Powering an Arduino Project in a car w/LiPO backup

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mzelios
 
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Powering an Arduino Project in a car w/LiPO backup

Post by mzelios »

Looking to build a car/gps finder based on
Arduino Micro
Adafruit Ultimate GPS breakout
Adafruit GSM breakout

Code will receive SMS text request via the GSM,
parse the GPS data (thanks for the Adafruit Library!) and text the
coordinates, heading, and speed back to me.

Would like the whole thing to run off car power, but include a battery backup
and charger.

I like the looks of the USB LiIon/LiPoly charger - v1.2 (prod #259)

I can send 12v through an LM7805, then to the "DC IN" of the charger.
The "Load" output is what needs to power the Micro, GPS, and GSM.

Whereas Arduino Micro wants 7v-12v, am I thinking along correct lines?

Thanks!

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adafruit_support_bill
 
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Re: Powering an Arduino Project in a car w/LiPO backup

Post by adafruit_support_bill »

With a 12v input, a 7805 is likely to overheat at any substantial charge rate. One of these will be much more efficient. https://www.adafruit.com/product/1385

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mzelios
 
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Re: Powering an Arduino Project in a car w/LiPO backup

Post by mzelios »

Wow! Thanks for the Quick reply !!!!

What I normally do is take a hammer to one of those cheap
BANNED-lighter -> USB things and be done with it.

So what about keeping the whole shebang running of LiPo/Lion if the
car's battery is disconnected?

Will a 3.7v battery suffice? Again, Arduino doc says 7v-12v in

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adafruit_support_bill
 
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Re: Powering an Arduino Project in a car w/LiPO backup

Post by adafruit_support_bill »

You could use a 3.3v Trinket Pro instead of the Micro: https://www.adafruit.com/products/2010

Or you could use a PowerBoost500C: https://www.adafruit.com/product/1944

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mzelios
 
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Re: Powering an Arduino Project in a car w/LiPO backup

Post by mzelios »

That's the one!
Thanks Again!

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