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. Having just recieved a big box of wierd little NiMH batteries (Thanks, Tim!) I'll need to build a custom charger. 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. 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. -- Lawrence Lile ----- Original Message ----- From: "Roman Black" To: Sent: Friday, May 04, 2001 4:04 AM Subject: Re: [OT]: Pic-O-Botboard > Dan Michaels wrote: > > > >> After dawdling for months on this project, I finally got around to > > >> designing my PIC botboard - which we talked about some time ago. > > >> Basically, a PIC-based replacement for the 68HC11-based botboards. > > >........ > > > > >Preliminary info at: http://www.oricomtech.com/bot40.htm > > > > > Thanks for the feedback, guys, both onlist and offlist. > > > > No room on the present board for ICSP. > > > Ouch!! That hurts... Really hurts. Especially for > most of the target markets like small bots which > need to be re-programmed all the time. > > All you need is three wires, VPP,SDA,SCL on a tiny > 3-pin header. Then just tie MCLR to +5v with a > 47k resistor. Your board can be powered from it's own > +5v supply and the common GNDs can be connected. > All my small projects have this 3-pin ICSP header, > and we use the Picstart to program them. A 4-pin > header (including GND) is even better but you're > the one with real estate issues... ;o) > > Are you saying you can't fit a 3-pin SIL header > (and one 47k resistor) anywhere on that big board?? > So I would have to glue one on and run wires to > the PIC pins?? > ;o) > > -Roman > > PS. The op-amp circuit looks great! > PPS. Are you re-subscribed yet?? What happened? > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.