You could probably hack something like this together using an L293 which is 
good for 1.5 amps, or the L298 which is good for 2.5 amps.

Take a look at an appnote here

http://www.powerdesigners.com/InfoWeb/design_center/Appnotes_Archive/1680.pdf

I suspect you can keep your parts cost around $10, especially if you can 
talk someone out of a free sample.

--Lawrence Lile
Electronic Solutions
Project solutions Engineering




>From: "liam ." <liaaam2@gmail.com>
>Reply-To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>To: piclist@mit.edu
>Subject: I2C Stepper Motor Controller
>Date: Tue, 22 Feb 2005 16:25:55 +1030
>
>I'm still planning an idea for a project I want to build but at the
>moment the concept will need an I2C controlled Stepper Motor
>Controller.
>
>Do these exist in a simple package?
>
>I've come accorss some avaliable for great expense $80 or more which
>include microcontrollers and H-bridges, pre constructed on a PCB with
>surface mount but Im not after this.
>
>I only want to drive a small stepper so a couple of Amp would be
>plenty of room. I am happy to have to build my own H-Bridge or use a
>seperate H-Bridge chip.
>
>Cost approx ~$10 ?? Am I to hopefull??
>
>Any ideas ???
>--
>http://www.piclist.com PIC/SX FAQ & list archive
>View/change your membership options at
>http://mailman.mit.edu/mailman/listinfo/piclist

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