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Hi,

im working on a project with arduino, led matrix and accelerometer, it should be autonomous , so the use of a battery is mandatory. Also it should be rechargeable so i ask you guys wich is the best solution.

I suppose Li-ion batteries is a correct choice
How is it to recharge the batteries through the usb interface? Do we need a recharging circuit ? how much voltage should it give to feed arduino +the matrix+the accelerometer?

So, i thanK you if you guide me with brief infos


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Lithium batteries are particularly intolerant of incorrect charging; simply connecting the battery to USB would be a good way to generate a fire or explosion (no, I am not kidding).

Since Li technology batteries are ~3.6V, you need either a 3.3V arduino variant with an LDO regulator, 2 cells, or a boost regulator.

There are ICs available specifically designed to charge Li cells from USB voltages (MAX1555, etc).

-j

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In addition Li batteries have to be protected from over discharge to prevent permanent damage, so some kind of low voltage cutoff/turn off is required.

 Unless you really require the higher power density ( you also pay for this increased density) you are probably better off with other less fussy types of rechargeable batteries.

Lefty

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Hey, thanks both of you for the answers.

Soo, which solution would you choose to power an arduino + a led matrix + an accelerometer and provide it with rechargeable feature?
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I think a nice solution would be this:

http://www.sparkfun.com/commerce/product_info.php?products_id=726  

with this

http://www.sparkfun.com/commerce/product_info.php?products_id=341

am i right?
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Yes you will need those parts from sparkfun, a lithium backpack from liquidware or NiMH batteries

http://www.liquidware.com/shop/show/BP/Lithium+Backpack+Stealth

http://www.adafruit.com/index.php?main_page=product_info&cPath=17_22&products_id=80 and http://www.all-battery.com/tenergy9v250mahnimhhighcapacityrechargeablebattery.aspx and http://www.all-battery.com/v3969a1plug-intypespeedyrechargeablebatterychargerforaaaaa9vbatteries.aspx

Or you can use a 6 AA battery holder with a 9V battery connector and AA NiMH batteries http://shop.vetcosurplus.com/catalog/product_info.php?products_id=965 and http://www.all-battery.com/aasizenimhrechargeablebatteries.aspx and http://www.adafruit.com/index.php?main_page=product_info&cPath=17_22&products_id=80

AA and AAA NiMH batteries are particularly useful since you can use them for your *duino as well as other devices smiley
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