Power switch circuit

[bonterra]

I found this quiet tricky.. the switch is actually to turn on more like a reset. if you are running on the system with an OS then you do not want to have a off switch that corrupt the OS. when connect the power the board automatically turn on. but if you shout down the system from the OS. you do not need an off switch. you only need the button to turn on the system after you shutdown from the OS.!!! this is working. beside this would be more secure to switch the power supply off to avoid any power during attaching or handling the board an connections.

Why not have the button send a shutdown signal to the OS, like any other modern OS?

Just about every computer will send a soft shutdown signal (to the OS) on a short press and a hard shutdown signal on a long press.