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INDI Library v2.0.6 is Released (02 Feb 2024)

Bi-monthly release with minor bug fixes and improvements

DIY focuser w/o Motor HAT or PiFace?

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Are you sure it is a 5v stepper, and not 12v?
6 years 6 months ago #19191

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On the Amazon page it says "nominal voltage: 3.45 V, nominal current: 1.5A (monophase)".
6 years 6 months ago #19192

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Ok. But 1.5A exceeds the 1A the a4988 is designed for. In any case you would need to check the Vref pin - but pls check the pololu Instructions first...
6 years 6 months ago #19193

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6 years 6 months ago #19194

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Forgot to mention, there are loads of instructions on YouTube on how to convert the 28byj48 into a bipolar stepper - it is actually fairly easy to do.

Best, Helge
6 years 6 months ago #19195

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I DID IT!!!! I took the risk and increased the voltage to 12 V, and not it works! I have no idea why it says 3.45V on Amazon, must be a typo!!
6 years 6 months ago #19196

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Fantastic, well done! - then current will presumably be lower than the 1.5A. Can you check what current is drawn?

I was also running a 5v stepper at 12v. Unless it is getting warm, should be ok - but I am not an electrician (=disclaimer).
6 years 6 months ago #19197

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That's what I thought after I saw your pictures ;-)
I'm glad you got it working!
6 years 6 months ago #19198

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Is there a way to have INDI calculate the necessary number of steps for backlash compensation? Or should I determine it by hand?
6 years 6 months ago #19250

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The driver does not calculate backlash value. You need to determine it manually
6 years 6 months ago #19252

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Any tips on what would be the best way to determine the number of backlash steps?
6 years 6 months ago #19301

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Just observe the focuser tube while travelling by small amount of steps.
6 years 6 months ago #19309

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