I'd be interested in seeing the source code. I've never had any reason/opportunity to learn ARM or embedded programming.

Where the board is situated there is no sun coming in to there. I will have to make a battery connection and connect to a laptop and take the whole thing outside to get the sun. But there are no laptops here that have serial connections. You will all have to be patient until I can get this all worked out.

Wouldn't a flashlight and a magnifying glass be a suitable Sun replacement?

I don't know, is it? The sun has a lot of IR and UV that a normal light bulb won't have, right?

the sunlight spectrum is filtered by ozone layer and athmosphere.

there are some lamps that tend to reproduce the sun light, fer exmaple in the "genius at work - weed farm busted" topic.
you can simulate sun light with a combinaison of existing lights.

mercure, sodium, halogen, fluo tubes.

a 150W mercure lamp at 80cm have the sunlight equivalent power.