I was about to start a thread on this very topic, but apparently it has been asked before!
After reading through the thread (and the links posted therein), I have a couple of questions:
1. When performing Ohm's Law calculations, what specifies the values for V
, to me, should be the supply voltage (3.3V or 5V would be what I'm using in this case). And should I
be the maximum
allowable current to pull from the pin? Just wanting to make sure...
2. What is the maximum allowable current draw for the 5V pin on an Arduino Uno? From this page
, I see 50mA for the 3.3V pin, but nothing is listed for the 5V pin.
3. Can one model a switch/pushbutton similarly to an LED? I ask this because a switch also has "infinite" resistance when not activated, but near 0 resistance when pressed.