As I am not ex expert in power supply lines I have a doubt.
Working for a project for the road test I am working on, with a single power supply 12 V I need to power an Arduino/Arduino compatible board by one side (typically 7.5 V ?) and an external supply motor controller shield connected to the Arduino by the other (5,5V or 3.3 V 300 or 500 mA)
The power supply has sufficient power also for the motors (low power motors) but i should create the two voltage lines for both sides. Some idea for a simple circuity?
Take in account that the Arduino board is powered through its external power plug with its internal power regulators, as well as the motor controller shield.
Thanks in advance. Enrico
