This is like asking what is your favourite colour. Your going to get a lot of answers.There is also a lot of information anyone would need to be able to give a realistic answer, what you expect it to do, budget , time scale skill level of builder. ultimate reason (a toy or hobby or something more commercial.)I guess your thinking about an autonomous ROV - For a start personally, I would go with the Picaxe system http://www.rev-ed.co.uk/picaxe/Relatively cheap, fairly powerful and fast to develop with masses of expert support in their forum. Once you have a handle on the real requirements and scope of the project you will be in a better position to look at other options.
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+1 to that.(They're waterproof too #;¬)
basically the project is this..'Design and fabrication of RC Submarine'• To acquire basic knowledge in the field of hydrodynamics, fluid mechanics and Submarine design.• To design a new model of RC Submarine by using proper standards and procedures.• After the completion of conceptual design, the iteration process will be commenced to obtain the best suited and efficient design of RC Submarine.• A parallel work in the field of electronics and Radio transmission will be initiated with the design process because if the design is finalized then without wasting the time.• After finalizing the design there will be detailed performance analysis.• The material and structural selection will be finalized as per requirements.• Fabrication is an essential part of the project which will be performed after the completion of every aspect of design and performance analysis.• Implementation of the circuitry and control block will be implemented according to the design.
it is radio control...
Do you mean RC (radio and/or remote controlled), or do you mean robotic?If RC, you may not need a microcontroller at all (though you will need to think about how you're going to get a control signal through water).
As it is said, "How long is a piece of string ? "Specify all the other systems, then decide what you need. Steve