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From: pcf@galadriel.bt.co.uk (Pete French)
Newsgroups: sci.electronics
Subject: Re: Stepper Motor
Message-ID: <307@galadriel.bt.co.uk>
Date: 3 Aug 89 08:35:00 GMT
References: <2293@ccnysci.UUCP>
Organization: RT6115, BTRL, Martlesham Heath, England
Lines: 30

From article <2293@ccnysci.UUCP>, by sukenick@ccnysci.UUCP (SYG):
>>If you have access to an eprom programmer a really quick solution
> 
>>Step Pulse---| Counter |--------| EPROM   |-------| Drivers |------| Motor |
> 
> My solution:
> Step Pulse---| data flip flop |-------| Drivers |------| Motor |
>  

Or even better...


             A0-3           D0-3
             +--->| Eprom |>---+--------->| Drivers |>------->| Motor |
             |                 |
             |                 |
             |                 |
             +-<| Flip Flop |<-+
                      ^
                      |
  Step pulse ---------+

The advantage is that you can use spare lines on the EPROM to control such
things as direction/full,half stepping. I built such a device that drove 2
3-pole steppers in full or half step mode in either directon totally
independantly of one another.

It also only uses 2 IC's and you dont have to wire up counters.

-Pete French.