And now for something completely different. Boris Landoni from Open Electronics has constructed and documented his robotic fish. With a body made from polystyrene, he modified it to have three vertical joints. Each joint contains a servo which in combination cam created the required movements to emulate a real fish. Sharp infra-red distance sensors have been added so the fish doesn't swim into objects, and the control is a simple matter of programming the Arduino compatible. The final results are successful - for example (turn volume down):
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