Powering my Arduino Uno Project

Hello everyone,

Currently I am working on a GPS project for the Arduino Uno. It is time now for me to start thinking about how I am going to power my system. Here is a listing of the components in my system:

Arduino Uno(7-12V): http://arduino.cc/en/Main/ArduinoBoardUno
GPS(8-30V): Garmin-18 PC http://www8.garmin.com/manuals/425_TechnicalSpecification.pdf
Memory(2.7-3.6V): Atmel (AT25DF641) Smart | Connected | Secure | Microchip Technology
XBee(2.8V-3.4): http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=XB24-AWI-001-ND

Currently all the componets except the GPS are powered by the Arduino board, which is powered by a usb connection to my PC. The GPS is plugged into a cigarette lighter adapter which is plugged into a wall outlet.

I was thinking I could power my system with some kind of 9-12V battery and step the voltage down when needed with various circuitry.

I am concerned about the current draw, as this is very unfamiliar to me. I do not want to blow things up in my project :fearful:. Does anyone have any advise or suggestions to help me out?

Thanks to everyone.

The board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.

3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.

Current - Receiving 50mA
Current - Transmitting 45mA
Now, it doesn't make any sense to me that the power required to listed is more than the power required to talk, so I wrote to Digi, and asked. They assured me that this is indeed the case. Kind of like people, I guess. Easier to talk than listen. Anyway, the XBee can be powered from the 3,3V regulator on the Uno. These values are maximums, so the normal values will probably be less.

The memory has very low current requirements, and only when reading or writing, so I think you could also power that off the 3.3V regulator, too.

I was thinking I could power my system with some kind of 9-12V battery and step the voltage down when needed with various circuitry.

Stay with the low end of that range, to keep the Arduino regulator cooler. You really only need worry about powering the Arduino and GPS from the battery. No additional regulators will be required.

Kind of like people, I guess. Easier to talk than listen.

That is rather a mystery. Plus throw in the fact the evolution gave us two ears but just one mouth and we have a real mystery there. :wink:

thanks for the help. do any of you know of a similar project? i wonder which battery they used....

Hi,
I'm wondering how you got the Garmin String into the Arduino, I'm trying to put together a project that uses a 18x LVC and all I get from the serial Monitor is a bunch of gibberish.

thanks for any help!