Article
RFID Door Opener
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.
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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 the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.
The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.
PCB
Component list
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)
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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