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Circuit Design/Components for R/C Brake Lights

Discussion in 'Electronic Basics' started by Mark Webber, Dec 9, 2003.

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  1. Mark Webber

    Mark Webber Guest

    I am looking to put together a small circuit to activate red led lights on
    my R/C truck but I am unsure as to the components that would be required,
    especially how to work out when the brakes are being applied. Any help is
    appreciated.

    Thanks
     
  2. hamilton

    hamilton Guest

    // ___
    +---->|----|___|-+
    | led 220 |
    | |
    --- |
    - |
    | / |
    +-----o o-------+
    break switch

    I do not know where you can get a foot small enough
    to press the break pedel !
     
  3. Mark Webber

    Mark Webber Guest

    What kind of switch would you recommend, or is there a way that I could know
    the brakes are being applied from the receiver?
     
  4. We're gonna need to know a lot more about your truck. Like, *anything at
    all* would be a good place to start.
     
  5. default

    default Guest

    You have a receiver on the truck that outputs a control voltage to the
    brake? Are the brakes proportional control (press harder - move
    joystick further does it stop faster?)

    If the brakes aren't proportional - either on or off just wire the LED
    to the brakes.

    If the braking is regenerative (motor supplies braking torque) that's
    a different ball game entirely - more information would help.

    If you do use regenerative or "electronic" braking you'd need to sense
    the drive motor signal and light an LED when the motor was off or in
    reverse mode.
     
  6. James Meyer

    James Meyer Guest

    My old Schwin "Black Phantom" bike (I really wish I still had it) had
    brake lights built in. They used a switch that sensed when the bike slowed down
    (for whatever reason) and turned the light on. They used a small plastic tube
    with a brass ball in it that could roll from one end to the other. The tube was
    mounted horizontally with a pivot near the center. Picture a little cannon like
    they show on the Bugs Bunny cartoons. The tube is capped at each end. The end
    toward the front has a couple of contacts with flexible wires attached built in.
    The tube has a stop under the front end so that it can't pivot all the way
    level. It's still pointed up a little bit when the ball rolls toward the front
    because the bike is stopping. Once the bike is still, the ball runs to the back
    end again.

    So simple it HAS to work.

    Jim
     
  7. Mjolinor

    Mjolinor Guest

    Simplest solution is probably a mercury switch that is set to "tilt" when
    the truck slows down.
     
  8. Michael

    Michael Guest

    I did this once, by monitoring the signal to the throttle and brake
    servo. The signal to the servo is a series of pulses which vary in
    width, you can average them out with an RC time constant and compare
    them to a reference voltage to drive the brake lights.
     
  9. John Fields

    John Fields Guest

     
  10. CWatters

    CWatters Guest

    Hi Mark,

    Model transmitters, recievers and servos work on a pulse system. The pulse
    width varies in proportion to the control position on the transmitter
    (example: full left = 1mS, full right =2mS and center = 1.5mS).

    You can buy small electronic switches that will do exactly what but they are
    hard to track down. Try asking if somone can recommend a small "Electronic
    switch" on the forum here...

    http://www.rcgroups.com/forums/index.php?topic=air-elec

    Colin
     
  11. Spajky

    Spajky Guest

    the simpiest sollutions almost always work best IMHO ...
    :)

    -- Regards, SPAJKY
    & visit site - http://www.spajky.vze.com
    Celly-III OC-ed,"Tualatin on BX-Slot1-MoBo!"
    E-mail AntiSpam: remove ##
     
  12. John Fields

    John Fields Guest

     
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