e-Key Secure Access System
Based on iButton™ ICs
Materials
Gerber file
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Component list
R1 = 5k 6
R2,R4,R6,R8 = 10k
R3,R7,R9,R10 = 1k
R5 = 100k
Capacitors:
C1 = 100µF 25V radial
C2,C3,C7 = 100nF
C4 = 10µF 10V radial
C5,C6 = 22pF
Semiconductors:
D1 = 1N4001
D2,D4,D5 = LED
D3,D6,D7 = 1N4148
T1 = BC547
T2,T3 = BC557
IC1 = 7805
IC2 = AT90S1200 (programmed, order code 000089-41)
Miscellaneous:
K1 = 2-way PCB terminal block, raster 5mm)
X1 = 4MHz quartz crystal
RE1,RE2 = PCB mount relay, 6 V, 1 changeover contact, e.g., V23057-B0001-A101 (Siemens)
K3 = 9-way sub-D socket (female), PCB mount
K4,K5 = 3-way PCB terminal block, raster 7.5mm)
Keys = Serial Number iButton™ DS1990A (Dallas Semiconductor, RS Components, Farnell # 790-461)
Optional: key support DS9093A
Contact Reader for iButton™ DS9092 (RS Components, Farnell # 790-473)
PCB, order code 000089-1
Optional: project source code files on disk, order code 000089-11.
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