Which communication is best for underwater bots ?

Discussion in 'The Projects Forum' started by Abhinav Himanshu, Feb 19, 2016.

  1. Abhinav Himanshu

    Thread Starter New Member

    Feb 18, 2016
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    I have been asked to design an underwater robot having pi and arduino in it . But since the bot is underwater so we are facing a problem on which communication board is best suited , we are designing the bot work at max 2 m depth , please suggest some communication board that we should use or anything else if possible . :):):D
     
  2. hp1729

    Well-Known Member

    Nov 23, 2015
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    Over what distance? Ultrasonic? Is cost a big factor? Sound (DTMF)? Is other wildlife going to be a problem (sharks, dolphins, whales)?
     
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  3. Papabravo

    Expert

    Feb 24, 2006
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    I guess the Navy likes sound for underwater communication. Not sure you have much bandwidth to work with however. You might be able to do 300 bits/sec with AFSK and a hydrophone.
     
  4. Picbuster

    Member

    Dec 2, 2013
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    You are facing a world wide problem submerge 2mtr is not the problem it's the distance.
    Using low power ultra sonic does few hundred meter (15-20Khz depending salt/ temperature).
    However FSK modulating is a problem echo, Doppler and distortion plus a narrow band due to things mentioned above.
    All possible but it will take a lot of signal processing and I don't think that a standard board is available as yet.
     
  5. Abhinav Himanshu

    Thread Starter New Member

    Feb 18, 2016
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    max 3 m distance between transmitter receiver (assume both in water ).As cheap as possible. Wildlife , not a problem.
     
  6. hp1729

    Well-Known Member

    Nov 23, 2015
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    Wires not allowed?
     
  7. Abhinav Himanshu

    Thread Starter New Member

    Feb 18, 2016
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    ok , let say wires are allowed.Then which type of communication protocol is suitable , remember i am using raspberry pi , with bot control i even want to get video data from bot camera to my handheld controller , so what should i use.
     
  8. Externet

    AAC Fanatic!

    Nov 29, 2005
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