I'm building a project which will locate a max232 on an arduino mega prototyping shield. experience suggests that the 5 volt supply on the mega won't be enough AND I need 12 volts from some things that will be connected to the shield. There will be an lm 7805 on the shield to produce 5 volts, along …

getting 12 volts to shield prototyping board

Grumpy_Mike March 9, 2012, 4:33pm 3

The Vin pin has the voltage less the forward drop of a diode that you put in the power in jack.

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