Thanks,
I am on my iphone now but I'll upload my simple schematic
tomorrow. Button tutorial is OK but my button would be
part of another el. device which has its own power supply.
So I guess the button will carry some current too.
I guess I shoul ground Arduino together with my pedal.
Because of boincing and mechanical issues it happens that I press the pedal
but it doesn't turn ON. That's why I would like to send
signal from pedal's led light.
I want to tell Arduino that led is ON, not that I touched the switch.
If you google boss ds-1 schematic you'll easily
get many matches.
I have built wireless pedal board which works fine but
there is a little problem:
When I play gigs, my amp and pedal board
are behind me and I can't see led lights on it.
I am going to build additional led panel and
place it on the speaker monitor in front of me.
The distance from it to pedal board on bigger stages
can be even 6m ( 18 feet ).
I guess I need additional power supply for my new led panel.
Arduino will be mointed into pedal board. Pedal board is
placed on my amp.
I doubt this is understandable but I hope it will be after I uploaded
my layout