pull up/down with rotary selector switch

i have rotary selector switch 6 positions, plus common 7 contacts. want keep things simple wiring each of 6 switch legs input on arduino. can i:

• connect each leg ground via own pulldown


• also connect each leg input pin


• use single 100 ohm resistor common +5v

if works, there isn't way combine pulldowns, there?

you can use internal pull-up resistors:

code: [select]


pinmode(2, input);
digitalwrite(2, high); // enable internal pull-up

then ground common terminal.  pin low signal 1 selected.

you can use external pull-down resistors, 1 per pin, , connect common terminal +5.  pin high signal 1 selected.

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