RFID Door Opener
Published in issue 379, July/August 2008
The RFID-based project described here employs a specially-programmed IC from the ‘SFChip’ (the ‘SF’ stands for ‘Special Function’) product family. The SF6107 is an IC designed to work as an RFID receiver for tags that operate on a nominal frequency of 125 kHz. Tags (or, more properly, ‘transponder cards’) compatible with the EM4102 contain forty bits of data and are available for a pound or two each.
Resistors
R2 = 2MO (or 2MO2)
R3 = 68k
R4, R5 = 1k
Capacitors
C1*,C4 = 33nF
C2 = 10nF
C3 = 47nF
C5 = 100µF 25V
Semiconductors
D2,D3 = 1N4003
T1,T2 = BC546*
IC1 = SF6107 (www.sfchip.de)
Miscellaneous
J1 = 2-way pinheader with jumper
BZ1 = piezo buzzer
K2,K3 = 3-way PCB terminal block, lead pitch 5mm
Re1 = relay, 5V, type V23057*
L1 = 100 µH inductor (30 turns 0.5mm ECW, 55mm diameter*
PCB, # 071154-1 from Elektor SHOP or www.thepcbhop.com)
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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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