AVR-Chat

Tim,

Thanks for your input - this is for an Ultra-Low cost robot for use with kids in a club or homeschool environment.  Part of the appeal of this is that the programming cable can be built for less than $5.00.  $30.00 is not a lot of money, but when the 'bot itself with the programming cable is running about $30.00, that would almost double the cost.

The 2313 has enough I/O that it will do the job (introducing kids to computers/control systems/robotics) even if I dedicate those 3 lines to the programming cable exclusively.

Thanks for all of you who helped out with this.

Art

--- In AVR-Chat@yahoogroups.com, "Tim Mitchell" <tim@...> wrote:
>
> ----Original Message----
> From: AVR-Chat@yahoogroups.com
> [mailto:AVR-Chat@yahoogroups.com] On Behalf Of
> andrew.mathison Sent: 07 October 2009 10:40 To:
> AVR-Chat@yahoogroups.com Subject: [AVR-Chat] Re: ISP Port
> Restictions 
> 
> > May I try and warn you that the resistors you are
> > contemplating using, could allow more current than many
> > PPorts can supply....  
> > Please check on the web yourself, but generally speaking,
> > you cannot rely on sourcing more than 2.5ma or sinking
> > more than 24ma. In fact some cannot even sink that much.  
> > 
> > A place to start is here:-
> > http://www.lvr.com/files/ibmlpt.txt
> > 
> > If you are just using a plug in LPT: card in a PC,
> > blowing it is of almost no concern (I would NOT use the
> > mainboard printer port for anything other than a printer
> > as its part of the mainboard chip set nowadays!!) as a
> > cheap replacement will get you up and running again.    
> > 
> 
> Yes, really I would recommend buying the Atmel AVR-ISP which is a USB
> device costing about $30 / 25 euro (depends where you are in the world).
> 
> Saves a lot of messing around and the danger of blowing up your PC.
> 
> -- 
> Tim Mitchell
>