RE: [CAD_CAM_EDM_DRO] unipolar stepper and 5804

Very first – thanks for ALL the help!

Wow – I thought I “broke” the list with my last post – no activity for
nearly 20 hours!

First – thanks for the programmer links, am looking into them, as well as
trying to track down a MicroChip one.

Second – we’ve got the 5804 circuit wired up and also a 555 circuit wired up
and tested with a flashing LED. Might have to speed up the times a bit, but
I think we can handle that. I’m taking an oscilloscope to school today to
let the kids look at the waveform, and it occurred to me that we might need
to be careful of the waveform. Is that true, or do we just need a “pretty
straight “ edge attached to the step pin (pin 11) of the 5804? And we drop
off the current limiting R to the LED, and just run pin 3 of the 555
directly to pin the step pin of the 5804.

>>We have some salvaged unipolar (5 wire) steppers that we’ve made move with

David Benson’s 4 SPST, 4 diode manual unipolar tester. His next step was to
build a board with either a PIC16C711 or PIC1F84 supplying phase, direction
and full or ½ step info plus the step input (3 microsecond minimum timing)
to a UCN5804 translator/driver. We thought we had access to a PIC
programmer that would program the 84, but alas we do not. SO I’m wondering
if we can just have switches to the phase (pin 9), ½ step (pin 10) and
direction (pin 14) to control those items and dump a square wave from like a
555 to “step” (pin 11) to get the 5804 to “Control” the stepper.

thanks

Chuck Merja
<http://www.srvscien <http://www.srvscience.org> ce.org> www.srvscience.org

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