> > Anyone have an idea of how to hook up a logic level MOSFET so that a
PIC
> > can be push button started but turned off via software?
>
> This is easy to do if you have a power supply chip.  I designed a
> performance meter (see it at www.race-technology.com) which runs
> off two AA batteries using a switching chip to get the +5V, when a
> button is pressed to turn it on, the pic starts up and latches the
> supply chip shutdown line.  When it is turned off the pic just sets the
> line low and off goes the power.

Unless you really absolutely need the power off completely, you could
leave the PIC in sleep mode with the pushbutton hooked to an interrupt.  A
sleeping PIC takes only a few uA.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@cognivis.com, http://www.cognivis.com

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics