While I wait for the GM862-GPS Evaluation Kit to arrive I surfed throught some websites trying to find some solution for the power source. Due to autonomy reasons the airship has to be solar powered, and luckily I found a solar panel at home (that belonged to a kind of solar fan). It's composed by three 1,5 v power cells that can be connected in series (to reach higher voltages) or in pararell (to be able to supply more intensity). Besides I measured how the tension was in open circuit with different orientations of the panel. Here are the results (which are kind of disappointing).
In open circuit and parallel connection the voltage varies according to this graph
So, in conclusion, the idea may work, but not with that particular cell. Power is just not enough (and it would be desirable that it was a little more lightweight). I searched the Web trying to find low cost, lightweight and powerful solar panels, and I found something that could be interesting. It's a kind of
roll solar cell, so it's light, and it's much powerful that my toy panel I tested at home.
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