| http://www.w3.org/ns/prov#value | - In some countries the number 0 operates the switch 1 time and 9 will operate the switch 10 times.The resistor used probably does not matter too much, as long as it can serve as an pull-up/down safely.Without... an arduino pin will be left floating which can cause false readings, so my best guess is you need one.Analog or digital does not matter much.
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