In SX Microcontrollers, SX/B Compiler and SX-Key Tool, VelocitąPaola wrote:

It sounds like you're on the right path.  Depending on your power needs, I would either use a Darlington pair NPN transistor or an N-channel MOSFET to control a common ground to all components.  Have the SX control the base/gate to that transistor/MOSFET.  You can have the SX scan a momentary pushbutton through either an interrupt routine, or just have it check the button when it's not doing something else.  If the button's been pressed, it can either wait for a little while or prepare to go to sleep.  It wouldn't be too difficult to have it "timeout" and go to sleep either.  Why don't you write a little psuedocode to define what you want the program to do.  It sounds like most everything will be done in software for this project; the hardware will be trivial.

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