portable application how?
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> I am working on portable application where I need
> to use 9 volt battery with pic and on/off keypad.
> my question is if I use 5 volt regulator in off condition it will
> drain the battery if I completely turn it off how
> can I turn it back on there is no standby voltage
> any idea? will highly appreciate.
A matrix keypad ? 4 x 4 or something is it ?
Do you have a spare that can turn a FET on ? The PIC could
connect to this spare and the FET gate to turn it off
See also: massmind.org/techref/microchip/ios.htm?key=port