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Topic: arduino pro micro  (Read 149 times) previous topic - next topic


Hey guys ,
I am new to Arduino and I have done some basic projects before.
right now I am working with Arduino pro micro and need it to be portable . so I have to use a power source I have a power source like this one here


. I just want to know if I have to use a regulator or simply plug in cause I am not able to find a 5v light weight battery source .

pls correct me


Hi there!

The first detail that would make a difference is whether you want the board to operate at 3.3V or 5V.

There is a linear regulator (MIC5219) on the board that regulates the input voltage down to 3.3V from an input. With linear regulators, the input needs to be a certain amount higher than the desired output. This difference in voltage is called the dropout voltage. I checked the datasheet of the regulator, and the dropout voltage is 0.35V, which means if you want a 3.3V board, the battery must have at least 3.65V.

I checked your battery, which is a 3.7V battery. As such, the board will operate at 3.3V, but not for a very long time, especially if you are drawing a lot of current from the board.

If you want the board to operate at 5V, then you will need to get a boost regulator to bring your 3.7V battery up to 5V.

To check the board voltage, there is a small area near the USB port that has too small pads. If those pads are connected with a glob of solder, then the board is a 5V port. If the two pads are not connected, then the board is running at 3.3V. You might also be able to check the back of the board if there are any other indicating markers.

Good luck!
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Thank u for the advice . my board runs at 5v . I just want know that how much do you think might get from 2 coin cells running at 3v . I have the cr2032 cells . so can the board regulate the voltage to 5v from 6v (by the cells). Is that fine or should I use aluminium coolers


Coin cells on a stock arduino board are crap - due to power wasted for led, regulator... you will need to remove the leds, and i'd pull the reg too.

When I run off LiPo I run it right off the battery (ie, at 3.7v), so no quiescent current of reg to worry about, and a few less parts.
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