I opened up a remote to see how the keypad works.
I see some interlocking traces on the printed circuit
board below each button. When the button is pressed
they get shorted.
I tried to short them myself and it has the same effect
as pressing the button
I measured one set of traces they were at 3.3 v the
Second trace was at 0v
So I presumed when I short I connect the 0V to 3.even
But here is what is strange. If I take 3.3v and connect
It to the trace that is at ground it does not have the same
Effect as pressing the button. But shorting the two works
This baffles me.