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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