It is based upon the idea of the classic 'Lemon Battery', only this one's just a bit more special!
The main features include:
> 3x Refillable Juice containers
> Use of the Joule Thief Circuit
> LED Extension / Flexible arm
> Recycled Aluminium Cans
/// Add some juice to each container and let there be light! ///
How does it work?
When two different metals come into contact with citric acid, an electrochemical reaction occurs. This reaction generates a small potential difference or voltage. In this project, the copper coin is acting as the positive electrode and the aluminium can becomes the electron-producing negative electrode or anode. When constructing a traditional lemon battery, you can connect multiple lemons or cells in series for more energy. The one problem I've seen with directly wiring electrodes into a lemon is that after a while the lemon dries up and becomes discoloured. This inspired me to design an object with 'pods' made from aluminium cans which you could use, empty and refill.
What is this 'Joule Thief'?
For those who haven't heard of this before, the Joule Thief is a self-oscillating voltage booster circuit. The circuit is actually quite simple to make, the few components are affordable and readily available. Basically, this little circuit is going boost the energy obtained from the reaction of citric acid with the different metals into something useful to power for example a light emitting diode.