well i was thinking in using photoresistors as inputs for my matrix keypad.
under a painted plexiglass surface living open spaces only for my 16 photoresistors.
so with every push of my finger over the photoresistor i would cover the light and get my push.
i am not really sure if those schematics are usable though. while it is not a button that allows current only when you press it.
photoresistors allow current all the time. how can i make a 4x4 matrix keypad with photoresistors ????????????
help !