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Here’s a simple problem: “How do you make an LED turn on when it gets dark?” You might call it the “nightlight problem,” but the same sort of question comes up in a lot of familiar situations– emergency lights, street lights, silly computer keyboard backlights, and the list goes on.

Follow these easy DIY plans and build your own solar powered battery generator.

I sure loves me some sun jars!  They incorporate several of my favorite things to mess around with:  LEDs, Solar panels, hot glue, man it’s all there and they look great to boot!

Here are step-by-step instructions on how to build your own!

Cardboard box solar ovens make a great summer project for the family. Not only are they fun to make, but they are also fun to make food in. You get to use an all natural souce- the sun!

Many things can be cooked in them. Hotdogs, English muffins just to name a few. Here we show you how to build one step-by-step.

Here is a complete guide to DIY build/convert your cell phone or PDA to be solar powered without every having to plug it into the wall outlet again. One phone is said to have not been plugged in for over 2 years!

Never before have we had the ability to charge our portable netbooks like this. Follow these detailed DIY instructions and you will be able to charge your netbook in any light. Yes. You read this correct! ANY lighting conditions.

Here is a Perpetual Spy Gadget that you can easily make a home using off the shelf parts. Using a small solar panel you will be able to listen into conversations from over a mile away on any FM radio. The best part is that this will literally run forever (or until it is discovered) Here we show you in detail how its done.

Bill Mehess has invented a system in which a clock pendulum mechanism swings magnets into coils, allegedly generating enough electricity to recharge the clock spring as well as power other devices.

Old cell phone batteries can be used for other small electronic projects.

Here is an interesting but almost useless mod. A wall plug that was modded into a self running led light.

Basically the idea is that a tower is constructed, and a large circle of the ground is covered with a material that sits 3-15 feet off the ground. Light can shine through the material, heating the air underneath the material and funneling it toward the only escape for the hot air, a tower at the center of the circle.

A Northern California inventor has created an attractive tabletop heater that adds meaningful heat into home or office powered by a single candle.

You have most likely heard of a potato battery, a lemon battery, an earth battery. Well here we present a plant battery powered LED light.

Playing around with a cheap, portable travel Alarm clock, calendar one soon realized that almost anything can be solar powered.

On a recent trip over to AllElectronics.com we found some nice little solar panels that were like the little engine that could.