dongle architecture

hi all, i would like to develop a dongle for pda as my school project, can anybody give me some information about that? if somebody can help, please let me know. Thank you very much in advance!

Here's one place..

On Wed, 24 Sep 2003 21:34:17 -0700, "Richard Crowley" Gave us:

Doh! It doesn't explain construction. Duh!

Dongles basically consist of some active circuitry that returns some code when given an activation sequence. The activation sequence can be a combination of characters and control lead changes. You will find this type of dongle more difficult on a Palm PDA, as they have limited serial control leads. Sophisticated dongles can include real-time clocks that must be reset with a new code every year (or whatever) to keep the associated software running.

Which PDA? Different devices have different interface capability.

Will your device require power? If so, will it be self-contained or drain the batteries of the PDA?

A dongle could be as simple as a CMOS timer, counter, and some gates, powered by the serial leads. A sequence of X high->low changes on a control lead in a specified time period could generate a character back on the RD lead.

A PIC could incorporate all the functionality needed, possibly at the expense of shorter battery life.

More about me:

VB3/VB6/NSBasic Palm/C/PowerBasic source code: Drivers for Pablo graphics tablet and JamCam cameras: johnecarter at@at mindspring dot.dot com. Fix the obvious to reply by email.

On Thu, 25 Sep 2003 15:29:49 GMT, the Wiz Gave us:

Not all dongle are serial devices. In fact, parallel is the most common.

when

combination of

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with a new

When talking about serial or parallel then it should be "more" not "most".

That gets me a point back for "weird" :)

On Fri, 26 Sep 2003 10:36:34 +0100, "Mjolinor" Gave us:

Actually the claim is for most often used, not "serial or parallel".

"Most common" sounds better to me than "more common", and neither is incorrect. So.... nevermind... I won't say it.

new

True, but in the specific example of a Palm PDA, it's about the only choice.

USB devices are also available.

More about me:

VB3/VB6/NSBasic Palm/C/PowerBasic source code: Drivers for Pablo graphics tablet and JamCam cameras: johnecarter at@at mindspring dot.dot com. Fix the obvious to reply by email.

On Mon, 29 Sep 2003 01:16:56 GMT, the Wiz Gave us:

new

Good point. Maybe BlueTooth, and Wi-Fi models too, eh? Then, a corporation could buy one addressable dongle that carries all the licenses for the entire firm. Talk about upgrade ease!

Whereas On Sun, 28 Sep 2003 18:39:31 -0700, DarkMatter scribbled: , I thus relpy:

when

of

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And multi-seat piracy, one thing dongles were used to combat.

--
Gary J. Tait .  Email is at yahoo.com ; ID:classicsat

On Mon, 29 Sep 2003 14:56:07 -0400, Gary Tait Gave us:

Dipshit. If it were designed to be a multi-seat validation device, it would function as such.

Your remark is about as retarded as it gets.

You must be one of those lame dips that goes around stealing loose WLAN connections. Sorry, dingbat, this schema would not be vulnerable to such adolescent twits.

Try again.

And multi-seat dongles do exist anyway.

On Tue, 30 Sep 2003 11:38:27 +0800, Dave Baker Gave us:

Doh! Since I used to make them, I think I am up to date.

Are they the type I suggested? Blue tooth or other wireless technology?

That is why I was agreeing with you.