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Powering an Arduino with 9V batteries?
I'm looking at powering my Arduino with 2 9V batteries wired in parallel (2 is optional, but if you think a single 9V battery can power an arduino + 16 LEDs simultaneously for >3 hours, let me know).
I have a few different options for linear regulators. LM350 (3A), C33275 (300mA), LM7805 (1A, 5V) - I'm guessing I should use the LM7805 because it's fixed at 5 but I'm not sure.
I'm not too electronics-savvy so as much help as you're patient enough to give would really be appreciated!
Comments
Best Answer 7 years ago
WHICH Arduino - there are dozens ! An Uno will run on 9V directly.
Answer 7 years ago
Sorry - ATmega328
Answer 7 years ago
An Atmega328 is just a chip. Do you HAVE an Arduino board, or a chip programmed with a bootloader ?
Answer 7 years ago
It's a board called Diavolino, it has space for a voltage regulator that I'm not currently using because the one I have doesn't fit in the holes (I'll make it later as necessary)
Answer 7 years ago
You should be able to squeeze a 7805 into that, but it will get quite warm with 160mA x 4V dissipated in it.
Answer 7 years ago
My 7805 is in the following form ( http://bit.ly/17mcyb9 ) So I can always screw a heatsink on if necessary. Back to my original question, would the 9V batteries be enough?
Answer 7 years ago
An Alkaline 9V battery has around 500mAHr capacity. Two, all being well, 1000mAHr. Taking your estimated consumption from my numbers - 160mA, then you'll get roughly 1000/160 hours from them. More than three.