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  1. #1
    RC Competitor
    Join Date
    Sep 2012
    Posts
    72

    is it possible to make Opti-drive sensor as a speed sensor?

    The current speed measure for the nitro models is based on the rpm of the engine, which is apparently not accurate, especially for those model with 2nd gear.

    I dont' know the details of how opti-drive system works. But there is a sensor monitoring the main shaft, which could provide a accurate speed.

    So I'm wondering whether it's possible to using opti-drive sensor as a speed sensor or somebody has already made it.

  2. #2
    RC Turnbuckle Jr.
    Join Date
    Dec 2006
    Posts
    4,398
    If you take a look at the transmission case of the E-Revo/Summit/E-Maxx you can see that it has the space to install the optidrive sensor there, in fact, long time ago (12/2009) I made a small circuit to measure the speed based on that sensor... I have a video somewhere but this is how it started:



    Other radios, like the Nomadio or Spectrum (same as Traxxas) use a magnetic sensor (hall sensor) to meassure speed on the main shaft...

    Can be done? Of course! Let's wait and see if Traxxas releases a better way to meassure speed on two-speed and nitro trucks...
    Last edited by danielhr77; 09-14-2012 at 12:16 PM.

  3. #3
    RC Competitor
    Join Date
    Sep 2012
    Posts
    72
    great experiment.
    there is an led on opti-drive unit blinking while the shaft rotating. so maybe a Y wire from the led could serve as a speed sensor. all traxxas needs to do is set the correct parameter in the app, or add the function for calibration of the speed in app.

  4. #4
    RC Competitor
    Join Date
    Sep 2012
    Posts
    72
    Quote Originally Posted by danielhr77 View Post
    If you take a look at the transmission case of the E-Revo/Summit/E-Maxx you can see that it has the space to install the optidrive sensor there, in fact, long time ago (12/2009) I made a small circuit to measure the speed based on that sensor... I have a video somewhere but this is how it started:



    Other radios, like the Nomadio or Spectrum (same as Traxxas) use a magnetic sensor (hall sensor) to meassure speed on the main shaft...

    Can be done? Of course! Let's wait and see if Traxxas releases a better way to meassure speed on two-speed and nitro trucks...
    traxxas better do something less expensive. my receiver only has two sensor ports. I don't want to get a telemetry expansion.

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