Button doubling for UPCB

Sometimes a doubling of buttons is needed. For example some saitek converters use start and select on PS2 controllers to emulate guide button or the UPCB and cthulu uses start and select for the GUIDE / HOME button. Since the user is used to dedicated home button here's the solution.



Buy an 74hct4066 like switch. This switch connects A to B in case that C is active_high (connected to 5V).

To have clear signals I've added a pull-down resistor with 10K