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Control System - Answers

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  • #16
    Originally posted by FTC4634

    Subject: Changing the LED color of the REV Hub

    Question: We have found a way to change the color of the REV Expansion Hub's built-in status LED through the SDK, which is very helpful for debugging. Would it be allowed to change the LED color during a match at competition, with the understanding that an FTA might not be able to offer help if something were to go wrong?

    Answer: Yes, but we do not recommend this as it does limit the ability of field personnel to troubleshoot your robot. If you are going to change the color, it would be prudent to not do so until after the start of the match, allowing the LED to properly display the robot's status until the match has begun


    • #17
      Originally posted by FTC12833

      Subject: Mirrors for Cameras & Driver Station Video viewing

      <RE12> says "for example: lasers and mirrors are not allowed" specifically for directing a light source.

      Q1: Are mirrors allowed to direct an image from the field to the camera?
      Q2: Are we allowed to send this image to the Driver Station?

      Answer 1: Yes.
      Answer 2: No. There currently is no allowed way to send image data back to the Driver Station phone. Currently, data may only be returned using the telemetry functionality and there is a limit on the amount of data that may be sent at a time.


      • #18
        Originally posted by FTC3188

        Subject: Wire Gauge for REV RS485 Cable

        Is a 3 pin JST PH cable with 26 AWG wire legal for connecting two REV Expansion Hubs? We are specifically asking if the wire gauge is legal, as we could not find any information on a size requirement.

        A: No. The REV RS485 connector cable should be viewed as a Sensor cable for the purposes of determining appropriate wire gauge to use when making or extending a cable. The cables that come with the REV Expansion Hub appear to be 24 AWG. Per RE14.j.iv, the same or larger gauge should be used; 24 AWG or larger


        • #19
          Originally posted by FTC8045

          Subject: OpenFTC SDK Legality

          We've been looking at the OpenFTC / OpenRC-turbo sdk which removes Blocks and OnBot Java.

          Is it legal to use this SDK during competitions? Thanks.

          A: No.

          Teams are required to use only the official, authorized FTC SDK provided by FIRST to build their Robot Controller App.

          An unauthorized version of the FTC SDK includes any version of the SDK that modifies or omits any of the libraries included within the Robot Controller app.

          Teams are allowed to create their own classes and Java/Android libraries as well as use 3rd-party libraries, but they are not permitted to alter or remove any of the FIRST-provided libraries.
          Last edited by Han Solo; 02-07-2018, 12:29 PM.


          • #20
            Originally posted by FTC11115

            Subject: Modifying USB OTG Cable

            Is at acceptable to modify an OTG cable by adding a series switch with the sense-line, thus allowing the OTG cable to go from OTG mode to just a USB extension cable?
            The intent is to allow the phone to be charged without having to unplug the OTG cable, preserving the phone's USB connection.

            A: No. In the driver station, the switch is not an allowed component. In the robot, the addition of the switch would not be an allowed modification per <RE15> and would also fall under the general description of "Additional Electronics" and not be permitted per <RE17>


            • #21
              Originally posted by FTC8424

              Subject: MicroUSB OTG power/charging hub combination

              According to GM#1 <RE06.d> I think the following combinations would be legal for the driver station, can you please confirm:

              Wawpi Micro USB OTG power/charging hub (
              Anker PowerCore external battery (

              Thank you!

              A: Yes. The above mentioned combination of USB hub and external battery appear to meet the requirements of GM#1 & RE16