Hi, I have two Innovations ID-20 RFID Readers and an Arduino Mega 2560. I followed the tutorial on bildr http://bildr.org/2011/02/rfid-arduino/ and it works for one RFID Reader
But when I tried adding the other RFID Reade (I duplicated certain segments of the code), it refuses to work... basically, both readers would not read... Can anyone help me?
int RFIDResetPin = 13;
int RFIDResetPin2 = 12;
//Register your RFID tags here
char tag1[13] = "100045AC8871";
char tag2[13] = "1700DEF82C1D";
char tag3[13] = "01023C013A04";
char tag4[13] = "01023101093A";
char tag5[13] = "01023C0A4376";
char tag6[13] = "01023C000E31";
char tag7[13] = "01023C0A3207";
char tag8[13] = "1A004116317C";
char tag9[13] = "1E009A81F9FC";
char tag10[13] = "1A004162261F";
void setup(){
Serial.begin(9600);
Serial1.begin(9600);
Serial2.begin(9600);
pinMode(RFIDResetPin, OUTPUT);
pinMode(RFIDResetPin2, OUTPUT);
digitalWrite(RFIDResetPin, HIGH);
digitalWrite(RFIDResetPin2, HIGH);
}
void loop(){
char tagString[13];
int index = 0;
boolean reading = false;
while(Serial1.available()){
int readByte = Serial1.read(); //read next available byte
if(readByte == 2) reading = true; //begining of tag
if(readByte == 3) reading = false; //end of tag
if(reading && readByte != 2 && readByte != 10 && readByte != 13){
//store the tag
tagString[index] = readByte;
index ++;
}
}
while(Serial2.available()){
int readByte = Serial2.read(); //read next available byte
if(readByte == 2) reading = true; //begining of tag
if(readByte == 3) reading = false; //end of tag
if(reading && readByte != 2 && readByte != 10 && readByte != 13){
//store the tag
tagString[index] = readByte;
index ++;
}
}
checkTag(tagString); //Check if it is a match
clearTag(tagString); //Clear the char of all value
resetReader(); //Reset the RFID reader
}
void checkTag(char tag[]){
///////////////////////////////////
//Check the read tag against known tags
///////////////////////////////////
if(strlen(tag) == 0) return; //empty, no need to contunue
if(compareTag(tag, tag1)){ // if matched tag1, do this
Serial.println("received1");
}else if(compareTag(tag, tag2)){ //if matched tag2, do this
Serial.println("received2");
}else if(compareTag(tag, tag3)){
lightLED(4);
}else if(compareTag(tag, tag4)){
lightLED(5);
}else if(compareTag(tag, tag5)){
lightLED(6);
}else if(compareTag(tag, tag6)){
lightLED(7);
}else if(compareTag(tag, tag7)){
lightLED(8);
}else if(compareTag(tag, tag8)){
lightLED(9);
}else if(compareTag(tag, tag9)){
lightLED(10);
}else if(compareTag(tag, tag10)){
lightLED(11);
}else{
Serial.println(tag); //read out any unknown tag
}
}
void lightLED(int pin){
///////////////////////////////////
//Turn on LED on pin "pin" for 250ms
///////////////////////////////////
Serial.println(pin);
digitalWrite(pin, HIGH);
delay(250);
digitalWrite(pin, LOW);
}
void resetReader(){
///////////////////////////////////
//Reset the RFID reader to read again.
///////////////////////////////////
digitalWrite(RFIDResetPin, LOW);
digitalWrite(RFIDResetPin2, LOW);
digitalWrite(RFIDResetPin, HIGH);
digitalWrite(RFIDResetPin2, HIGH);
delay(150);
}
void clearTag(char one[]){
///////////////////////////////////
//clear the char array by filling with null - ASCII 0
//Will think same tag has been read otherwise
///////////////////////////////////
for(int i = 0; i < strlen(one); i++){
one[i] = 0;
}
}
boolean compareTag(char one[], char two[]){
///////////////////////////////////
//compare two value to see if same,
//strcmp not working 100% so we do this
///////////////////////////////////
if(strlen(one) == 0) return false; //empty
for(int i = 0; i < 12; i++){
if(one[i] != two[i]) return false;
}
return true; //no mismatches
}