Over the weekend I did a little project with the Arduino. It's very simple. There are three LEDs (red, green and blue) that randomly fade up and down in brightness and they are placed inside a ping pong ball. The ball diffuses the light and so a constant blending of colours occurs. It's quiet nice but unfortunately the green LED is weaker than the other two so it's not exactly as good as I'd hoped. Here's a short video demonstration:
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