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Being a software guy and control freak I try to do everything in code and minimise the hardware and hard-wiring of functions. Plus in the particular case of the Super Polaris I'm reluctant to make any physical changes to such a classic mount.
The original reason I built the controller was that I thought I had fried my original one with reversed voltage. (The original connector had +ve on the outside!) As it was it is ok. But I took one look inside and decided it would be easier to build on an Arduino. It didn't take long to realise I could then design it for pulse guiding.
The only physical change I've mad was to reverse the connector inside the hand controller to the more usual +ve inside and add a 9V regulator so I can power it from a 12V supply. It possible I could run off 12V and get more torque but the original used a 9V battery pack and I didn't want to risk damaging anything without having access to the full specs for the motors.
I like the design of the PCB. It's not something I've ever attempted.
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