I was thinking about using an architecture with several STP16 to drive a large number of LED, like in this Ledcube project http://www.hownottoengineer.com/projects/lc.html. But in my case the LED are almost all the time off.
My project work with a battery and every micro-amps saved could be a good thing.. so after testing, i realize that my STP still need about 100uA when they do nothing!
I still have few output on my Atmega328, so i was thinking of using one to drive a switch and cut the power of my STP drivers when i am not using them. So i am trying to find the best way to do that in low energy.
As i understand there is 3 solutions : a relais, a transistor or a Mofset (maybe others??) A relais seems quiet heavy and big for doing so few, and i think a transistor has always a little current passing through no?
Anyone has some advice on this kind of process? I couldn't find any tutorial, maybe i don't use the good words...
Thanks a lot :)