i have managed to generate a clock pulse in one of the pins of the
microcontroller.(i have only one pin left free for myy use!!!)
now i need to give this clock pulse to 2 of my stepper motors.(the
clock pulse is given to the stpper motor controller)
is it fine if i give the same clock from this one pin to both of
them....

freeze wrote:
> i have managed to generate a clock pulse in one of the pins of the
> microcontroller.(i have only one pin left free for myy use!!!)
> now i need to give this clock pulse to 2 of my stepper motors.(the
> clock pulse is given to the stpper motor controller)
> is it fine if i give the same clock from this one pin to both of
> them....
You mean what to isolate them with a unity gain stage or maybe a
resistor branch.


--
"I'd rather have a bottle in front of me than a frontal lobotomy"

http://webpages.charter.net/jamie_5"

Jamie wrote:

> freeze wrote:
>
>> i have managed to generate a clock pulse in one of the pins of the
>> microcontroller.(i have only one pin left free for myy use!!!)
>> now i need to give this clock pulse to 2 of my stepper motors.(the
>> clock pulse is given to the stpper motor controller)
>> is it fine if i give the same clock from this one pin to both of
>> them....
>
> You mean what to isolate them with a unity gain stage or maybe a
> resistor branch.
>
>
I don't know where the hell my mind was when I posted that.
it should read as..
You may want..................


--

http://webpages.charter.net/jamie_5"

On Jan 20, 6:06=A0am, freeze <amithbn...@gmail.com> wrote:
> i have managed to generate a clock pulse in one of the pins of the
> microcontroller.(i have only one pin left free for myy use!!!)
> now i need to give this clock pulse to 2 of my stepper motors.(the
> clock pulse is given to the stpper motor controller)
> is it fine if i give the same clock from this one pin to both of
> them....

That's what specs are good for. Not having given the stepper
controller make and model, or the microcontroller, you're really on
your own.

First off, take a look at the microcontroller specs, and see how much
current your output pin can source *and* sink (both or either may be
important). Most microcontroller output pins can source and sink at
least as much as an HCXX output pin (that's +/- 4mA). But many can
source/sink more (some can do up to +/-20mA). Some less.

Now take a look at the specs on your stepper driver. Optoisolated
ones may require as much as 20mA each (source or sink, only active one
way). Some stepper drivers have protected logic gate inputs, which
don't require any DC current. Many more have logic gates with pullup
resistors to an internal (or external) supply. Many use a 10K or 4.7K
pullup to +5V, which means 0.5mA or 1mA each, within the drive
capability of all microcontrollers.

YMMV, so the first rule is, Read The Fine Manual.

Cheers
Chris