New Stepper control for Focuser

[2stroke (Jay)]

Mine does run as great, if i turn the encoder to fast it doesn't move though it seems to register as leds flash quickly. Would this be because ive used only 1 1k resister for each double out, so theres a total of 3 instead of 6? Like pins 5 and 1 meet then go through a single 1k then onto leg A of the encoder? Lol maybe cause mine looks neater then kens wiring job, or the altronics encoders are poor quailty http://www.altronics.com.au/index.as...=item&id=S3350

[bojan]

This is because you reached the stepper motor max speed.
Higher voltage will help.. but not much.

[MrB (Simon)]

I wonder if it's the start speed and not the max speed?
The encoder is only 20 pulse per rev. If it is one step per encoder pulse, even spinning it fast would not be many rpm for the motor.
Try ramping the speed up by starting slow on the encoder then increasing.
I'm guessing you are exceeding the motor's pull-in torque capability from a dead start?
This would also be helped by a higher voltage.

[Nico13 (Ken)]

Originally Posted by 2stroke

Mine does run as great, if i turn the encoder to fast it doesn't move though it seems to register as leds flash quickly. Would this be because ive used only 1 1k resister for each double out, so theres a total of 3 instead of 6? Like pins 5 and 1 meet then go through a single 1k then onto leg A of the encoder? Lol maybe cause mine looks neater then kens wiring job, or the altronics encoders are poor quailty http://www.altronics.com.au/index.as...=item&id=S3350

LOL hey whats wrong with my wiring job it's the best mess I could make and it still worked ok, I was just following Bojans mud map Thanks Bojan it wouldn't have worked without your help

Version two will be a lot neater. (I hope)

Mine does the same if you spin it quick but that's ok for this job I guess.

[2stroke (Jay)]

Cheers guys lol i think ill play it safe just using a computer psu and i don't think that 5v 12v rail to make a 7v rail would be safe haha. Thanks for the schematics Bojan, well written and worked a treat, just wish i had some bread board though haha. Really need a sticky in this section with links to schematics and projects because god knows how many useful things are lost in the thousands of threads
I did mine in pretty yellow and black ken with shrink over connections. I still think your test version runs better, time to ghetto mine up hahaha.

[bojan]

Old thread, but updated design..
I added one IC (4001) to change the Full-step drive sequence with Wave-Drive.. resulting in 1/2 power consumption.

I am using older stepper driver on 2 of my telescopes for focusing - 10" Newt and Canon FD 400mm f/2.8.
I will make contrpoller with new design for C11.

[bojan]

And, it is worth mentioning commercial version of similar (but wireless) stepper driver on BangGood.