hi Andy Chen,
I would research your circuit a little further. You would normally have resistors for each switch to limit current. Also, circuits often have pullup/pulldown resistors. Some of the GPIO's have these resistors installed externally, most have internal pullup/pulldown resistors that can be set with software. regards Greg ------------------------------------------------------------------------ Greg Erskine's Profile: http://forums.slimdevices.com/member.php?userid=7403 View this thread: http://forums.slimdevices.com/showthread.php?t=116271 _______________________________________________ diy mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/diy
