At the risk of sounding stupid, how do I use an external battery on the Arduino Micro?
At the risk of sounding stupid, what voltage battery?
For a battery that stays in the 6V to 20V range, you can use the VIN pin and let the built-in regulators do the work. For any other battery, use a boost, buck, or boost-buck DC-DC converter to get 5V for the +5V pin.
If you need the battery to last a long time, the DC-DC converter option is likely to be more power-efficien than the built-in regulators, especially for voltages above 7V.
Thank you!. I made an Arduino that looks like a flickering flame. I placed that inside an Orange plastic pumpkin. How long do you think a 9V battery would last
Generally, the answer is "not very", but that depends on the current drawn.
Back to you.
Guessing that the Arduino draws about 40mA... And an Alkaline 9V battery has a capacity of 550 mAh, that comes to 13.75 hours.
Thank you again!
...at 5V.
So 4V at 40mA gets wasted in a linear regulator.
Plus the current drawn by the LED(s)
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