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  • Miscellaneous Robot Electrical Parts and Materials - Answers

    Answers to questions about Robot Electrical Parts and Materials that do not fit into another category can be found in this section.

  • #2
    Originally posted by FTC8424

    Subject: Powered USB Hubs within Robot

    Hello, GDC, thank you for a great game this year!

    Question: We're looking to use an external camera and know that we have to use an unpowered USB hub for connecting it to the Robot Controller and then connecting that hub to the REV Expansion Hub. Is this hub a legal one as long as we don't have an external battery plugged into it at all (e.g., just use it as a unpowered USB hub)?

    TUSITA USB Adaptor

    Thank you!

    FTC8424 Cyber Eagles
    Answer: We appreciate the kind words! Yes, the above USB Hub/OTG adapter is legal under current rules. Note that the rules for USB hubs within the robot were updated in the 1.3 revision of Part 1 of the Game Manual. Take a look at <RE13> and <RE14>.c.iii
    Last edited by Buckaroo Banzai; 10-08-2018, 10:08 PM.

    Comment


    • #3
      Originally posted by FTC4634

      Subject: I2C to SPI Bridge Module

      Question: May we use an SC18IS602 I2C to SPI Bridge Module to control addressable LED strips?

      It seems to meet all the requirements specified by <RE12-C>:



      COTS: yes
      Interface module: yes
      User-programmable microprocessor: no


      Answer: The part number referenced is a IC, not a module. If it is used in a module that does not include the user programming, it would be allowed.

      Comment


      • #4
        Originally posted by FTC4634

        Subject: Phone Flash as a Light Source

        Question: Does the phone's camera flash count as a "focused or directed" light source?


        Answer: deleted original "Not allowed" answer

        Update: While the reflector in the camera flash makes it directed and focused, after discsussion with the entire GDC, we have decided to reverse the decision and allow the camera flash to be used to aid vision processing.
        Good luck with your vision code!
        Last edited by Buckaroo Banzai; 10-23-2018, 06:40 PM.

        Comment


        • #5
          Originally posted by FTC4634

          Subject: Quad Alphanumeric Display Backback

          Question: May we use an Adafruit Quad Alphanumeric Display w/ I2C Backpack on the robot?

          It consists of two parts, a simple LED matrix, and an I2C interface module. This seems to satisfy the requirements of <RE12-C> but we'd just like to confirm that it's allowed.


          Answer: Yes. The module described is an example of the types of modules allowed by <RE12>.c

          Comment


          • #6
            Originally posted by FTC10131

            Subject: Powered USB Hubs for UVC Cameras with Modern Robotics Equipment

            Question: The recent update to Game Manual Part 1 allows powered USB hubs that connect to a REV Expansion Hub, to better power and support USB webcams.

            Are there any comparable legal configurations for using a powered USB hub with the Modern Robotics electronics? If not, is there any supported hardware that allows USB webcams to be powered and used reliably with the Modern Robotics electronics, or must teams use the REV electronics if they wish to use USB webcams?


            Answer: Yes. For use in connecting/powering a USB camera, a powered USB hub may be used in a manner parallel to the recommended use for REV Expansion Hubs. Since there is no 5v auxiliary power port available, the only power option will be a USB battery pack

            Comment


            • #7
              Originally posted by FTC4634

              Subject: I2C Controlled LCD module

              Question: Since alphanumeric displays with I2C interface modules are allowed, would a standard 16x2 LCD with an I2C interface module also be allowed?


              Answer: <RE12>.c allows light sources controlled by compatible ports of the REV Expansion Hub or Modern Robotics Core Control Modules, this would include I2C ports

              Comment


              • #8
                Originally posted by FTC10131

                Subject: Modifying/Replacing the Connectors on the allowed grounding strap

                RE14 l. says "Teams that have electronics with Powerpole-style connectors may also use the REV Robotics Anderson Powerpole to XT30 Adapter (REV-31-1385) in conjunction with the REV Robotics Resistive Grounding Strap." May teams also replace the XT30 adapter on the Grounding Strap with a Powerpole, per RE15? RE15 says in part "Approved electrical and electronic devices may be modified to make them more usable; ... Examples of modifications that are allowed:...Replacing or adding connectors on wires" ?


                Answer: [deleted original answer]

                Important Update: The previously given "Yes" answer has been updated to "No". <RE14>.l explicitly disallows use of anything other than the REV grounding strap adapter. By extension, this disallows any modifications to the grounding strap or its adapter.
                Last edited by Buckaroo Banzai; 10-30-2018, 02:34 PM.

                Comment


                • #9
                  Originally posted by FTC8397

                  Subject: LED Control Electronics

                  Would the following be an allowed light source?

                  https://www.ledsupply.com/leds/cree-...high-power-led

                  Also, our plan would to be to power the light source using one of the 5v Aux supplies on the Rev Expansion Hub, and to switch it on and off using one of digital ports, along with either:

                  a)A transistor,
                  b)An op amp, or
                  c)A solid state relay.

                  Any of these would also require current-limiting resistors.

                  Would these approaches be allowed?


                  Answer: The LED is an allowed device. The transistor, op amp and relay all fall into the category of "other electronics" and would not be allowed.

                  Comment


                  • #10
                    Originally posted by FTC7253

                    Subject: Camera Flash

                    Last year, there was a specific forum rules clarification allowing the use of the camera flash:

                    It would seem that the camera flash is no more of a directed/focused light than any LED (including the color sensor LEDs).
                    Please clarify/reconsider. Why was there a forum post allowing it last year, but one disallowing it this year?
                    The camera light can significantly improve image processing results, as it helps mitigate the effects of different lighting conditions. This affects the use of the camera for both Vuforia and other image processing (i.e. OpenCV). Under these use cases, the camera light is not being used to hinder other robots - simply to improve image capture consistency - primarily in auton where the bots will not be interacting with each other.
                    Velocity Vortex was a clear example of autonomous issues that can be caused by extremely varying ambient conditions. Please reconsider decisions that could go down the same road again.


                    Answer: In general, forum posting from prior seasons about are not automatically included into current season.

                    As to the camera flash, every phone flash examined included a one of several variants of parabolic reflectors on the back side of the flash LED, designed to direct and intensify the light output in a primary direction.

                    While the camera flash based on the above would not be allowed, In discussion with the entire GDC, we reconsidered and came to the conclusion to allow the camera flash to be used to aid vision recognition (a skill we wish to encourage among teams!).

                    The prior posting will be amended with a note making sure that it is clear that the flash is allowed.

                    Good luck with your vision code!

                    Comment


                    • #11
                      Originally posted by FTC7253

                      Subject: Camera Flash

                      Last year, there was a specific forum rules clarification allowing the use of the camera flash:

                      It would seem that the camera flash is no more of a directed/focused light than any LED (including the color sensor LEDs).
                      Please clarify/reconsider. Why was there a forum post allowing it last year, but one disallowing it this year?
                      The camera light can significantly improve image processing results, as it helps mitigate the effects of different lighting conditions. This affects the use of the camera for both Vuforia and other image processing (i.e. OpenCV). Under these use cases, the camera light is not being used to hinder other robots - simply to improve image capture consistency - primarily in auton where the bots will not be interacting with each other.
                      Velocity Vortex was a clear example of autonomous issues that can be caused by extremely varying ambient conditions. Please reconsider decisions that could go down the same road again.


                      Answer: In general, forum posting from prior seasons about are not automatically included into current season.

                      As to the camera flash, every phone flash examined included a one of several variants of parabolic reflectors on the back side of the flash LED, designed to direct and intensify the light output in a primary direction.

                      While the camera flash based on the above would not be allowed, In discussion with the entire GDC, we reconsidered and came to the conclusion to allow the camera flash to be used to aid vision recognition (a skill we wish to encourage among teams!).

                      The prior posting will be amended with a note making sure that it is clear that the flash is allowed.

                      Good luck with your vision code!

                      Comment


                      • #12
                        Originally posted by FTC4628

                        Subject: Electromagnets

                        Are permanent electromagnets (https://apwelectromagnets.com/perman...agnets/#filter[attribute][51][120]=120) allowed under <RM01> which specifically lists magnets or disallowed under <RE17> as they are electronics not otherwise listed in the game manual?


                        Answer: While magnets are allowed by <RM01>. Electromagnets (permanent or otherwise) fall into the general "Additional Electronics" covered by <RE17> and are not allowed.

                        Comment


                        • #13
                          Originally posted by FTC8397

                          Subject: Powering LEDs from XT30 splitter

                          Question: If we power an allowed light source and allowed light control module from a Rev Expansion Hub XT30 port, via a Rev XT30 Power Distribution Block, will that comply with <RE12>d.iv. ?
                          ​​​


                          Answer: Yes

                          Comment


                          • #14
                            Originally posted by FTC7330

                            Subject: Selft-Retracting Power Cables

                            My students are interested in using a power cable that extends and retracts on a spring to bring power to a motor. For example https://www.amazon.com/gp/product/B0...4Q86RQ8BZE2R4F or https://www.amazon.com/Bayco-SL-800-...extension+cord.

                            So long as wire gauge requirements are met, would such a mechanism be legal under the 1 degree of freedom COTS rule? There is an in and out motion in addition to the rotation, but we don't see this as being different from tape measures that were ruled legal in previous seasons. Thank you for your consideration.


                            Answer: Yes. Self-retracting cables of appropriate wire gauge are allowed

                            Comment


                            • #15
                              Originally posted by FTC12676

                              Subject: REV Servo Power Module and Mixing Vex 393 motors with other servos

                              I understand for Vex 393 motor we will have to use motor controller 29 and Rev Servo power module and there is a limitation of 2 Vex 393 per Servo power module. We are using only one Vex 393 motor so can we still use other port for 2 servos like Hitech or Rev smart servo?


                              Answer: Yes. But keep in mind that the Vex 393 motor consumes 1/2 of the power budget for the Servo Power Module. Other servos powered from the Servo Power Module need to be sized appropriately to ensure that the overall power budget for the module is not exceeded.

                              Comment

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