I was on my usually walk at night when I saw a LED shining dimly thru a plastic dome. I picked it up and it was the top of a walkway solar panel LED that someone had kicked off its post. I didn't see any other walkway LED posts by the sidewalk and yard, so I kept this one! Ground Score! I dismantled it and uncovered a rechargeable AA battery, a cheap LED, a photocell resistor, a PCB with software to turn on LED when dark + charge battery when light, and best of all...a solar panel with red & black wires! What are some ingenious methods for using this solar panel? Is there an Arduino sketch out there to charge a Li-Ion battery from a solar panel cell?
Lets say I had many of these cheap and small solar panels, then I would want to wire them up in parallel to boost the voltage it can provide. Is that correct? When do I know to wire power supplies up in serial or parallel. Thanks!