13.56Mhz RFID module Help

Products & Technology Bee series & WSN
#1

Is there any way to code this so I do not have to hit enter?
I need to print custom text for each card Id
if card = “cardId” then print “Chris”
else card = “cardId” then print “Brian” ect…

I know this is not how I would code it but it gives you an idea of what I am doing.

[code]#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3);
char txrxbuffer[255];

char get_readID[] = { 0xAA , 0x00, 0x03, 0x25, 0x26, 0x00, 0x00, 0xBB };
void setup()
{
Serial.begin(57600);
Serial.println(“Hit Enter to read the RFID number”);
mySerial.begin(9600);
}

void loop() // run over and over
{

int counter = 0;
if (mySerial.available())
Serial.print(mySerial.read(),HEX);

if (Serial.available()){
Serial.read();
Serial.println(">");
for (counter =0 ; counter < 8 ; counter++){
mySerial.write(get_readID[counter]);
}
}
}
[/code]

#2

Hi,
Here is my code , the customer_ID used Decimal number .

[code]#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3);
unsigned long cardId;
char customer_name[][10]={“Deray”,“Tobe”,“Mike”,“Chris”};
unsigned long customer_ID[]={3727903***,166308***,7334255***,3854747***};
char get_readID[] = { 0xAA , 0x00, 0x03, 0x25, 0x26, 0x00, 0x00, 0xBB };

void readNumber(void)
{
cardId = 0;
char counter = 0;
for (counter = 0 ; counter < 8 ; counter++){
mySerial.write(get_readID[counter]);
}
delay(200);
//succeed to read a card ID , return 11 byte data.
if(mySerial.available() == 11){
for(counter = 0; counter < 5 ; counter++) mySerial.read();
cardId = cardId | mySerial.read(); //get byte 1 to cardId
cardId = cardId << 8;
cardId = cardId | mySerial.read(); //get byte 2 to cardId
cardId = cardId << 8;
cardId = cardId | mySerial.read(); //get byte 3 to cardId
cardId = cardId << 8;
cardId = cardId | mySerial.read(); //get byte 4 to cardId
}
mySerial.flush();
}

void setup()
{
Serial.begin(9600);
mySerial.begin(9600);
}

void loop() // run over and over
{
readNumber();
int i;
for(i=0;i<2;i++)
{
if(cardId == customer_ID[i]){
Serial.print(“Customer name :”);
Serial.println(customer_name[i]);
Serial.print(“Card Number :”);
Serial.println(cardId);
}
}
delay(1000);
}[/code]

Regards,
Deray

#3

Thanks deray

Looks good I’ll try it!

Just a fast question what does the “11” do
if(mySerial.available() == 11){

And do you know how many names and card id’s I could use? I have about 60!

And is there away I could organize them in the code for quick editing?
Thanks Chris

#4

Hi ,Chris

if(mySerial.available() == 11)

When you send the read_id command(0xAA , 0x00, 0x03, 0x25, 0x26, 0x00, 0x00, 0xBB) to RFID module , and it succeed to read a card ID , it will return 11 byte data. So the mySerial cache is 11.

If you want to save 60 names and IDs , you have better to save them to a SD card or EEPROM.

Deray

#5

Thanks for your help I think that I have got it!

Everything is working fine even with the 60 names! Thanks

I just dont understand the text string declaration [][10]

“char customer_name[][10]”

and the “cardId = cardId << 8;”

#6

For “only” 60 names you could use PROGMEM to place strings in program memory instead of RAM. Watch out for wearout! Prog mem have a quite limited number of writes!

That’s basic C syntax…
customer_name is an array of ‘unknown’ (determined by initializer) length of 10-bytes strings (so every string can be at most 9 chars + trailing 0x00).
cardid = cardid <<8 (or, more briefly, cardid <<= 8) simply shifts left current cardid value by 8 bits, making space for next character.

BTW by using your 13.56MHz tags this way you have nearly no security, just like 125KHz read-only ones!

#7

I do not need any security with this one but thanks.

I do have another queston I get this

error: invalid conversion from ‘char*’ to ‘char’

here is the code

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3);

char firstName = 0;

unsigned long cardId;
char customer_name[][10]={“Deray”,“Tobe”,“Mike”,“Chris”};
unsigned long customer_ID[]={3727903***,166308***,7334255***,3854747***};
char get_readID[] = { 0xAA , 0x00, 0x03, 0x25, 0x26, 0x00, 0x00, 0xBB };

void readNumber(void)
{
cardId = 0;
char counter = 0;
for (counter = 0 ; counter < 8 ; counter++){
mySerial.write(get_readID[counter]);
}
delay(200);
//succeed to read a card ID , return 11 byte data.
if(mySerial.available() == 11){
for(counter = 0; counter < 5 ; counter++) mySerial.read();
cardId = cardId | mySerial.read(); //get byte 1 to cardId
cardId = cardId << 8;
cardId = cardId | mySerial.read(); //get byte 2 to cardId
cardId = cardId << 8;
cardId = cardId | mySerial.read(); //get byte 3 to cardId
cardId = cardId << 8;
cardId = cardId | mySerial.read(); //get byte 4 to cardId
}
mySerial.flush();
}

void setup()
{
Serial.begin(9600);
mySerial.begin(9600);
}

void loop() // run over and over
{
readNumber();
int i;
for(i=0;i<2;i++)
{
if(cardId == customer_ID[i]){
Serial.print(“Customer name :”);
Serial.println(customer_name[i]);
Serial.print(“Card Number :”);
Serial.println(cardId);
firstName = customer_name[i];
}
}
delay(1000);
}

I am trying to assign the customer_name to a variable so that I can use that variable in a if statement
also why should I use a sd card, EEPROM or ram?

Thanks for everyones help!

#8

If only one byte lost you never will get the right 11 bytes.
Check first the startbyte of the datapackage (0xAA) and then read 10 bytes.

#9

You should really study C a bit (or at least read a good book at least once), before shooting yourself in the foot. That’s a really basic question.

Use:
const char* customer_name[]={“Deray”,“Tobe”,“Mike”,“Chris”};
that (simplifying) means that customer_name is an array of constant strings.
But the whole array contents gets copied to RAM at startup…
Once you’ve read about C basics, look for PROGMEM directive in Arduino. This will let you avoid wasting precious RAM by placing those constant strings in program memory.

#10

Thanks and your right!

I have read a book but its been so long since I have had to do anything in C!

I guess i should go over things again!