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Wireless Electricity meets RFID

Do-it-yourself wireless RFID sensor systems

Wireless Electricity meets RFID
In this article we describe a do-it-yourself RFID reader as well as a way of making your own RFID tags. What’s more, we show how to make RFID tags that include a transducer, opening up the possibility of making RFID sensors.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Extra info, Update
RFID reader:
- standard microcontroller (ATtiny2313)
- works with EM4102-compatible RFID tags
- output over RS232 interface

DIY and sensor RFID tags:
- standard microcontroller (ATtiny13)
- EM4102 compatible
- analogue and digital inputs for sensors
- status and readings transmitted via RFID ID
- separate adaptor board for programming and debugging

Open source software collection:
- RFID reader firmware
- DIY RFID tag firmware for:
standard RFID tag (fixed ID)
RFID tag with alternating ID
RFID tag with switchable ID
RFID tag with configurable ID
RFID tag with two analogue inputs
RFID tag with temperature sensor
DIY RFID
(PCB # 100051-1)
Resistors
R1 = 1kOhm
R2 = 4.7kOhm
R3 = 330Ohm
Capacitors
C1 = 1.7nF (see text)
C2 = 10µF 25V
C3 = 100µF 25V
Inductor
L1 = 1mH (see text)
Semiconductors
D1–D4 = BAT43
IC1 = ATTiny13-20PU, programmed, Elektor # 100051-41*
Miscellaneous
K1 = 6-way right-angled pinheader
PCB # 100051-1*

Programmer / Debug Adapter
(PCB # 100051-2)
Capacitors
C1 = 100nF
Semiconductors
IC1 = ATTiny13-20PU (for programming / debugging)
Miscellaneous
K1 = 6-pin (2x3) pinheader
K2 = 5-pin right-angled pinheader
K3 = 6-pin right-angled pinheader
PCB # 100051-2*

RFID Reader
(PCB # 100051-3)
Resistors
R1,R2,R3 = 1kOhm
R4 = 2.2kOhm
Capacitors
C1,C3 = 100nF
C2 = 100µF 25V
C4 = 10µF 25V
Semiconductors
D1 = LED, 3mm, red
D2 = 1N4007
IC1 = ATTiny2313-20PU, programmed, Elektor # 100051-42*)
IC2 = 78L05
X1 = 8MHz ceramic resonator
T1 = BS170
Inductor
L1 = 1 mH (see text)
Miscellaneous
K1 = 6-pin (2x3) pinheader
K2 = 9-way sub-D socket, right-angled pins, PCB mount
K3 = 5-way SIL socket
K4 = 5-way SIL socket, right-angled pins
K5 = DC adapter socket, PCB mount, for plug diam. 2.1 mm
RFID module # 080910-91* (SMD stuffed EM4095 board)
PCB # 100051-3*
* Kit of parts, order code 100051-71. Contains RFID module # 080910-91, PCBs # 100051-1, -2 und -3 and programmed microcontrollers # 100051-41 and -42
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