Vasile,

excellent idea let me think about it.

thanks

Andre
 



-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
Of Vasile Surducan
Sent: Tuesday, January 02, 2007 8:56 PM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] logic component connection limit


Define:

1. "small motors" with voltage, current, type of motor, torque and/or
load at the shaft
2. distance between logic board and driver board, distance between
driver board and motor
3. 2 wires means "left"&"right" or "direction"&"speed" ?

My two cent opinion: forget any parallel approach and do it serially
with a  standardised bus.

Vasile

On 1/2/07, Andre Abelian <aabelian@mason-electric.com> wrote:
>
> Hi to all engineers and happy new year.
>
> I have to drive 128 small motor thru small bridge driver. each motor needs
> 2 wires and I only have 8 pins available. all I have to do is select the motor
> and update the direction. I plane to use 74hc373 that it can latch while
> I am selecting different pair. In this case I am going to need 32 latches
> connected to the PIC 8 pin bus and thru chip select update the status.
> My question is can I connect 32 logic directly to pic port or I
> may need to connect thru buffer.
> sorry I forgot to mention that I have keypad and lcd connected to other ports.
> I am using 18F4520
> any idea or recommendation will appreciate.
>
> Andre
>
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