I want to be able to apply both 12 and 24VDC to an input pin though a switch. I'm switching to ground/0V. Using a couple of resistor as a voltage divider, I have the following questions: do I need a resistor between the Arduino pin and the voltage divider as well ? what is the input pin impedanc…

12 to 24V input

MarkT September 25, 2012, 10:30pm 5

You need to divide the voltage down to the 0..5V range, thats a factor of 5, not 2

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