Hi, There are so many ways to get this done that this is a case where the experience of the community can bring light to decide the best way to go. I am working on a device that in few words, it is an Arduino Duemillanove controlling some buttons of a cellphone (on/off etc). The idea is that it should be a stand alone device with an autonomy of at least a week. Actually it drains about 480mAh. I cannot use solar panels... but a deep cycling battery (12VDC/100A) should be enough energy.
The main question: what is the best way to use it?
In detail: Arduino can be connected to that high amps battery using its regulated port? I know it can deal with the 12VDC but what about the amps? and since the cellphone uses 3.7VCD but itcan deal with 5VCD
we have three main options:
1) to go from 12 to 5VCD, without using the arduino's regulator using something like http://www.adafruit.com/index.php?main_page=product_info&cPath=38&products_id=184 is this possible? I guess it is not the best since it may mean to waste the 12-5=4VCD resulting not that efficient.
2) to go from lower VCD to higher. so like http://www.adafruit.com/index.php?main_page=product_info&products_id=14 or http://www.instructables.com/id/The_Arduino_AA_Undershield This of course would not include the battery described before but a large number of arrays of three AA batteries to get the amps needed or the newest type of ultra-capacitors.
3) using directly the 12 VCD/100aH battery to the regulated plug on Arduino and somehow o make arduino to deliver 5vcd to the cellphone?
do you know if these options are suitable to work on this high amps setting?
so, based on your experience, what do you think about this challenge; which would be the most efficient path, Option 1, 2 or 3? do you have a better idea? thanks!!! gps