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Old 04-09-2018, 03:30 PM
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Tony Leece
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question on diy motor drive electronics?

Hi, i currently own an undriven eq5 mount and until i can save for something decent i thought i would try to motorise it.
i was given a hand contoller that was part of an RA kit for the eq5.
I was looking to buy a cheap but fairly powerful stepper motor and use this controller with it.
My electronics experience is lets say minimal My question is are they compatable straight off, or do i need other electronic components to use this setup?
gears and the like i am ok with, its just electronics
Please keep any answers simple for me, jargon don't compute
I hope the pics help as i wasn't sure what to take pics of
Cheers folks

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Old 04-09-2018, 03:32 PM
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Merlin66 (Ken)
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Tony,
I'm sorry to say that controller won't help you much.....
It's actually a 9V DC hand controller for the SW focuser motor.
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Old 04-09-2018, 03:37 PM
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these are the wires from the stepper motor
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and these from the controller
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note; i haven't yet bought the stepper motor just in case
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Old 04-09-2018, 03:44 PM
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Merlin66 (Ken)
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Tony,
Completely different technology....
The four wires from the SW controller are only used to make use of the RJ9 plug and socket....
The red/black and green/ yellow actual joint together to make the + and - DC connections at the SW motor.
You need to think about a stepper motor driver board; I'm sure there are others who have built such drives....
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Old 04-09-2018, 03:46 PM
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Merlin66 (Ken)
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Hmmm
Looking at that box it really could be anything, only looking at the internal PCB would possible give a clue.
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Old 04-09-2018, 03:47 PM
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Thanks Ken, i feel a bit daft now for posting those images
Back to the drawing board
Cheers mate
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Old 05-09-2018, 04:35 PM
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A plan view of the PCB should be helpful.
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Old 06-09-2018, 11:14 AM
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... and a multimeter to identify the pairs of wires for each winding of the stepper motor. 4 wires implies it has 2 coils without centre taps (which corresponds to a 6 wire stepper).
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Old 06-09-2018, 11:50 AM
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For the stepper - the standard is red/blue for one coil and black/green for the other. And you have to get the polarity right for each coil - you'll soon know if its wrong.
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