I came out this idea. I want to use gesture to control car and make a game. The program has two inputs ( two camera ) for two persons. When one of them wave faster than another, he/she will win the domination which can control car’s direction. So, the rule is try to win the control and make ball into your competitor’s goal. But seriously, you have no idea how hard to touch the ball! It’s interesting to see the car gets crazy all the time!

Here is my transmitter and Arduino. Since the Arduino only accept 5V, transmitter needs 9V as power supply. So, I need Tip120 to adjust the voltage. Each direction needs one chip.

Two cameras on the wall.

The demo video will explain better how the setting works.