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From: 1 Lucky Texan on 22 May 2010 16:49
On May 4, 3:01 pm, FJG <f...(a)invalid.invalid> wrote:
> As a coder I've usually had custom hardware to work with and
> the choice of architecture etc has been cost-driven and set
> in stone long before I start trying to debug the board...
> but I digress.
>
> I have a potential project coming up, where I may have
> some influence on the hardware.  The spec is of necessity
> still slightly woolly, so my apologies for that in advance.
>
> The basics are
> input - RFID tags, info probably read over RS-232
> output - solenoids / relays to turn a motor on
> I/O - USB memory stick to upload new settings, download reports
> control panel - three buttons and possibly a cheap LCD display
> optional - WiFi interface
> weatherproofed - will operate outdoors, off 12V DC
>
> ROM / RAM / CPU requirements are going to be modest by today's
> standards.  We're talking about, say, 200 RFID tags to recognise,
> each of which has an individual setting for the amount of time
> to turn the relay / solenoid on for.
>
> So any suggestions for a single board microcontroller that'd
> provide the above at reasonable cost, with the minimum of hassle,
> with a (preferably free) C toolchain?
>
> Personally I think the idea of a USB port on an outdoor piece
> of equipment is a bit nuts, so any suggested alternatives?
> Bluetooth?

check this rfid 'toy' interface;

http://vimeo.com/6698128
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