Author Topic: stepper motors  (Read 995 times)

dave-in-NJ

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stepper motors
« on: July 06, 2013, 07:43:07 AM »
In reading the archives, it appears that the first stepper driver was 4 transistors that would be turned on, one at a time in sequence. 

I have zero experience with the arduino and am hoping your program is able to help me.  I will be using light sensors as the basis to track the sun.

My hope is to use the arduino mini as the control for a stepper motor using the 4 transistors to control the steps.

As I see the need, it only needs to pulse to allow the motor to move, then remove any signal until the next pulse.   I am hoping the screw drive will be sufficient to hold the unit in place when there is no power supplied.

What I am hoping to get is a simple program that will see a signal on one pin, then output the pulses to the stepper.
then see a signal on a second pin and output to a different stepper. 

also, is there any way to use only the 4 pins to drive the stepper and then two other pins to select which motor ?

Since I really do not know here to start, please let me know if I asked the right questions.




Gabriel

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Re: stepper motors
« Reply #1 on: July 09, 2013, 09:31:58 AM »
Are you tracking the sun, or are you building a heliostat? I seem to remember you asking about heliostats earlier, so I will assume that's what you are doing.

I would forget about using the 4 transistor method for controlling stepper motors and instead just buy a regular driver board like the EasyDriver. It's a lot easier to just buy the pre built package, trust me. That's what I should have done in the first place myself.

If you want to use light sensors to track the sun then the program I wrote probably won't be any help at all. You would basically have to start from scratch.

I've never tried to build a heliostat that uses light sensors myself, so I don't think I can be of any help there. I have come across a few links that might help though.
http://www.heliotrack.com/TheHeliostat.html

http://www.foundry.ray-vin.com/fusion/fusionstory.htm

http://www.heliostat.us/

These all use light sensors to aim the heliostat. If understand correctly, they don't bother to track the sun. They essentially just track the reflection.