Step 1: Connecting the RFID module to Arduino: Setting up the hardware is very easy, just plug the XBee shield with the RFID module to Arduino. The jumpers in the XBee shield have to e set to XB!! position. "ow you #an program the Arduino and #ommuni#ate it with the RFID module using the serial port $Serial.read$%, Serial.print$%...%. Step 2: Reading EM4100 cards read onl! cards": In this part we show an e&le o' the Arduino reading !()*++ #ards. e use the Auto Read mode. Arduino is waiting all the time, when a #ard is dete#ted, we read its #ode, lin- the Arduino !D and print the #ode over /SB port. Command 0x87 - Set Auto Mode: EM4102 Mode - Parity decoded - Manchester RF/4 FF 01 0! 87 01 0" 02 00 10 20 "0 40 "7 Arduino code: /* * RFID module from Libelium for Arduino * Basic program, just Read EM!!! cards * * "op#rig$t %"& '!!( Libelium "omunicaciones Distribuidas )L
* $ttp+// libelium com * * -$is program is free soft are+ #ou can redistribute it and/or modif# * it under t$e terms of t$e . 0 .eneral 1ublic License as publis$ed b# * t$e Free )oft are Foundation, eit$er 2ersion 3 of t$e License, or
* %at #our option& an# later 2ersion * * -$is program is distributed in t$e $ope t$at it ill be useful, * but 4I-560- A 7 4ARRA -78 it$out e2en t$e implied arrant# of * MER"5A -ABILI-7 or FI- E)) F6R A 1AR-I"0LAR 10R16)E )ee t$e * . 0 .eneral 1ublic License for more details * * 7ou s$ould $a2e recei2ed a cop# of t$e . 0 .eneral 1ublic License * along it$ t$is program If not, see 9$ttp+// gnu org/licenses/: * * ;ersion !
* Aut$or+ Marcos 7ar<a */
// 2ar int led = 38 b#te data> = !?!!8 b#te data>' = !?!!8 b#te data>3 = !?!!8 b#te data>@ = !?!!8 b#te data> = !?!!8 int 2al = !8
2oid setup%& // )tart serial port C'!! bps )erial begin% C'!!&8
pinMode%led, 60-10-&8 dela#% !!&8
// )etting Auto Read Mode EM@ !' Decoded Mode o pass ord // command+ FF ! !C ( ! !3 !' !! ! '! 3! @! 3 )erial print%!?FF,B7-E&8
)erial read%&8 // e read ! )erial read%&8 // e read ! )erial read%&8 // e read ! data> = )erial read%&8 // e read data data>' = )erial read%&8 // e read data ' data>3 = )erial read%&8 // e read data 3 data>@ = )erial read%&8 // e read data @ data> = )erial read%&8 // e read data )erial read%&8 // e read c$ecJsum
// Led blinJ
for%int i = !8i9@8iKK& digital4rite%led,5I.5&8 dela#% !!&8 digital4rite%led,L64&8 dela#% !!&8 G
// 1rinting t$e code of t$e card )erial println%&8 )erial print% EM@ !! card found "ode+ &8 riteB#te%data> &8
The ne&t e&le o' use o' the RFID module is the reading o' T1112 rewrita le #ards using Arduino.
Command
0x87 - Set Auto Mode: #yte trac$ %ode - Parity decoded - Manchester RF/ 4& 7 '(oc$s& )ithout *ass)ord+
FF 01 0! 87 01 01 07 00 10 20 "0 40 "A
Arduino code: /* * RFID module from Libelium for Arduino * Basic program, just Read - %re ritable& cards * * "op#rig$t %"& '!!( Libelium "omunicaciones Distribuidas ) L * $ttp+// libelium com *
* -$is program is free soft are+ #ou can redistribute it and/or modif# * it under t$e terms of t$e . 0 .eneral 1ublic License as publis$ed b# * t$e Free )oft are Foundation, eit$er 2ersion 3 of t$e License, or * %at #our option& an# later 2ersion * * -$is program is distributed in t$e $ope t$at it ill be useful, * but 4I-560- A 7 4ARRA -78 it$out e2en t$e implied arrant# of * MER"5A -ABILI-7 or FI- E)) F6R A 1AR-I"0LAR 10R16)E )ee t$e * . 0 .eneral 1ublic License for more details * * 7ou s$ould $a2e recei2ed a cop# of t$e . 0 .eneral 1ublic License
* along it$ t$is program If not, see 9$ttp+// gnu org/licenses/: * * ;ersion ! * Aut$or+ Marcos 7ar<a */
The ne&t e&le 'or this module is the writing8reading o' RFID #ards. e program an Arduino oard to read aT1112 #ard, then Arduino writes lo#-s 4, 6, ), 1 and 7 o' the #ard with an in#remental value ea#h time.
)arning*** =n#e password is ena led, i' the lo#- 2 data is un-nown then it is impossi le to a##ess the #ard again unlesswith the #orre#t ) yte password.For a#tivating the password, we>ll program the lo#- +, we have to e #are'ul programming this lo#- otherwisethe tag may not e a##essed again.
Acti ate pass(ord in the card First o' all, we have to dis#over the password $) ytes%, so we have to read the lo#- 2 in the #ard $see the a ovee&le%.
Password for our card:
00 00 00 00
=n#e we -now the password o' the #ard we #an a#tivate it using this #ommand
Command for activating the password in the card
FF 01 0A 2" 00 00 14 80 F0 .;E.<S=M
> Pass)ord
)riting data in a protected cardFor writing data using password we>ll use #ommand +&46
#?6.<: #(oc$ to )rite 0x02& 0x0"&0x04& 0x03& 0x0 or 0x075
9A,A0& 9A,A1& 9A,A2& 9A,A": 9ata 'ytes to store 4 'ytes5
: Pass)ord 4 'ytes5
Reading data in a protected card
For reading data in a prote#ted #ard, we>ll use #ommand +&*6Read with pass command
FF 01 07 1" 01 #?6.<S .;E.<S=M
#?6.<S: #(oc$s to read 1-75
: Pas)ord
e also #ould use Auto read mode%
Deacti ate pass(ord in the card?ust sending this #ommand you #an dea#tivate the password in the #ard.
FF 01 0A 2" 00 00 14 80 E0 .;E.<S=M
> Pass)ord
Step : 3sing the sleep mode:
An advantage o' our RFID module is that it has got a sleep mode that let us save power hen we don>t use it. @o tothe sleep mode is very easy, just sending a #ommand. hen the RFID is in sleeping mode and we want to wa-eup it we need to provide it a 0I@0 $1 % pulse to the reset pin. e>ll use one o' the Arduino outputs to #ontrol thereset signal. For ma-ing the #onne#tion we>ll use a #a le 'rom output 5 to RST pin in the XBee shield $loo-pi#ture%.
* . 0 .eneral 1ublic License for more details * * 7ou s$ould $a2e recei2ed a cop# of t$e . 0 .eneral 1ublic License * along it$ t$is program If not, see 9$ttp+// gnu org/licenses/: *
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