About the article

RFID Door Opener

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.
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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 its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R2 = 2MO (or 2MO2)
R3 = 68k
R4, R5 = 1k
C1*,C4 = 33nF
C2 = 10nF
C3 = 47nF
C5 = 100µF 25V
D2,D3 = 1N4003
T1,T2 = BC546*
IC1 = SF6107 (www.sfchip.de)
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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