I would really appreciate some programming help here. I have a working sketch using three rfid tags. I am using the reader to pop open the drivers side door on my hot rod using a relay shield, arduino, and the rfid reader. What i would like to do is have two separate tags open the drivers door using the #7 pin on the relay - say wile e. coyote and the road runner (see the program). Then have one tag - bugs bunny- open the passenger door using the #6 pin on the relay. I swiped the program from a website to open a lock on a door and I have done a few changes to make it work for me but having it do this is a bit more than I can figure out how to do.
/**
* RFID Access Control Single
*
* This project implements a single stand-alone RFID access control
* system that can operate independently of a host computer or any
* other device. It uses either an ID-12 RFID reader module from ID
* Innovations or an RDM630 RFID reader module from Seeed Studio to
* scan for 125KHz RFID tags, and when a recognised tag is identified
* it toggles an output for a configurable duration, typically 2
* seconds. The output can then be used to control a relay to trip an
* electric striker plate to release a door lock.
*
* Because this project is intended to provide a minimal working system
* it does not have any provision for database updates to be managed
* externally from a host, so updates to the accepted cards must be
* made by changing the values in the code, recompiling the program,
* and re-uploading it to the Arduino. It does however report card
* readings (both successful and unsuccessful) via the serial
* connection so you can monitor the system using a connected computer.
*
* Some of this code was inspired by Tom Igoe's excellent RFID tutorial
* which is detailed on his blog at:
* http://www.tigoe.net/pcomp/code/category/PHP/347
* And also from the ID-12 example code on the Arduino Playground at:
* http://www.arduino.cc/playground/Code/ID12
*
* Copyright Jonathan Oxer <jon@oxer.com.au>
* http://www.practicalarduino.com/projects/medium/rfid-access-control
*/
// Set up the serial connection to the RFID reader module. In order to
// keep the Arduino TX and RX pins free for communication with a host,
// the sketch uses the SoftwareSerial library to implement serial
// communications on other pins.
#include <SoftwareSerial.h>
// The RFID module's TX pin needs to be connected to the Arduino. Module
// RX doesn't need to be connected to anything since we won't send
// commands to it, but SoftwareSerial requires us to define a pin for
// TX anyway so you can either connect module RX to Arduino TX or just
// leave them disconnected.
// If you have built the circuit exactly as described in Practical
// Arduino, use pins D2 / D3:
#define rxPin 0
#define txPin 1
// If you are using the Freetronics RFID Lock Shield, use pins D4 / D5:
/* #define rxPin 0 */
/* #define txPin 1 */
// Create a software serial object for the connection to the RFID module
SoftwareSerial rfid = SoftwareSerial( rxPin, txPin );
// Set up outputs for the strike plate and status LEDs.
// If you have built the circuit exactly as described in Practical
// Arduino, use pins D12 and D13:
#define strikePlate 7
#define relay 6
#define ledPin 13
/* #define strikePlate 7 */
/* #define relay 6 */
/* #define ledPin 13 */
// Specify how long the strike plate should be held open.
#define unlockSeconds 1
// The tag database consists of two parts. The first part is an array of
// tag values with each tag taking up 5 bytes. The second is a list of
// names with one name for each tag (ie: group of 5 bytes).
char* allowedTags[] = {
"1E0011627B", // Tag 1
"1C00867BA8", // Tag 2
"1D00853BD7", // Tag 3
};
// List of names to associate with the matching tag IDs
char* tagName[] = {
"Wile E. Coyote", // Tag 1
"Road Runner", // Tag 2
"Bugs Bunny", // Tag 3
};
// Check the number of tags defined
int numberOfTags = sizeof(allowedTags)/sizeof(allowedTags[0]);
int incomingByte = 0; // To store incoming serial data
/**
* Setup
*/
void setup() {
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);
pinMode(strikePlate, OUTPUT);
digitalWrite(strikePlate, LOW);
Serial.begin(38400); // Serial port for connection to host
rfid.begin(9600); // Serial port for connection to RFID module
Serial.println("RFID reader starting up");
}
/**
* Loop
*/
void loop() {
byte i = 0;
byte val = 0;
byte checksum = 0;
byte bytesRead = 0;
byte tempByte = 0;
byte tagBytes[6]; // "Unique" tags are only 5 bytes but we need an extra byte for the checksum
char tagValue[10];
// Read from the RFID module. Because this connection uses SoftwareSerial
// there is no equivalent to the Serial.available() function, so at this
// point the program blocks while waiting for a value from the module
if((val = rfid.read()) == 2) { // Check for header
bytesRead = 0;
while (bytesRead < 12) { // Read 10 digit code + 2 digit checksum
val = rfid.read();
// Append the first 10 bytes (0 to 9) to the raw tag value
if (bytesRead < 10)
{
tagValue[bytesRead] = val;
}
// Check if this is a header or stop byte before the 10 digit reading is complete
if((val == 0x0D)||(val == 0x0A)||(val == 0x03)||(val == 0x02)) {
break; // Stop reading
}
// Ascii/Hex conversion:
if ((val >= '0') && (val <= '9')) {
val = val - '0';
}
else if ((val >= 'A') && (val <= 'F')) {
val = 10 + val - 'A';
}
// Every two hex-digits, add a byte to the code:
if (bytesRead & 1 == 1) {
// Make space for this hex-digit by shifting the previous digit 4 bits to the left
tagBytes[bytesRead >> 1] = (val | (tempByte << 4));
if (bytesRead >> 1 != 5) { // If we're at the checksum byte,
checksum ^= tagBytes[bytesRead >> 1]; // Calculate the checksum... (XOR)
};
} else {
tempByte = val; // Store the first hex digit first
};
bytesRead++; // Ready to read next digit
}
// Send the result to the host connected via USB
if (bytesRead == 12) { // 12 digit read is complete
tagValue[10] = '\0'; // Null-terminate the string
Serial.print("Tag read: ");
for (i=0; i<5; i++) {
// Add a leading 0 to pad out values below 16
if (tagBytes[i] < 16) {
Serial.print("0");
}
Serial.print(tagBytes[i], HEX);
}
Serial.println();
Serial.print("Checksum: ");
Serial.print(tagBytes[5], HEX);
Serial.println(tagBytes[5] == checksum ? " -- passed." : " -- error.");
// Show the raw tag value
//Serial.print("VALUE: ");
//Serial.println(tagValue);
// Search the tag database for this particular tag
int tagId = findTag( tagValue );
// Only fire the strike plate if this tag was found in the database
if( tagId > 0 )
{
Serial.print("Authorized tag ID ");
Serial.print(tagId);
Serial.print(": unlocking for ");
Serial.println(tagName[tagId - 1]); // Get the name for this tag from the database
unlock(); // Fire the strike plate to open the lock
} else {
Serial.println("Tag not authorized");
}
Serial.println(); // Blank separator line in output
}
bytesRead = 0;
}
}
/**
* Fire the relay to activate the strike plate for the configured
* number of seconds.
*/
void unlock() {
digitalWrite(ledPin, HIGH);
digitalWrite(strikePlate, HIGH);
delay(unlockSeconds * 1000);
digitalWrite(strikePlate, LOW);
digitalWrite(ledPin, LOW);
}
/**
* Search for a specific tag in the database
*/
int findTag( char tagValue[10] ) {
for (int thisCard = 0; thisCard < numberOfTags; thisCard++) {
// Check if the tag value matches this row in the tag database
if(strcmp(tagValue, allowedTags[thisCard]) == 0)
{
// The row in the database starts at 0, so add 1 to the result so
// that the card ID starts from 1 instead (0 represents "no match")
return(thisCard + 1);
}
}
// If we don't find the tag return a tag ID of 0 to show there was no match
return(0);
}