Hello, I don't seem to be able to measure the current consumption increase when 5V is apply to the digital input pin 2 (used for interrupt).
I'm trying to make a battery powered Arduino, and I'm using a reed switch that wakes up the Arduino from sleep using the second interrupt pin. There is a little bit of current that flows when the reed switch switches and 5V is applied to the input pin for interrupt. Is the current flow there negligible? I might be able to change the "sense" of the reed switch - make it open most of the time instead of closed most of the time to decrease current drain.
I have a sneaking suspicion this is where internal pull-up or pull-down resistors come into play, but I don't really understand how they work internally.
1) Is current consumption on input pins low enough to ignore? 2) can this current consumption be decreased by doing something with these the internal pull-up or pull-down resistors? If so, does this trick also work on the interrupt pins?