how many 9V batteries are required for arduino mega 2560 ?
Are the 9V batteries of a type that I know as PP3 ?
What is the Mega being used for and how long is it required to run for ?
it depends on
- how long do you want your Mega to run ? (and what's powered from there)
- the type of 9V battery
1 basic one will get you going... but not for long probably if you power other stuff ..
None at all - it is not required that you use a 9V battery!
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9v into the Vin pin will work, the length of time depends on what else is being powered.
Use a 6 battery AA holder.
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