About the article

Flash Code Lock for PCs

Brains instead of brawn

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!
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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
(all SMD, 5%, case shape 0805)
R1,R2 = 22k
R3,R4,R5 = 1k
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*
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
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