The halogen lights were turned on and off sequentially at different voltages programmed by an Arduino. Essentially a modification of the dump load controller using an Arduino to control the switching voltages instead of the opamps. We've given it the name Adaptive Load/Energy Controller:
Here's a video of the setup in action:
Adaptive load controller from Trystan Lea on Vimeo.
The exibit seemed to be a great sucess both because the technical side came together in time and worked! and because the kids seemed pretty interested in it and got involved and so it was a great day!Now that we have the adaptive load controller built it can be used for testing the DC current sensing circuit and can be used with the turbine erected.