RE:Hi ATM Help : Stepper drive

["Anheier, Norman C Jr" <norm.anheier@pnl.gov>]

Hi Dawie:

A simple approach is to use a 555 timer/oscillator chip and a divide down chip.
There are many examples of this circuit on the net.

A more flexible solution is to use a 82C54 programmable interval timer with an
oscillator clock comprised of the quartz oscillator and a HA7210 low power
crystal oscillator.  Harris makes both these components.   If you start with a 1
MHz oscillator, the timer chip can programmatically divide down the frequency up
to 2E16 to give you very precise timing for your moves.  I built such a system
using 2 interval timers to control both the motor velocity and the number of
steps moved.  It works quite well.  As for the LCD screen question, check out
http://www.seetron.com for Scott's serial LCD controller.

Good luck!
Norm Anheier

>Date: Thu, 3 Sep 1998 22:11:00 GMT2
>From: "Dawie Botes" <DAWIEB@wwg3.uovs.ac.za>
>Subject: ATM Help : Stepper drive
>Hi All>SNIP:

>To solve this problem I have decided to use the computer only to give >directions to the 
>motors through relays. Now I just want to know what >chip I can use to give the motor an 
>accurate step time.>Something I really want to know is: Is it possible to use a 
>>calculators LCD screen with a computer? If so . . . how?