Master rocker switch for 2 batteries

Using Arduino Project Guidance
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Hi, need a little help. I have 2 batteries that need to work separately. One for Arduino mega 2560 and the other for MB-102 power supply. The rocker switch is the master switch, when the switch is turned OFF, all have to turn OFF. And when I turn back ON, all have to turn ON. If the battery for the Arduino Mega, is low and stops working, the MB-102 power supply must keep working.

How to connect the power supply(MB102) to the master switch?

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That is why double pole switches are made.

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What do you mean by double-pole switches???

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This should help. What is a Double Pole Switch? | Herga I also recommend you do a few tutorials on basic electronics.

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What is that 9 volt battery? A PP3 fire alarm battery? If so, 6x AAA would be much better.

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