@John Ryan: In the past I've tried to modify the parallax rfid code for weeks in a row without any succes (see my other forum post: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1186246253/15).
After this I finally succeeded in printing the the tag codes to serial monitor by modifying some other code I found on the web. But with this last code (the code I posted at the beginning of this topic) I noticed that by changing the variable "serInString" from char to byte the output was always smaller and more equal in length rather than being always different from tag to tag. This is the output for 3 tags using a "char" variable:
00FFFFFFDDFFFFFF8EFFFFFF96E014FFFFFFE010FFFFFFC8
00FFFFFF989FFFFFF96E014FFFFFFE0FFFFFF857B
001B4EFFFFFFC1D014FFFFFFE0FFFFFFD57B
This is the output for the same 3 tags using a "byte" variable:
00DD8E96E014E010C8
0098996E014E0857B
001B4EC1D014E0D57B
These are all printed with the command "Serial.print((serInString[serOutIndx]), HEX );"
I mention all this because maybe the whole problem of comparing the tags to a list is related to this. I've also spotted in the basic stamp code that the tags are in this format
'Valid tags
Tag1 DATA $00, $00, $7B, $7D, $90, $F2, $36, $07, $07, $F2, $03, $7D
Tag2 DATA $00, $00, $7D, $7D, $1E, $1F, $E0, $E6, $EF, $6E, $04, $04
Thus being 12 hex numbers while I only have 9 in two tags and even one tag (0098996E014E0857B) with 17 character that I even can't split into HEX (if you know what I mean)
@brianbr: I've tried the "strcmp" command but with no succes, the led flashes, but only when wrong tags a presented. Maybe it's related to the problems described above.
Does anyone see any light in this mess? :-/ Any help is really appreciated.
Kind Regards, Loic