Hi. I'm working on a mini-sumobot and he needs a BANNED. I am using 2 small Lipos for the motors, but was just going to use a 9V bat to drive the arduino pro.
The 9V bat is 46 grams, so there is some real opportunity to shrink down in that front. Would 2 CR2032's have enough current to power the arduino effectively? It seems to be the lightest combination to get to 6 volts. I hope it would have enough mAh to get through the tourney, but I can bring extras.
What do ya'll think? I'm open to other suggestions for other alternatives.
Thanks.
2 CR2032's to drive an Arduino Pro
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- westfw
- Posts: 2008
- Joined: Fri Apr 27, 2007 1:01 pm
Re: 2 CR2032's to drive an Arduino Pro
You'd be better off using another LiPo...
An Arduino draws significantly more current than CR2032 style batteries are designed to provide. (they're widely abused, and it would probably work for a while, but it wouldn't be good.) (It's certainly something you could try as an experiment.) You can drive the arduino "5V" supply directly from the ~ 4.2V battery (but beware over-discharging if it is a bare cell.)
You could look around for one of those LiPo based "emergency cell phone charger" things. Radio Shacks near us were closing out these: http://www.digipowersolutions.com/store ... cts_id/687 They're seriously cute; sort of a micro minty-boost.
An Arduino draws significantly more current than CR2032 style batteries are designed to provide. (they're widely abused, and it would probably work for a while, but it wouldn't be good.) (It's certainly something you could try as an experiment.) You can drive the arduino "5V" supply directly from the ~ 4.2V battery (but beware over-discharging if it is a bare cell.)
You could look around for one of those LiPo based "emergency cell phone charger" things. Radio Shacks near us were closing out these: http://www.digipowersolutions.com/store ... cts_id/687 They're seriously cute; sort of a micro minty-boost.
- jeffjohnvol
- Posts: 13
- Joined: Mon Oct 04, 2010 7:35 pm
Re: 2 CR2032's to drive an Arduino Pro
Thanks. Yeah, I figured there wouldn't be enough. The Lipo is only 3.7V though, so I would need two of them, whose weight would be as much as a 9V.
Since my first post, I've been thinking about using 2 CR123a's. They are 3.7V each and would be 11 grams lighter than a 9V. Any thoughts on that?
Thanks.
Jeff
Since my first post, I've been thinking about using 2 CR123a's. They are 3.7V each and would be 11 grams lighter than a 9V. Any thoughts on that?
Thanks.
Jeff
- westfw
- Posts: 2008
- Joined: Fri Apr 27, 2007 1:01 pm
Re: 2 CR2032's to drive an Arduino Pro
CR123's (or CR2) should work fine. Are you talking about the rechargable Li-Ion sort? If not, they're only 3V each...
You could also use a 3 to 3.7V cell with a minty-boost like circuit to get up to 5V.
You could also use a 3 to 3.7V cell with a minty-boost like circuit to get up to 5V.
- jeffjohnvol
- Posts: 13
- Joined: Mon Oct 04, 2010 7:35 pm
Re: 2 CR2032's to drive an Arduino Pro
Litihium Ion. I would run two in series to get 6 volts for the 5 volt version of the Pro I have.
Thanks.
Thanks.
Please be positive and constructive with your questions and comments.