breadboard prototyping of the powerboost + battery + soft-power-button circuitry

off (powerboost enable pulled low)

on touch of the push-button -> power on!

the three wires running to the top and out the image will be connected to the raspberry pi, and give it +5V, Gnd and a control/sense wire to the soft-power circuit - that way it will be able so detect further button pushes shutdown properly and cut the power by pulling the control-wire low

further description of the soft-power circuit is available here:

http://www.mosaic-industries.com/embedded-systems/microcontroller-projects/raspberry-pi/on-off-power-controller