 = 0x00;
byte block6_byte3 = 0x00;
byte block6_byte4 = 0x00;
byte block7_byte1 = 0x00;
byte block7_byte2 = 0x00;
byte block7_byte3 = 0x00;
byte block7_byte4 = 0x00;
int val = 0;
byte valueToStore = 0x00;
void setup(){
// Start serial port 19200 bps
Serial.begin(19200);
pinMode(led, OUTPUT);
delay(500);
// Configure Tag programming parameters
// Command: FF 01 06 40 32 64 5A 1E 60 B5
Serial.print(0xFF,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x06,BYTE);
Serial.print(0x40,BYTE);
Serial.print(0x32,BYTE);
Serial.print(0x64,BYTE);
Serial.print(0x5A,BYTE);
Serial.print(0x1E,BYTE);
Serial.print(0x60,BYTE);
Serial.print(0xB5,BYTE);
delay(500);
Serial.flush();
}
void loop(){
// Read the card: Byte track Mode - Manchester RF/64 7 blocks
readTag(0x01,0x07);
digitalWrite(led,HIGH);
Serial.println("Waiting card to read");
Serial.flush();
delay(5000);
digitalWrite(led,LOW);
getTag();
// Add 1 to the value to store in card
if (valueToStore == 0xFF){
valueToStore = 0x00;
}
else {
valueToStore++;
}
delay(5000);
// Write card
Serial.println("Waiting card to write ...");
Serial.println("Put the card on the reader...");
digitalWrite(led,HIGH);
delay(5000);
Serial.print("Writing: ");
writeByte(valueToStore);
Serial.println();
// We write blocks 2, 3, 4, 5 and 6
// Warning !!!
// don't write block 1 or 7 if you are not an advanced user!!!
writeTag(0x02,valueToStore,valueToStore,valueToStore,valueToStore);
writeTag(0x03,valueToStore,valueToStore,valueToStore,valueToStore);
writeTag(0x04,valueToStore,valueToStore,valueToStore,valueToStore);
writeTag(0x05,valueToStore,valueToStore,valueToStore,valueToStore);
writeTag(0x06,valueToStore,valueToStore,valueToStore,valueToStore);
Serial.println();
Serial.println("Card ready!!!");
delay(5000);
}
// Command for read a Tag
void readTag(byte modeRead, byte blocks){
// Read command: FF 01 03 10 02 02 18
byte checksum = 0x01 + 0x03 + 0x10 + modeRead + blocks;
Serial.print(0xFF,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x03,BYTE);
Serial.print(0x10,BYTE);
Serial.print(modeRead,BYTE);
Serial.print(blocks,BYTE);
Serial.print(checksum,BYTE);
}
// Write a byte (hex) in ASCII
void writeByte(byte data){
int aux_1 = 0;
int aux_2 = 0;
aux_1=data/16;
aux_2=data%16;
if (aux_1<10){
Serial.print(aux_1 + 48,BYTE);
}
else{
Serial.print(aux_1+55,BYTE);
}
if (aux_2<10){
Serial.print(aux_2 + 48,BYTE);
}
else{
Serial.print(aux_2 + 55,BYTE);
}
Serial.print(" ");
}
void writeTag(byte block, byte data0, byte data1, byte data2, byte data3){
byte checksum = 0x01 + 0x06 + 0x20 + block + data0 + data1 + data2 + data3;
Serial.print(0xFF,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x06,BYTE);
Serial.print(0x20,BYTE);
Serial.print(block,BYTE);
Serial.print(data0,BYTE);
Serial.print(data1,BYTE);
Serial.print(data2,BYTE);
Serial.print(data3,BYTE);
Serial.print(checksum,BYTE);
delay(2000);
}
// Reading T5557 tags 7 blocks
void getTag(){
val = Serial.read(); // we read ff
if (val > 0){
Serial.read(); // we read 01
Serial.read(); // we read 0d
Serial.read(); // we read 10
block1_byte1 = Serial.read(); // we read block 1 byte 1
block1_byte2 = Serial.read(); // we read block 1 byte 2
block1_byte3 = Serial.read(); // we read block 1 byte 3
block1_byte4 = Serial.read(); // we read block 1 byte 4
block2_byte1 = Serial.read(); // we read block 2 byte 1
block2_byte2 = Serial.read(); // we read block 2 byte 2
block2_byte3 = Serial.read(); // we read block 2 byte 3
block2_byte4 = Serial.read(); // we read block 2 byte 4
block3_byte1 = Serial.read(); // we read block 3 byte 1
block3_byte2 = Serial.read(); // we read block 3 byte 2
block3_byte3 = Serial.read(); // we read block 3 byte 3
block3_byte4 = Serial.read(); // we read block 3 byte 4
block4_byte1 = Serial.read(); // we read block 4 byte 1
block4_byte2 = Serial.read(); // we read block 4 byte 2
block4_byte3 = Serial.read(); // we read block 4 byte 3
block4_byte4 = Serial.read(); // we read block 4 byte 4
block5_byte1 = Serial.read(); // we read block 5 byte 1
block5_byte2 = Serial.read(); // we read block 5 byte 2
block5_byte3 = Serial.read(); // we read block 5 byte 3
block5_byte4 = Serial.read(); // we read block 5 byte 4
block6_byte1 = Serial.read(); // we read block 6 byte 1
block6_byte2 = Serial.read(); // we read block 6 byte 2
block6_byte3 = Serial.read(); // we read block 6 byte 3
block6_byte4 = Serial.read(); // we read block 6 byte 4
block7_byte1 = Serial.read(); // we read block 7 byte 1
block7_byte2 = Serial.read(); // we read block 7 byte 2
block7_byte3 = Serial.read(); // we read block 7 byte 3
block7_byte4 = Serial.read(); // we read block 7 byte 4
Serial.read(); // we read checksum
// Led blink
for(int i = 0;i<4;i++){
digitalWrite(led,HIGH);
delay(500);
digitalWrite(led,LOW);
delay(500);
}
// Printing the code of the card
Serial.println();
Serial.println("T5557 card found - Data read: ");
Serial.println("---------------------------------------");
Serial.print("-- Block 1 -- | "); writeByte(block1_byte1);
Serial.print(" | "); writeByte(block1_byte2);
Serial.print(" | "); writeByte(block1_byte3);
Serial.print(" | "); writeByte(block1_byte4);
Serial.println(" |");
Serial.print("-- Block 2 -- | "); writeByte(block2_byte1);
Serial.print(" | "); writeByte(block2_byte2);
Serial.print(" | "); writeByte(block2_byte3);
Serial.print(" | "); writeByte(block2_byte4);
Serial.println(" |");
Serial.print("-- Block 3 -- | "); writeByte(block3_byte1);
Serial.print(" | "); writeByte(block3_byte2);
Serial.print(" | "); writeByte(block3_byte3);
Serial.print(" | "); writeByte(block3_byte4);
Serial.println(" |");
Serial.print("-- Block 4 -- | "); writeByte(block4_byte1);
Serial.print(" | "); writeByte(block4_byte2);
Serial.print(" | "); writeByte(block4_byte3);
Serial.print(" | "); writeByte(block4_byte4);
Serial.println(" |");
Serial.print("-- Block 5 -- | "); writeByte(block5_byte1);
Serial.print(" | "); writeByte(block5_byte2);
Serial.print(" | "); writeByte(block5_byte3);
Serial.print(" | "); writeByte(block5_byte4);
Serial.println(" |");
Serial.print("-- Block 6 -- | "); writeByte(block6_byte1);
Serial.print(" | "); writeByte(block6_byte2);
Serial.print(" | "); writeByte(block6_byte3);
Serial.print(" | "); writeByte(block6_byte4);
Serial.println(" |");
Serial.print("-- Block 7 -- | "); writeByte(block7_byte1);
Serial.print(" | "); writeByte(block7_byte2);
Serial.print(" | "); writeByte(block7_byte3);
Serial.print(" | "); writeByte(block7_byte4);
Serial.println(" |");
Serial.println("---------------------------------------");
Serial.println();
}
else Serial.println("No card");
}
Serial monitor output
Step 5: Reading / writing T5557 cards using password:
Warning!!!
Once password is enabled, if the block 7 data is unknown then it is impossible to access the card again unless with the correct 4 byte password.
For activating the password, we'll program the block 0, we have to be careful programming this block otherwise the tag may not be accessed again.
Activate password in the card
First of all, we have to discover the password (4 bytes), so we have to read the block 7 in the card (see the above example).
| Password for our card: |
| 00 00 00 00 |
Once we know the password of the card we can activate it using this command
| Command for activating the password in the card |
| FF 01 0A 23 00 00 14 80 F0 XX XX XX XX CHECKSUM |
| XX XX XX XX => Password |
Writing data in a protected card
For writing data using password we'll use command 0x23
| Write with pass command |
| FF 01 0A 23 BLOCK DATA0 DATA1 DATA2 DATA3 XX XX XX XX CHECKSUM |
| BLOCK: Block to write (0x02, 0x03,0x04, 0x05, 0x06 or 0x07) |
| DATA0, DATA1, DATA2, DATA3: Data bytes to store (4 bytes) |
| XX XX XX XX: Password (4 bytes) |
Reading data in a protected card
For reading data in a protected card, we'll use command 0x13
| Read with pass command |
| FF 01 07 13 01 BLOCKS XX XX XX XX CHECKSUM |
| BLOCKS: Blocks to read (1-7) |
| XX XX XX XX: Pasword |
We also could use Auto read mode)
Deactivate password in the card
Just sending this command you can deactivate the password in the card.
| FF 01 0A 23 00 00 14 80 E0 XX XX XX XX CHECKSUM |
| XX XX XX XX => Password |
Step 6: Using the sleep mode:
An advantage of our RFID module is that it has got a sleep mode that let us save power hen we don't use it. Go to the sleep mode is very easy, just sending a command. When the RFID is in sleeping mode and we want to wake up it we need to provide it a HIGH (5V) pulse to the reset pin. We'll use one of the Arduino outputs to control the reset signal. For making the connection we'll use a cable from output 8 to RST pin in the XBee shield (look picture).
| Connection |
| Arduino: pin 8 |
| XBee shield: RST (pin 5) |
| Command to go to sleep mode: |
| FF 01 01 60 62 |
Arduino code:
/*
* RFID module from Libelium for Arduino
* Basic program, just Read EM1000 cards and go to sleep mode
*
* Copyright (C) 2010 Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Version 0.1
* Author: Marcos Yarza
*/
// var
int led = 13;
int wake_pin = 8;
byte data_1 = 0x00;
byte data_2 = 0x00;
byte data_3 = 0x00;
byte data_4 = 0x00;
byte data_5 = 0x00;
int val = 0;
void setup(){
// Start serial port 19200 bps
Serial.begin(19200);
pinMode(led, OUTPUT);
pinMode(wake_pin, OUTPUT);
delay(500);
Serial.flush();
Serial.println();
Serial.println("RFID module started in Auto Read Mode");
}
void loop(){
// Setting Auto Read Mode - EM4102 Decoded Mode - No password
// command: FF 01 09 87 01 03 02 00 10 20 30 40 37
Serial.print(0xFF,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x09,BYTE);
Serial.print(0x87,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x03,BYTE);
Serial.print(0x02,BYTE);
Serial.print(0x00,BYTE);
Serial.print(0x10,BYTE);
Serial.print(0x20,BYTE);
Serial.print(0x30,BYTE);
Serial.print(0x40,BYTE);
Serial.print(0x37,BYTE);
Serial.flush();
digitalWrite(led, HIGH);
digitalWrite(wake_pin, LOW);
// wait for Tag
val = Serial.read();
while (val != 0xff){
Serial.println("Waiting card");
val = Serial.read();
delay(1000);
}
// Serial.read(); // we read ff
Serial.read(); // we read 01
Serial.read(); // we read 06
Serial.read(); // we read 10
data_1 = Serial.read(); // we read data 1
data_2 = Serial.read(); // we read data 2
data_3 = Serial.read(); // we read data 3
data_4 = Serial.read(); // we read data 4
data_5 = Serial.read(); // we read data 5
Serial.read(); // we read checksum
// Printing the code of the card
Serial.println();
Serial.print("EM4100 card found - Code: ");
writeByte(data_1);
writeByte(data_2);
writeByte(data_3);
writeByte(data_4);
writeByte(data_5);
Serial.println();
Serial.println();
digitalWrite(led,LOW);
// go to sleep mode for 25 seconds
Serial.println("Go to sleep mode for 25s ...");
// Sleep command
Serial.print(0xFF,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x01,BYTE);
Serial.print(0x60,BYTE);
Serial.print(0x62,BYTE);
// wait for 25 sec
delay(25000);
// wake up
digitalWrite(wake_pin,HIGH);
delay(500);
digitalWrite(wake_pin,LOW);
}
//Write a byte (hex) in ASCII
void writeByte(byte data){
int aux_1 = 0;
int aux_2 = 0;
aux_1=data/16;
aux_2=data%16;
if (aux_1<10){
Serial.print(aux_1 + 48,BYTE);
}
else{
Serial.print(aux_1+55,BYTE);
}
if (aux_2<10){
Serial.print(aux_2 + 48,BYTE);
}
else{
Serial.print(aux_2 + 55,BYTE);
}
Serial.print(" ");
}
Step 7: Video-Tutorial:
Here's an explanatory video, which shows the whole process developed in this tutorial:
Step 8: Fritzing libraries:
RFID 125kHz Module for Arduino
Download
RFID 125kHz Module for Arduino can be connected to Arduino using a XBee shield and will communicate it using the Arduino serial port (UART).
You can download our Fritzing libraries from this area.
Links and Documentation
Links and Documentation:
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