Simple RFID reader
mjordan_14
Posts: 5
Hello
As an employee of radio shack, I have always eyeballed the parallax RFID readers in the parts drawer.. and for $49.99 it wasn't too convincing.
The whole time Ive been employed their, I have never seen anyone purchase one. I don't think there was a store in my district that did, so when i saw them on clearance for $19.99 along with my discount that brought it down to $13 I bought 2 of them.
I also own the Homework board in which i wish to use the readers with.
I'm still relatively new to micro controllers and would appreciate any help.
can anyone write and explain a simple code in which the RFID reader reads a tag and displays or "debugs" the tags number on the screen?
and to extend that, a simple program that puts a pin high to close a relay when and approved tag number is scanned?
thanks for any help.
As an employee of radio shack, I have always eyeballed the parallax RFID readers in the parts drawer.. and for $49.99 it wasn't too convincing.
The whole time Ive been employed their, I have never seen anyone purchase one. I don't think there was a store in my district that did, so when i saw them on clearance for $19.99 along with my discount that brought it down to $13 I bought 2 of them.
I also own the Homework board in which i wish to use the readers with.
I'm still relatively new to micro controllers and would appreciate any help.
can anyone write and explain a simple code in which the RFID reader reads a tag and displays or "debugs" the tags number on the screen?
and to extend that, a simple program that puts a pin high to close a relay when and approved tag number is scanned?
thanks for any help.
Comments
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- Stephen
Here is also the simplest code (found on the previous link) to get the stamp to read tags
' ========================================================================= ' ' File....... RFID_basic.BS2 ' Purpose.... RFID Tag Reader ' Author..... (c) Parallax, Inc. -- All Rights Reserved ' E-mail..... [url=mailto:support@parallax.com]support@parallax.com[/url] ' Started.... ' Updated.... 02 Mar 2005 ' ' {$STAMP BS2} ' {$PBASIC 2.5} ' ' ========================================================================= ' -----[noparse][[/noparse] Program Description ]--------------------------------------------- ' ' Reads tags from a Parallax RFID reader and displays ID to debug screen ' -----[noparse][[/noparse] Revision History ]------------------------------------------------ ' -----[noparse][[/noparse] I/O Definitions ]------------------------------------------------- Enable PIN 0 ' low = reader on RX PIN 1 ' serial from reader ' -----[noparse][[/noparse] Constants ]------------------------------------------------------- #SELECT $STAMP #CASE BS2, BS2E, BS2PE T2400 CON 396 #CASE BS2SX, BS2P T2400 CON 1021 #CASE BS2PX T2400 CON 1646 #ENDSELECT Baud CON T2400 LastTag CON 3 #DEFINE __No_SPRAM = ($STAMP < BS2P) ' does module have SPRAM? ' -----[noparse][[/noparse] Variables ]------------------------------------------------------- #IF __No_SPRAM #THEN buf VAR Byte(10) ' RFID bytes buffer #ELSE Char VAR Byte ' character to test #ENDIF tagNum VAR Nib ' from EEPROM table idx VAR Byte ' tag byte index ' -----[noparse][[/noparse] Initialization ]-------------------------------------------------- Reset: HIGH Enable ' turn of RFID reader ' -----[noparse][[/noparse] Program Code ]---------------------------------------------------- Main: LOW Enable ' activate the reader #IF __No_SPRAM #THEN SERIN RX, T2400, [noparse][[/noparse]WAIT($0A), STR buf\10] ' wait for hdr + ID #ELSE SERIN RX, T2400, [noparse][[/noparse]WAIT($0A), SPSTR 10] #ENDIF HIGH Enable ' deactivate reader Display_Tag: DEBUG "Tag Identification number is: ", CR FOR idx = 0 TO 9 ' scan bytes in tag #IF __No_SPRAM #THEN DEBUG buf(idx) #ELSE GET idx, Char ' read char from SPRAM DEBUG Char #ENDIF NEXT DEBUG CR PAUSE 500 GOTO main ' repeats code▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
If you convince yourself that something is impossible before you even try; you are sure to prove yourself right.
and if you want to add card more than three you need to add or change these item in blue
' ========================================================================= ' ' File....... RFID.BS2 ' Purpose.... RFID Tag Reader / Simple Security System ' Author..... (c) Parallax, Inc. -- All Rights Reserved ' E-mail..... [url=mailto:support@parallax.com]support@parallax.com[/url] ' Started.... ' Updated.... 09 SEPT. 2005 ' ' {$STAMP BS2} ' {$PBASIC 2.5} ' ' ========================================================================= ' -----[noparse][[/noparse] Program Description ]--------------------------------------------- ' ' Reads tags from a Parallax RFID reader and compares to known tags (stored ' in EEPROM table). If tag is found, the program will disable a lock. ' -----[noparse][[/noparse] Revision History ]------------------------------------------------ ' -----[noparse][[/noparse] I/O Definitions ]------------------------------------------------- Enable PIN 0 ' low = reader on RX PIN 1 ' serial from reader Spkr PIN 2 ' speaker output Latch PIN 3 ' lock/latch control ' -----[noparse][[/noparse] Constants ]------------------------------------------------------- #SELECT $STAMP #CASE BS2, BS2E, BS2PE T1200 CON 813 T2400 CON 396 T4800 CON 188 T9600 CON 84 T19K2 CON 32 TMidi CON 12 T38K4 CON 6 #CASE BS2SX, BS2P T1200 CON 2063 T2400 CON 1021 T4800 CON 500 T9600 CON 240 T19K2 CON 110 TMidi CON 60 T38K4 CON 45 #CASE BS2PX T1200 CON 3313 T2400 CON 1646 T4800 CON 813 T9600 CON 396 T19K2 CON 188 TMidi CON 108 T38K4 CON 84 #ENDSELECT SevenBit CON $2000 Inverted CON $4000 Open CON $8000 Baud CON T2400 #SELECT $STAMP #CASE BS2, BS2E TmAdj CON $100 ' x 1.0 (time adjust) FrAdj CON $100 ' x 1.0 (freq adjust) #CASE BS2SX TmAdj CON $280 ' x 2.5 FrAdj CON $066 ' x 0.4 #CASE BS2P TmAdj CON $3C5 ' x 3.77 FrAdj CON $044 ' x 0.265 #CASE BS2PE TmAdj CON $100 ' x 1.0 FrAdj CON $0AA ' x 0.665 #CASE BS2PX TmAdj CON $607 ' x 6.03 FrAdj CON $2A ' x 0.166 #ENDSELECT [color=blue]LastTag CON 3 ' # of card used [/color] #DEFINE __No_SPRAM = ($STAMP < BS2P) ' does module have SPRAM? ' -----[noparse][[/noparse] Variables ]------------------------------------------------------- #IF __No_SPRAM #THEN buf VAR Byte(10) ' RFID bytes buffer #ELSE chkChar VAR Byte ' character to test #ENDIF tagNum VAR Nib ' from EEPROM table idx VAR Byte ' tag byte index [color=blue]'idx VAR Word ' tag Word index if you have more than 10 cards [/color] char VAR Byte ' character from table ' -----[noparse][[/noparse] EEPROM Data ]----------------------------------------------------- Tag1 DATA "0101A625F5" ' valid tags Tag2 DATA "04129C1A1C" Tag3 DATA "041402CCD7" [color=blue]'Tag# DATA "##########"[/color] Name0 DATA "Unauthorized", CR, 0 Name1 DATA "Tag 1 (White Card)", CR, 0 Name2 DATA "Tag 2 (Oval)", CR, 0 Name3 DATA "Tag 3 (Small Round)", CR, 0 [color=blue]Name# Data "Tag # (xxxxxxxxxx) ", CR, 0 [/color]' -----[noparse][[/noparse] Initialization ]-------------------------------------------------- Reset: HIGH Enable ' turn of RFID reader LOW Latch ' lock the door! ' -----[noparse][[/noparse] Program Code ]---------------------------------------------------- Main: LOW Enable ' activate the reader #IF __No_SPRAM #THEN SERIN RX, T2400, [noparse][[/noparse]WAIT($0A), STR buf\10] ' wait for hdr + ID #ELSE SERIN RX, T2400, [noparse][[/noparse]WAIT($0A), SPSTR 10] #ENDIF HIGH Enable ' deactivate reader Check_List: [color=red]DEBUG "TAG ID:", STR buf\10, CR ' Show Tag # [/color] FOR tagNum = 1 TO LastTag ' scan through known tags FOR idx = 0 TO 9 ' scan bytes in tag READ (tagNum - 1 * 10 + idx), char ' get tag data from table #IF __No_SPRAM #THEN IF (char <> buf(idx)) THEN Bad_Char ' compare tag to table #ELSE GET idx, chkChar ' read char from SPRAM IF (char <> chkChar) THEN Bad_Char ' compare to table #ENDIF NEXT GOTO Tag_Found ' all bytes match! Bad_Char: ' try next tag NEXT Bad_Tag: tagNum = 0 GOSUB Show_Name ' print message FREQOUT Spkr, 1000 */ TmAdj, 115 */ FrAdj ' groan PAUSE 1000 GOTO Main Tag_Found: GOSUB Show_Name ' print name HIGH Latch ' remove latch FREQOUT Spkr, 2000 */ TmAdj, 880 */ FrAdj ' beep LOW Latch ' restore latch GOTO Main END ' -----[noparse][[/noparse] Subroutines ]----------------------------------------------------- ' Prints name associated with RFID tag Show_Name: DEBUG DEC tagNum, ": " LOOKUP tagNum, [noparse][[/noparse]Name0, Name1, Name2, Name3, [color=blue]Name#[/color]], idx ' point to first character DO READ idx, char ' read character from name IF (char = 0) THEN EXIT ' if 0, we're done DEBUG char ' otherwise print it idx = idx + 1 ' point to next character LOOP RETURN▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
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Sam
Post Edited (sam_sam_sam) : 4/26/2010 7:12:43 PM GMT