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Topic: Power Arduino Lilypad USB with coin cell batteries ? (Read 1 time) previous topic - next topic

axelleap

Hello,

I would like to know if it is possible to power an Arduino Lilypad USB with a coin cell battery e.g CR2032 (using a Lilypad battery holder such as this one) ?

Voltage : CR2032 is 3V, and the board operates at 3.3V. That should be ok?

And intensity?


I have searched on the net, but so far, the cases where somebody uses a coin cell battery is only to light up a few LEDs.
When I see people doing projects with their Arduino Lilypad, they are either using a LiPo battery or using AAA batteries.

Thanks!

CrossRoads

Quote
if it is possible to power an Arduino Lilypad USB with a coin cell battery
Not really. Coin cells are not really designed to output current at the levels need by a uC, for 20-40-60mA kind of levels.
And if they do, it won't be for long as they don't have too many maH of capacity.
Look at the curve here - 3V dropping to 2V, at 0.19mA of current, a mere 190uA. 240mAH of capacity.
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0ahUKEwixiJ3Zue_QAhVpwFQKHVYaDSoQFggoMAM&url=http%3A%2F%2Fdata.energizer.com%2FPDFs%2Fcr2032.pdf&usg=AFQjCNEjVRUHfxWZc2R4n6vjjS4C4MW7hQ
Arduino Idling at 8MHz can draw 10x that or more.
You'd also want to check the brownout fuse setting, make sure the '328P didn't reset itself at too high of a voltage level as the battery voltage drops.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

axelleap

Okay, thanks, that's somewhat what I feared... I'll purchase a AAA battery holder. That should work.

CrossRoads

3 cells would be best to feed the 3.3V regulator if that's what the Lilypad has.

Which Lilypad are you using? Link please.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

axelleap

3 cells would be best to feed the 3.3V regulator if that's what the Lilypad has.

Which Lilypad are you using? Link please.
I am using the Lilypad USB.

Why do you suggest 3 cells? And how would I do that ? (the cell holders only is for 1).

Thx

axelleap

I am using a battery holder such as this one: https://www.aliexpress.com/item/LilyPad-Power-Supply-Module-AAA-Battery-Step-up-to-5V-Converter-for-Arduino/32331606428.html?spm=2114.13010608.0.0.hVkqcK

which is meant to step up the battery's voltage to 5V.
To my understanding.

Except, it is not. But maybe that's because there's a pb with it.

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