Well, I'm no expert but AFAIK it really makes little difference in
Pullup or pulldown comes down to which is more convenient when laying
out the PCB. Usually for bump switches I use pullup resistors, but for
a keypad I use pulldown resistors.
I understand current drain through a STAMP input is very low (at low
frequencies) because they're high impedance so whether it's drawn high
or low by a resistor makes no difference.
The only real difference is to your coding. When using a pullup
resistor, you test for a logic low and vice versa.
Why not breadboard the different configurations to try them out?
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