backup battery circuit

avenderin

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Mar 16, 2017
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I made an Arduino alarm clock, I want to connect it to a battery for power fail safe.


If I connect a diode to the positive terminal of a 9v, and connect it to my powerline from a 12v DC power transformer, then both into my mega2650: (input voltage 7-12v, operational voltage 5v)

a) will it work?

b)does the battery drain even while the main power is on?

(I dont neccesarially need a charging circuit, and think I want to avoid one)


c)are there any precautions or suggestions I may not be aware of?
 

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