need help finding a motor controller.

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dacflyer
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need help finding a motor controller.

Post by dacflyer » Tue Aug 18, 2015 11:27 am

looking for a motor controller that will not break the bank..
i am looking for a 2ch analog motor controller. seen some but they were over $70.00
i am wanting to build me a small PTZ mount for a camera to use on my plane.
i'll be using small modified servos.
i have the joystick, it is 5Kohms 2 axis the current is very small not even 2amps per motor.
and it will operate off of 12v or less.

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jwax
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Re: need help finding a motor controller.

Post by jwax » Tue Aug 18, 2015 12:45 pm


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Janitor Tzap
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Re: need help finding a motor controller.

Post by Janitor Tzap » Tue Aug 18, 2015 1:18 pm

Hmmm.............

How about getting one of those cheap RC cars from a Dollar store, or Thrift store.
Gut the car for the receiver and the controller.
Image
Or find one of those wired remote cars.
Image


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dacflyer
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Re: need help finding a motor controller.

Post by dacflyer » Tue Aug 18, 2015 7:18 pm

nope,, i need something reversible, and not R/C
i am needing it to be able to work with a dual joystick ( X Y Axis ) center positions being off.

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Re: need help finding a motor controller.

Post by aretallack » Wed Aug 19, 2015 2:41 am

Not sure whether I've understood your requirements properly, but assume you've had a sniff around these sites:
https://www.sparkfun.com/categories/179
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Janitor Tzap
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Re: need help finding a motor controller.

Post by Janitor Tzap » Wed Aug 19, 2015 8:09 am

Okay.....
Hows this sound....

You want the camera to spin around a complete 360 degrees.
Tilt up or down, and control the zoom, and focus.

For the 360 degree, you could use a simple Toggle\Rocker switch.
ImageImage
Forward - OFF - Reverse.
Image
Same for the other functions.
Then put stop/shut off switches at the end of travel of the, spin, tilt, Zoom, and focus mech.
So you don't strip out the gears when it reaches the end.


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dacflyer
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Re: need help finding a motor controller.

Post by dacflyer » Wed Aug 19, 2015 9:42 am

i do not want to use switches, i want variable speed using a joystick..
center position is stop..any direction is moving in that direction, but variable speed,
full swing = full speed, partial movement = slow.
i was looking at something like this, but too cheaper, i only need 1-2 amp ability as
it will be driving very small motors such as in a R/C servo. i'll be using 12v.
can be lower as a regulator is not a problem

https://www.servocity.com/html/roboclaw ... dSwW30YGf4

.
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jwax
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Re: need help finding a motor controller.

Post by jwax » Wed Aug 19, 2015 10:21 am

Big question is, are you trying to drive DC motors, or R/C servos? R/C servos operate on pulses, not DC.
That $70 controller you mentioned will not run servos, only motors.

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dacflyer
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Re: need help finding a motor controller.

Post by dacflyer » Wed Aug 19, 2015 11:07 am

i am going to be using a modified servo...it will be gutted out and only using the motor and gear train.
so it will be a DC motor driven..

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Re: need help finding a motor controller.

Post by jwax » Wed Aug 19, 2015 5:39 pm


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dacflyer
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Re: need help finding a motor controller.

Post by dacflyer » Thu Aug 20, 2015 5:02 am

i looked at this one..but it does not handle analog inputs, only PWM :(

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Re: need help finding a motor controller.

Post by Janitor Tzap » Thu Aug 20, 2015 8:41 am

So basically you want one of these......
Image

I think that the $60 for a unit that is similar to this is a good price.
I've seen others that are in the $100 to as high as the $800 dollar range.
But they can control multiple cameras on a CCTV system.

Yeah, I know.
Building it is half the fun.
Only you may find that building a custom controller may cost more than the one you can get for $60.

Good luck with it.


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dacflyer
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Re: need help finding a motor controller.

Post by dacflyer » Thu Aug 20, 2015 11:24 am

nope,, that is not feasible to have in my plane, and that PTZ controller communicates via serial usually.
i have one of them from Pelco already.

all i need is a small bi-directional, 2 channel motor controller that can be controlled Via. Analog input.
i am looking for in the $30-$40 range.
like i said i want it for use on my Plane.
pterodactyl lumberton airshow.jpg

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Re: need help finding a motor controller.

Post by jwax » Thu Aug 20, 2015 12:51 pm

Now I'm starting to understand!
How about replace the lamp with your motor, and use a smaller MOSFET here? (The BUZ11 is a 30 amp device)
https://www.google.com/url?sa=i&rct=j&q ... 6414884678

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dacflyer
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Re: need help finding a motor controller.

Post by dacflyer » Thu Aug 20, 2015 4:55 pm

i still think you do not understand...

the circuit needs to be variable speed reversible. joystick right makes motor goes 1 way..joystick left makes motor go the other way.
same deal for 2nd motor and joystick up / down.

i think maybe a micro H-Bridge would work if it could have analog input from the joystick POTS ( 5K )
but the joysticks do not have full swing from one end to the other for resistance..

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