I released today a solution - simple and very low cost - to have a complete power supply for Arduino applications where the components needs to be powered with medium-high currents at various voltages.ATX Power 1.1
is the power switcher based on a logic that recreate the same behaviour powering a computer desktop.
Using an ATX Power Supply
you obtain a power unit giving to your circuit +3.3, +5, +12 V as needed.
I received on IRC some considerations that it's so simple to short-circuit the power-on signal to the COM on the ATX Power Supply. It's not real: the logic circuit shows when the system is powered-on and when it is in standby mode. Then, as described in all the sites I read and on the ATX12V Design Guide
, short-circuiting the power-on signal of an ATX Power Supply directly to the GND should seriously damage the power supplier.
To see the project, circuit, images and more, go to the following link:http://www.contesti.eu/opensource/atxpower
This small circuit can work with a variety of ATX Power Supply units, from 150W to 400W.