Erfarenheter av RFID från Raspberry Pi.

Innehåll.

Tillbaka till Raspbery Pi
Inledning.
Inkoppling.
Installation.
Avläsa en tagg.
Referenser.

Inledning.

Här beskrivs hur man kan använda en rfid med Raspberry Pi.
Rfid finns i flera typer beroende på vilket frekvensområde de arbetar i. Områdene är: LF 120 -150 kHz, HF 13,56 MHz samt UHF 433 MHz. LF har en räckvidd på omkring 10 cm. HF en räckvidd på cirka 1 meter. UHF når 10 meter eller mer.
RFID 125 kHz module arbetar på 125 kHz.

Till början.

Inkoppling.

0. Öppna ett terminalfönster på Raspberry Pi, eller anslut till Raspberry Pi via SSH.
1. Ta en backup på filen /boot/cmdline.txt.
sudo cp /boot/cmdline.txt /boot/cmdline_backup.txt
2. Editera filen /boot/cmdline.txt:
sudo vi /boot/cmdline.txt
Filen innehåller:
dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 $
Radera parametrarna som pekar på UART serieporten (ttyAMA0):
dwc_otg.lpm_enable=0 console=tty1 $

3. Kommentera ut följande rad i filen /etc/inittab:
T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

4. Starta om Raspberry Pi
sudo reboot

Installation.

Följande program behöver installeras:
arduPi library
Reading T5557 cards:

/* * t5557_read.cpp * * 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 . * * Version 0.1 * Author: Anartz Nuin Jiménez */ //Include ArduPi library #include "arduPi.h" void writeByte(byte data); 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(200); Serial.flush(); printf("RFID module started in Auto Read Mode\n"); } void loop(){ val = Serial.read(); while (val != 0xff){ printf("Waiting card"); val = Serial.read(); delay(200); } // 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(200); digitalWrite(led,LOW); delay(200); } // Printing the code of the card printf("\n"); printf("T5557 card found - Data read: \n"); printf("---------------------------------------\n"); printf("-- Block 1 -- | "); writeByte(block1_byte1); printf(" | "); writeByte(block1_byte2); printf(" | "); writeByte(block1_byte3); printf(" | "); writeByte(block1_byte4); printf(" |\n"); printf("-- Block 2 -- | "); writeByte(block2_byte1); printf(" | "); writeByte(block2_byte2); printf(" | "); writeByte(block2_byte3); printf(" | "); writeByte(block2_byte4); printf(" |\n"); printf("-- Block 3 -- | "); writeByte(block3_byte1); printf(" | "); writeByte(block3_byte2); printf(" | "); writeByte(block3_byte3); printf(" | "); writeByte(block3_byte4); printf(" |\n"); printf("-- Block 4 -- | "); writeByte(block4_byte1); printf(" | "); writeByte(block4_byte2); printf(" | "); writeByte(block4_byte3); printf(" | "); writeByte(block4_byte4); printf(" |\n"); printf("-- Block 5 -- | "); writeByte(block5_byte1); printf(" | "); writeByte(block5_byte2); printf(" | "); writeByte(block5_byte3); printf(" | "); writeByte(block5_byte4); printf(" |\n"); printf("-- Block 6 -- | "); writeByte(block6_byte1); printf(" | "); writeByte(block6_byte2); printf(" | "); writeByte(block6_byte3); printf(" | "); writeByte(block6_byte4); printf(" |\n"); printf("-- Block 7 -- | "); writeByte(block7_byte1); printf(" | "); writeByte(block7_byte2); printf(" | "); writeByte(block7_byte3); printf(" | "); writeByte(block7_byte4); printf(" |\n"); printf("---------------------------------------\n"); } //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){ printf("%x",aux_1 + 48); } else{ printf("%x",aux_1+55); } if (aux_2 < 10){ printf("%x",aux_2 + 48); } else{ printf("%x",aux_2 + 55); } printf(" "); } int main (){ setup(); while(1){ loop(); } return (0); }
Kompilera:
g++ -lrt -lpthread t5557_read.cpp arduPi.cpp -o t5557_read
Köra programmet:
sudo ./t5557_read

Till början.

Avläsa en rfid-tagg.

Starta programmet:
sudo ./t5557_read

Referenser.

Cooking Hacks.

Till början.