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what about RF remote controls for servos an data transmission?

Discussion in 'Electronic Basics' started by Matthias Broersma, May 31, 2004.

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  1. hello everybody,
    im starting to build a remote controlled catamaran with two engines (one in
    each floater). the model will be in large scale, length about 3 meter. the
    engines will be derived from big machinery...dont know yet what depends of
    anyway i will need a way to control remotely this big guy.
    requisites are:
    - i need to be able do command at least 4 servos (from laptop would be nice)
    - i need a range that is not less then 300meters
    - i need to send data back from the boat to a laptop (using some kind of
    serial connection) for usage with gps and other sensors.

    the plans for my boat are all ready and well, i have trouble thoug
    understanding this electrical stuff.
    i heard of RF remotecontrols...some of them with serial interface.... well i
    need all the usefull info i can get.what do i need?how does it work?links

    Thanks to all
    and sorry for my bad english
  2. Rich Grise

    Rich Grise Guest

    Look into radio controlled modeling. They make all kinds of adapters -
    I actually worked with a unit that used a standard RC channel, with
    a motor controller - it plugs into the servo jack, and instead
    of position, the joystick controls speed. That channel would need
    some kid of fail-safe, because when those RC receivers lose the
    signal, the servos hold position, which means that the motor
    controller holds the motor at the same speed. I made it happen

    And the circuitry of their servos could be adapted to any size,
    or you could take their signal and roll your own.

    Have Fun!
  3. Tim Auton

    Tim Auton Guest

    R/C modelers (the ones with the bigger planes usually) use safety
    cut-outs, which will set the position (speed) to a pre-determined
    point when the signal dies. Find them at R/C flying shops specializing
    in large-scale models.

    If you want to go for electric power, you might want to look at some
    websites for fighting "robots" (BattleBots, Robot Wars etc.) - they
    have plenty of experience in using standard R/C kit to control big
    electric motors.

    For a petrol engine it's easy - get one with a centrifugal clutch
    (from a lawn mower, for example) and stick a servo on the throttle.

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