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Home › Magazines › 2005 › October › Flash Code Lock for PCs

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Flash Code Lock for PCs

Brains instead of brawn

Published in issue 347, October 2005

Flash Code Lock for PCs
This system was designed to eradicate the anarchy that reigned on a school’s computers. Conventional password protection could not be utilized and the old key lock was too easily tampered with and bypassed. Highly objectionable information was being downloaded from the Internet and files being deleted all the time. To no avail, the guilty party was always conveniently dead or in hyperspace! A failsafe physical lock was urgently needed with total control and hence the Flash PC Lock was born!

Components

Free downloads

Resistors:

(all SMD, 5%, case shape 0805)

R1,R2 = 22k

R3,R4,R5 = 1k

Semiconductors:

D1 = 1N4148, SMD, case shape 0805

D2 = zener diode 5.6V 500mW, SMD, MiniMelf case

IC1 = PIC16F628A-I/SO, SO18 case, programmed, Publishers order code 050107-41*

Miscellaneous:

K1 = 9-way sub-D socket (female), straight pins

9-way sub-D connector shell case

PCB, ref. 050107-1 from The PCBShop

Disk, PIC source and hex code files, Publishers order code 050107-11*.

CD-ROM, PC resident software, Publishers order code 050107-81* or free download (approx. 20 MB)

Flash PC Lock Software Guide, free download # 050107-12.zip

* See Elektor SHOP pages

Click below to download a PDF copy of this article from Elektor magazine.

 

Downloads 
PDF Article (U051068.pdf)
10 Elektor Credits
PCB layout (050107-PCB.pdf)
10 Elektor Credits
 

Order from Elektor 
PIC16F628A-I/SO, SO18 case, programmed
050107-41 (USD 8.10)
PCB, bare
050107-1
 

Free downloads 

050107-11.zip

Free download

050107-12.zip

Free download
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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