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I finally got a breadboard onstep going using a Teensy 3.2 - seems to work with the android app. The other week I got an old EQ5 mount - it already had stepper motors mounted.
So the last thing to do is to put it on a proper PCB. Even better news I found a website that makes PCBs for ~ $0.50 each. Plus about $16 delivery - well its still cheap. <easyeda.com>
The other thing is that a pile of DIYers put their PCB designs on the website that you can use modify and get made by them. There's a few onstep designs there, including the miniPCB by Howard Dutton, plus some nice designs by others. Ordered 4 miniPCBs last week and they are now on their way!
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