Hello,
I am using a 125kHz ID-12LA RFID Reader, a breakout board and an Arduino Leonardo.
I soldered the ID-12LA to the breakout board, then I soldered some small wires to pins 1,2,7,9 and 11.
When I place a tag near the reader, nothing pops up (the tag's ID) on the serial monitor.
The serial monitor works fine if I use Serial.write("blah"); , which indicates that my wiring is wrong somewhere.
Should you wish to check that I've followed the instructions right, I got the whole project from http://www.instructables.com/id/Reading-RFID-Tags-with-an-Arduino/
In the attached image, this is the wiring:
Arduino --> ID-12LA
Pin 5 --> Pin 9 (D0)
Pin 4 --> Pin 9 (D0)
GND --> Pin 7 (FS)
GND --> Pin 1 (GND)
+5V --> Pin 2 (RESET)
+5V --> Pin 11 (+5V)
Please tell me if you see anything wrong with my wiring or this code:
#include <SoftwareSerial.h>
// The RFID module's TX pin needs to be connected to the Arduino.
#define rxPin 4
#define txPin 5
// Create a software serial object for the connection to the RFID module
SoftwareSerial rfid = SoftwareSerial( rxPin, txPin );
// Set up outputs
#define futureOutput 12
#define ledPin 13
// Specify how long the output should be held.
#define unlockSeconds 2
// 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). You can expand
// or shrink this as you see fit. Tags 2 and 3 are only there for example.
char* allowedTags[] = {
"[INSERT IDENTIFIER HERE]", // Tag 1
"2900940E95", // Tag 2
"ABC123DE45", // Tag 3
};
// List of names to associate with the matching tag IDs
char* tagName[] = {
"[ADD YOUR NAME HERE]", // Tag 1
"Mark Trussell", // Tag 2
"NAME 3", // 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(futureOutput, OUTPUT);
//digitalWrite(futureOutput, LOW);
Serial.begin(9600); // Serial port for connection to host
rfid.begin(9600); // Serial port for connection to RFID module
delay(5000);
Serial.println("RFID Reader Initialized");
}
/**
* 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(futureOutput, HIGH);
delay(unlockSeconds * 1000);
digitalWrite(futureOutput, 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);
}
Thanks!!!
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