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Help Troubleshooting Robot Controller App to Modern Robotics Module Connection

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  • Help Troubleshooting Robot Controller App to Modern Robotics Module Connection

    I'm trying to get my team's Moto G4 Play phone (android 6.0.1) with the FTC Robot Controller v3.4 app to connect to our Modern Robotics Core Power Distribution Module with a Motor Controller and Servo Controller connected to it.

    Currently we have the Driver and Robot Controller phones talking to each other via the direct connect wifi, but we cannot seem to get the Robot Controller app to see any devices when scanning via the Configure Robot menu after connecting the phone via usb.

    Currently the only info I can find on this detail is on page 20 of the below pdf.
    https://www.firstinspires.org/sites/...-manual-mr.pdf

    I've added a link to a photo of the current wiring test setup. Let me know if you can see any obvious errors in the setup.

    I plan on picking up a few new usb cables tomorrow to test with.

  • #2
    Looks like the photo link didn't work, here is my 2nd try.
    https://photos.app.goo.gl/fcERztAxYduHFlIf1

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    • #3
      Try different cables. The MR cables are junk. Our connection reliability greatly improved when we replaced every cable with a good quality one from Amazon.

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      • #4
        All 4 LEDs are ON on the PDU, so that means you have a good USB connection.

        IMPORTANT. Did you build your apps with Android Studio?

        If you did, you MUST turn off INSTANT RUN. This "feature" causes many related issues.

        Change the settings, and build again. FILE/Settings/Build-execute/Instant Run (uncheck the box)

        Phil.


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        • #5
          Looks like cables were the issue. Dug around and found a few cables at home to swap out with the white ones and was able to scan the controller and find the motor and servo controllers. Now to go online to find cables to outfit both teams. What cables do you all recommend?

          https://photos.app.goo.gl/I8SQZiyFbZDrg1EI3

          We are going with Blocks, so I don't think Android Studio figures in on this one.

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          • #6
            Originally posted by brygill View Post
            Looks like cables were the issue. Dug around and found a few cables at home to swap out with the white ones and was able to scan the controller and find the motor and servo controllers. Now to go online to find cables to outfit both teams. What cables do you all recommend?

            https://photos.app.goo.gl/I8SQZiyFbZDrg1EI3

            We are going with Blocks, so I don't think Android Studio figures in on this one.
            The original Modern Robotics USB cables were pretty bad... they had very little retention. I found that good quality USB cables from Monoprice worked very well. Also, I don't remember the brand (they were some generic ones) but we found some really good right angle (90 degree) USB cables on Amazon that worked great and were easy to strain relief to the Modern Robotics plastic housings (using a strip of electrical tape, for example).

            I believe these are very similar to the ones from Monoprice that I liked (Monoprice changed the type of USB cables they carry):

            https://www.monoprice.com/product?p_id=5447

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            • #7
              I have not tried these specific brands, but if you can try some right angle cables, you might find that there are more convenient than the straight USB cables for use on your robot... something like this might be good (assuming that the cables are of good quality):

              https://www.amazon.com/StarTech-com-...usb+cable+mini

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