Author Topic: stepper motors  (Read 1021 times)


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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.


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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.

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.