D.O. = digital output
D.I. = Digital Input

This used to be common terminology in HVAC Energy Management controllers, I
still use it when I am counting up I/O at the beginning stages of a project.
I guess it dates me at about 20 years ago.  ;-)

-- Lawrence Lile


----- Original Message -----
From: "Dan Michaels" <oricom@USWEST.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, May 04, 2001 4:37 PM
Subject: Re: [OT]: Pic-O-Botboard


> Lawrence Lile wrote:
> >Well, for my nickel, ICSP will be more important than the ULN2803 hooked
to
> >port B.  I'll probably plan on hacking out the RB6 and RB7 pins somehow,
and
> >adding an ICSP header *somewhere* .  I'm going to have another support
board
> >nearby anyway because my battery charger is going to reside mostly on the
> >'Bot.
> >
>
> Hi Lawrence:
>
> On the new go round, I have room for an ICSP header. Std pinout,
> no RB3.
>
> Regards the ULN2803, this chip really adds a lot of versatility to
> the design. How about direct driving 8 LEDs at 500 mA, or a unipolar
> stepper motor, or relays for hi-V switching, etc.
>
> Also, all of the RB pins are already hackable - you can jumper them
> straight to header HDR3, and cut the traces to the 2803 inputs
> without disrupting the trace to the header.
> =============
>
> >
> >I'd say ICSP is on my list of 2nd generation pic-o-botboard features.
> >Pretty much all my develpment now is done with a PIC16F877, serial LCD,
and
> >ICSP, and I port it to whatever micro I will use eventually.
> >
>
> This board has a MAX232, so it would probably be possible to directly
> connect to a "serial" LCD if you like.
> =============
>
> >
> >My personal I/O list for a bot will be something like:
> >
> >2 H bridges ( Got em on the botboard) for wheel motors
> >1 driver for a high current switch (could just be a single port pin) for
> >mowing head motor
> >RS232  for serial LCD
> >10-12 switch inputs  (mostly bump switches and a keyswitch, tiltswitch)
> >Possible  2 A/D for charger
> >1 D.O. for charger
> >ICSP
> >
> >I'll not bother with the botboard's 12C and the ULN2803 diver chip,
opening
> >up enough I/O for ICSP and all those inputs.   Other than that it looks
like
> >it will meet my needs pretty well.
> >
>
> You basically have it all here - extra RS232 chan, 4 switches on R-network
> to A/D RA3, 6 direct digital I/O, and 8 pins on HDR3 that can be used for
> port B direct, ULN2803 driver, or servo connection. MORE than you asked
for
> :).
>
> Ummm - what's a D.O. ??? [something obvious no doubt].
>
> thanks,
> - dan michaels
> www.oricomtech.com
> ===================
>
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