Re: Help with PIC selection
From: James Lerch (jlerch_at_no.spam.tampabay.rr.com)
Date: 02/22/05
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Date: Tue, 22 Feb 2005 17:39:09 GMT
On Mon, 21 Feb 2005 21:30:09 -0500, Active8 <reply2group@ndbbm.net>
wrote:
>On Mon, 21 Feb 2005 20:18:43 GMT, James Lerch wrote:
>
>You mentioned needing 24 outs for the steppers and though I'll not
>try to talk you out of playing with big PICs, you don't need that
>much. You can use 2 line stepper controllers (direction/step) and
>demux and latch them to the steppers or even use 4 PIC lines (store
>each stepper's last state so you can multitask them when more than
>one input is active) and some address lines to demux the control
>sigs.
I could go this route, and actually gave it some thought, but decided
against it. Since this is going to be a one off hobby board, and I
won't be etching a circuit, but using three hole per trace "universal
Dip Bread boards" I'm leaning towards keeping the part count (and
their corresponding jumper wires} to a minimum.
So in this case the big hammer and Kiss principal seem most
appropriate, IMO :)
While I still have soo much to learn about PICs, I'm hoping to keep
the part count down to as few components as necessary. For instance,
I'm hoping to use only
1x 7805
1x Pic
12x Mos-Fets
4x momentary push buttons
2x SPST toggle switches
1x reostat
And of course some caps, resistors, cable connections as needed..
Well, that's what my naive brain is telling me at the moment.
I'm currently researching HOW-TO move the code to the PIC, and of
coarse how to write the code to program the PIC with in the first
place. ;)
Of course, it would be real nice if I could update the PIC in circuit,
and even nicer to be able to watch what's going on from the PIC in
real time on a PC, and even better would be the ability to make the PC
- PIC connection myself via either a Serial or Parallel port.
Currently I just don't know enough to know what is feasible and what
isn't, but I'm sure the information is out there somewhere just
waiting for me to read it :)
Take Care,
James Lerch
http://lerch.no-ip.com/atm (My telescope construction, Testing, and Coating site)
Press on: nothing in the world can take the place of perseverance.
Talent will not; nothing is more common than unsuccessful men with talent.
Genius will not; unrewarded genius is almost a proverb.
Education will not; the world is full of educated derelicts.
Persistence and determination alone are omnipotent.
Calvin Coolidge
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