Olin,

some people seem to have problems with reading a *whole* text. =


RTFTE (=3D read the f*** text entirely)

I said twice now, that everything is ready, all components in place, all
soldered, all assembled, all wired. Capito?

*Of course* I would prefer a professional jumper or even better a switch or
a bluetooth port to make a wireless setup or, or, or and *of course* I would
add a current limiting R and a defined C if I were at the beginning or even
close to the end of my pcb design.

My idea is *strange* as the topic says. But also sometimes strange ideas
lead to good results... The good thing with my idea is, that you can use it
with ready made devices which have an unused PIC pin near by any Vdd or Vdd
pad. =

Just a software item...

Peter


-----Urspr=FCngliche Nachricht-----
Von: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] Im Auftrag von
Olin Lathrop
Gesendet: Montag, 17. August 2009 15:17
An: Microcontroller discussion list - Public.
Betreff: Re: [PIC] Help me to confirm a strange idea

Peter Feucht wrote:
> RB5 is located near Vdd, so I simply make a short between Vdd and RB5 =

> if I like to have model 2 (or leave everything as is for model 1).
> When starting up the circuit the first time or when batteries are =

> changed the software looks for the state of RB5. To do this, I output =

> a log.0

Huh?  I think you mean driving RB5 low.

> to RB5 and read the state immediately. If there is no connection to =

> Vdd it should read zero again. But if there is a connection it should =

> read log.1.

I don't like this because you are driving a output low that is tied to Vdd.
If you want a solder blob to select between two models, It would be better
to put proper pads for that and pull up or down resistor and maybe a 100pF
or so holding cap.

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