The first issue I run into is how I am going to power it (the tracker and the weather station). Not being familiar with weather station sensors and servo motors, will I need two separate power supply sources (e.g. 2 separate solar panels/batteries)? I don't want to have it plugged in, so that way I can place it wherever I want. I was thinking a solar panel might be good - I live in Houston, TX and it's pretty sunny here. That coupled with a rechargeable LiPo battery might do the trick? I have a nice 9V@1W solar panel from Parallax, and about 5 or 6 of those little garden light solar pannels that, if wired in series, might be able to get me up to 9V in peak day light (maybe 4 or 5V indoors) total.
will be in my backyard,
I really wanted wireless but the climate here just won't allow it. It can stay below freezing for months in the winter and I know even with a SLA battery I'd have power issues in that kind of prolonged cold. Plus, the sun can disappear for weeks here.
The guy in the video used 3 photo resistors and calculated difference between the center and each one on the side.
I'll start reading about SLA batteries - thanks for the tip.
On the suggestion of a voltage regulator: I agree that's a good idea and I'm not familiar with how they work. If I have a solar panel that outputs 9V in daylight, that voltage level will obviously fluctuate depending on time of day and clouds, etc. The 9V should be good for an arduino to run on, but do arduinos handle the voltage fluctuations? Would it be better to regulate it back to a constant 6V? Or perhaps run everything off of the battery and only use the solar panel to recharge batteries during the day?
I searched it google but I could not able to understand.