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how to make a communication b/w two robots connected to the central system?

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Sounds like a great project. If the robots are going to be in the same plane with reference to each other then infra red would be good. Otherwise ultrsonic would be best. Ultra sonic can even go from room to room sometimes. If money isn't too much of an object and you want greater range them 900mhz or 2.4ghz radio modems would be pefect.

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