how do I connect unipolar stepper (858) using h-bridge without using shield?

by kelp on Wed Nov 28, 2012 5:37 pm

is this possible ?

https://www.adafruit.com/product/858

I've been reading that it should use darlington array instead (not like I know what that is yet -noob here), but since the adafruit motor shield has h-bridge, I thought there might be a way.

I think these are correct for wire color indications

Coil #1 -- PINK  & ORANGE 
Coil #2 -- BLUE & YELLOW
Center Tap -- RED

if it is possible, can someone match those to the L293D assignments ?

thanks.
kelp
 
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Re: how do I connect unipolar stepper (858) using h-bridge without using shield?

by adafruit_support_bill on Thu Nov 29, 2012 6:12 am

You can use either a H-bridge like the L293D or a darlington array like the LN2803
Here is a nice tutorial showing how to connect the L293D. It uses the Stepper library that comes with the IDE: http://www.arduino.cc/en/Tutorial/Stepper
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Re: how do I connect unipolar stepper (858) using h-bridge without using shield?

by kelp on Thu Nov 29, 2012 10:16 am

thanks for replying.

i did want to use the arduino.cc tutorial.

i have my board setup like the bipolar layout, because i have a L293D, but then i realized that the diagram is not for a unipolar stepper, and i couldn't find any 5-wire diagrams or advice anywhere.

do the coil wire sets go to all the 'out' pins as in the 'bipolar' diagram, and then where does the center tap, red attach ?
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Re: how do I connect unipolar stepper (858) using h-bridge without using shield?

by adafruit_support_bill on Thu Nov 29, 2012 10:37 am

That is weird. That is a redirect from the tutorial link which showed both wiring diagrams. The original link is gone now.

There is this one: http://www.arduino.cc/en/Tutorial/StepperUnipolar
No wiring diagram, but follow the comments. The center-tap goes to the positive terminal of your power supply. The other wires to the outputs of your bridge.
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Re: how do I connect unipolar stepper (858) using h-bridge without using shield?

by kelp on Thu Nov 29, 2012 11:01 am

great, thanks so much.
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