basic Stamp Push button sensor

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windozeuser

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How exactly does this work?

Does Vdd "overcome" the voltage of Vss so P3 is "1"?

Thanks
 

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windozeuser said:
How exactly does this work?

Does Vdd "overcome" the voltage of Vss so P3 is "1"?

Thanks
Click to expand...

R2 is just used a pull down , so that if the switch is off the pin is grounded , to make it less suseptable to spurious noise .and the 220 is a current limiting resistor
 
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