Guys, there are many engineers in this forum that could give you information to help you work your problem; but, I hope that does not happen. This is a project meant for exploration and what you learn from your own experiments is far more important than the ultimate success of your final design or winning the challenge (I know that is hard to face somtimes). This type of project is meant to let you exercise your imaginations. Take the project for its intended purpose and just have fun with it. You might even be surprised at your own ingenuity!