Building a Manual Stepper Controller
Here is the
original circuit presented by Mariss Freimanis on the Yahoo CAD CAM DRO
the original circuit slightly to accept Step In and Direction In inputs
so that you can use the controller in conjunction with other sources of
stepper pulses. For example, you could run the Step/Dir connections from
a CNC breakout card to these inputs and be able to run either CNC or Manual
Here is the
revised schematic (developed with ExpressPCB.com's free software):
Manual Stepper Motor Controller Schematic
This circuit is untested and unsupported. Use at your
own risk. I haven't even built it, and know for a fact there is at least
one error (tying the AND gate outputs together) that would prevent it
to start running forward.
to start running in reverse.
Low: 1M ohm speed control potentiometer.
Wipe + Hi: 1M ohm speed control potentiometer. Tie the wiper to high and
Ground for controller to drive step and direction outputs
Ground to pass Step In to Step Out and Direction In to Direction Out
Step Out: To Gecko
To Gecko Drive.
Parts List (BOM)
Here is what
the board would look like according to ExpressPCB:
Manual Stepper Controller PC Board Layout
their pricing wizard, you could purchase quantities of these boards from
them for the following prices:
||$98.83 = $49.42 per board
||$116.84 = $29.21 per board
||$170.86 = $17.09 per board
|$352.92 = $11.76 per board
As you can
see, there is a significant fixed setup cost, so ordering lots of boards
gets the per-board price to go way down. I've also been told by two different
individuals that it would be easy to lay this board out for single layer,
which would save a lot of costs. I may take a look at that. I can already
see some ways to improve on this layout, and I've also been advised of
some errors which I'm working on fixing.
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