Serial and RFID - Comms

Using Arduino Programming Questions
1

Hello,

I got a arduino UNO and a RFID Module for Xmas.
I can set the RFID Module in to read mode and can also send a standby command.

I am now trying to get my code to read the ID from the Tag and Print to Serial all on one line.

This is what I have do so far.

#include <SoftwareSerial.h> //Include softSerial in the project
SoftwareSerial mySerial(10, 11); //softSerial rx, tx Pins

int incomingByte = 0;  //incoming serial data

void setup()
{
  //Start Hardware serial comms
  Serial.begin(9600);
  
  //start software comms
  mySerial.begin(9600);
  
}

void loop()
{
  
  //Send HEX command to mySerial
  int inByte = Serial.read();
  switch (inByte){
    
    case 'r':
    Serial.println("Auto read card Enabled");
    mySerial.write(0x02);
    break;
    
    case 'p':
    Serial.println("Standby Mode Enabled");
    mySerial.write(0xab);  //Not sure if there is a better way to send this all at once?
    mySerial.write(0x02);  //Not sure if there is a better way to send this all at once?
    mySerial.write(0x10);  //Not sure if there is a better way to send this all at once?
    break;
    
    
  }
  
  //Send data only when received data
  if (mySerial.available()) {
    //Read the incomming byte:
    incomingByte = mySerial.read();
    
    //Send what come from mySerial to serial
      Serial.print(incomingByte, HEX);
  }


  delay(100);
}

This is what I get in Serial with this code.

ac
d0
2 <- Should be 02, but shows it as only 2?? Same with other ID's that start with a 0
4a

I want it to read -> acd0024a then a new line.

I think I need to do something with "if (mySerial.available())" like <4 or >4. I'me not sure, Also a buffer flush?

This is the RFID module -> http://www.ebay.co.uk/itm/140642657638

Any help would be much appreciated.

--Mick--

2

Serial.print(integer) does not print leading zeroes. If you want them you have to insert them yourself:

if (value < 16)
    Serial.print("0");
Serial.print(value, HEX);

Checking for 3 or more characters in the input buffer is a good idea:

    if (mySerial.available > 2)
        {
        result[0] = mySerial.read();
        result[1] = mySerial.read();
        result[2] = mySerial.read();

        }

}

3

I documented an RFID system here:

4

Checking for 3 or more characters in the input buffer is a good idea:

    if (mySerial.available > 2)

It's even better when you remember the ()s.

    if (mySerial.available() > 2)