I am making my first robot and I want to design some bump switches on the front. I am using a basic stamp for my microcontroller. And would like to ask would it be better to use a pull-up or pull down resistor configuration. Or does it even matter.
Thanks,
ENaasz
Well, I'm no expert but AFAIK it really makes little difference in this instance.
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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