Hi. I am not as knowledgeable about electricity as I would like,to that end I have a question.
I have a KY-004 key switch module attached to my pi.
It is rated for 12 Volt and 40ma.
My question is about shortcircuit.
The power pin is connected to pin #17 a 3.3v power pin, the ground is connected to the pin #20 and and the input pin is connected to pin #19 or BCM 10.
I have written a java program that works perfectly with it.
Technically the button switches whether to output the 3.3v to ground or the input pin.
My question is to do with short circuit. Is the ~ 40 ma safe to send accross either ground or the input pin?