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I think we should have a on-board regulator
Standard power bus should be 5V DC.Modules operating at less than 5V should have on-board voltage regulator and buffer circuitry to allow 5V I/O.Modules accepting greater than 5V (eg. 12V) which contain regulators to supply 5V to circuitry on board should also be able to supply other boards with 5V power to a minimum of 200mA.Modules accepting greater than 5V (eg. 12V) to power high voltage components (eg, DC motor drivers) do not need regulators for modules 5V circuitry. They may draw 5V from another module.