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Robot Inspection and Build Rules - Electrical - Answer Thread

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  • Luke Skywalker
    replied
    Mirror

    Originally posted by FTC6832
    Rule RE06.a is about light emitted from the robot. It says mirrors cannot be used to direct that light. We want to confirm that directing incoming light IS allowed. As an example - a periscope for the cameras on the phone would be allowed.
    A: Yes, it is legal to use a mirror to redirect incoming light.

    Leave a comment:


  • Han Solo
    replied
    Pixy Camera Module?

    Originally posted by FTC7593
    -it communicates via I2C
    -it can be powered via USB
    see http://www.cmucam.org/projects/cmucam5/wiki for description
    (I will have to check whether it can be powered within the power limits permitted).
    While it does have an on-board microprocessor, so does the NavX; neither can be programmed while it is in the robot.
    Thanks!
    Martin Haeberli
    Mentor, FTC 7593, TigerBots


    A: No. Sensors may only be powered by the Core Device Interface or the Core Legacy Module (per <RE05> and <RE06>)

    Leave a comment:


  • Han Solo
    replied
    IR Remote for LEDs on Robot

    Originally posted by FTC8477
    Can we mount these lights and the remote to the robot and turn the lights on with it's remote control prior to the match starting? Meaning we will not touch the light's remote during the match and it will stay mounted on the robot.

    http://www.eachbuyer.com/croled-5m-5...EGYaAt8U8P8HAQ

    Thanks,

    Linda


    A: No. The LED's alone would be legal, but the controller module is not allowed per <RE06>.d. Additionally, <T4> prohibits all forms of wireless communication with the robot other than Wi-Fi Direct

    Leave a comment:


  • Han Solo
    replied
    NXT Cable Extension

    Originally posted by FTC7342
    Can we extend the black wire that connects the legacy module to tetrix motor controllers?


    A: NXT cables beyond the .9m length are not recommended by either Modern Robotics or LEGO. The I2C signaling done over the wires is not reliable at longer lengths.

    Leave a comment:


  • Han Solo
    replied
    Robot Controller USB Cabling Options

    Originally posted by FTC5916
    Currently we use the Modern Robotics-supplied USB On-The-Go male to USB micro male cable to connect our on-robot phone to the core power distribution module. May we replace that single cable with following two cables strung together?
    1) a USB On-The-Go to USB full-sized male cable connected to 2) a USB full-sized female to USB micro male cable.

    We have had dead-robot disconnection problems at our first qualifier. The above would allow us to reduce the repetitions of plug and unplug cables into the phone and/or the power distribution module, potentially reducing wear and tear on those parts. More of the wear and tear would happen in plugging and unplugging the full-sized connectors in the middle of the double cable, which might be more durable or more easily replaced than the phone or the CPDM.

    Thank you!
    A: This is explicitly allowed by <RE05>.c "Either a Mini USB OTG (On-The-Go) Micro Cable or a Mini USB adapter and OTG (On-The-Go) Micro Cable is used to connect the Robot Controller Android device ..."

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  • Han Solo
    replied
    Is Core Power Distribution Module Required?

    Originally posted by FTC3737
    Hello! We have been having USB problems with our CPDM interfacing with the phone and detecting controllers. To have a running robot, we switched out the CPMD for the Legacy Module, and daisy chained HiTechnic Motor and Servo Controllers to the battery with a switch. This configuration works perfectly. Would a configuration with a Legacy Module be legal if we cannot run our system via the CPMD?

    Thanks,
    FTC3737


    A: No. This is not a legal configuration. Per <RE01>.b the Robot Controller USB connection must be to a CPDM. <RE03>.d requires that all powered modules be connected to the output ports of the CPDM.

    Leave a comment:


  • Han Solo
    replied
    Removing Encoder From AndyMark Motor

    Originally posted by FTC0247
    Hello,

    Under rule RE02, is removing the encoder from an otherwise legal Andymark motor such as AM2964A a legal modification?

    We have a mechanism that is space constrained and we don't need the encoder, removing it makes the motor smaller. This does not impact safety and makes the motor "more usable" in this situation, so I'm hoping you say this is legal under RE02.

    Thanks!


    A: Yes. This is allowed. Be prepared to explain the modification to the robot inspectors

    Leave a comment:


  • Han Solo
    replied
    Laser Pointer Alignment Device

    Originally posted by FTC9908
    Can the kids use a small laser pointer to align the robot during during autonomous? We are looking to start at an angle to get to the Beacon repair zone. They would turn it off after setup and before they start the program.

    Please let us know.

    Team 9908


    A: No. <G4> requires alignment devices to be made from legal components and to stay completely within the 18" cube starting configuration. Per <RE06>.a explicitly disallows focused light sources (including lasers).

    Leave a comment:


  • Han Solo
    replied
    Additional Electronics

    Originally posted by FTC4592
    I.
    Per <RE06>d, "Other electronics are not allowed." However, we are using ours as a form of manufactured sensor, which would be allowed under <RE06>b.i, where our Arduino is exclusively used for sensor purposes and is only connected to another sensor and the Core Device Interface Module.

    If the Arduino would not be considered a manufactured sensor, why? It is not exclusively allowed or disallowed in the rules, and we used ours to great advantage last year through the HiTechnic SuperPro board. There seems to be no reason that the rules should have changed in this matter, since so many teams used this last year.

    A comment earlier referenced that communication with an Arduino would require additional drivers, which may be an argument against it. However I already have a working prototype for communication with said Arduino through the I2C bus of the Core Device Interface Module, so it is definitely compatible for this year's game with a little work by the team, making the argument invalid.

    II.
    Is there any way to use 3.3v sensors with the Core Device Interface Module? Currently, my team only has access to 3.3v versions of the sensors that we require, however under <RE03>h, "External power adapters or voltage converters are not allowed." It would be cost prohibitive to buy new sensors when we already have the 3.3v sensors and voltage converters that are required for communication over I2C to the Core Device Interface Module.
    A1: Arduino systems are not allowed per FTC Q&A Electronics Forum post #2 and post #18 (answers A3 & A4)

    A2: We are not in a position to recommend solutions for this type of question. <RE05>.e.iii requires all power for allowed sensors to come directly from either the Core Device Interface or the Core Legacy Module.

    Leave a comment:


  • Han Solo
    replied
    Recording Data on Robot Controller Android Device

    Originally posted by FTC7026
    During the autonomous period of our last meet, our robot had made an unexpected turn. This lead us to wonder if we are allowed to store our telemetry data during the match in order to review it afterwards. Are we allowed to store this data on the phone during the match? This will help us analyze our autonomous and to better understand why it makes certain decisions during a match.


    A: There is nothing in the rules that prohibits the recording of data during a match on the Robot Controller Android Device.

    Leave a comment:


  • Han Solo
    replied
    Bypass Core Power Distribution Module USB Hub?

    Originally posted by FTC10299
    As we continue to test our robot, we have found that the USB hub inside the Core Power Distribution module is very unreliable. We tried to get around this by using the USB hub usually connected to the driver phone to connect the game pads in the place of the core power distribution module. The CPDM is still being used to distribute power from the battery to the modules. Is it legal to use this USB hub in place of the Core Power Distribution Module?


    A: No. Per <RE01>.b, the Robot Controller Android device USB interface may only connect to the Core Power Distribution Module. Standalone USB hubs are allowed, but only as connected to the USB hub ports on the Core Power Distribution Module (i.e. not directly to the Robot Controller Android Device)

    Leave a comment:


  • Han Solo
    replied
    3rd Party Robot Code

    Originally posted by FTC10182
    Is it legal to use 3rd party libraries when programming our app? I'm thinking specifically of using OpenCV. But I'd like the general answer as well. Does it matter whether the 3rd party library is open source or not?


    A: There is nothing in the rules that prohibits the used of 3rd party code/libraries.

    Leave a comment:


  • Han Solo
    replied
    External Battery for Video Camera Not Allowed

    Originally posted by FTC5559
    Can we use an external battery bank for the purpose of charging only a camera for non-functional post match entertainment?


    A: No. Per <RE03>.f (internal, manufacturer supplied battery only)

    Leave a comment:


  • Han Solo
    replied
    I2C Multiplexer Allowed?

    Originally posted by FTC4997
    Hi,

    We wanted to use multiple Adafruit RGB Sensors on our robot. However, since they have a fixed I2C address, and each DIM only has a single I2C bus, a separate DIM would be required for each sensor, which is unreasonable and not feasible. We were wondering if the following I2C multiplexer would be allowed, so that multiple RGB sensors could be on one DIM: https://www.adafruit.com/products/2717 This thread has some more information: http://ftcforum.usfirst.org/showthre...it-RGB-Sensors

    Thanks!


    A: Yes. Simple I2C multiplexers, such as the one referenced, are allowed. They may only be connected to and powered from the I2C connections available on the Core Device Interface Module.

    Leave a comment:


  • Han Solo
    replied
    Main Power Switch Requirements

    Originally posted by FTC0365
    We just had a quick question about the wiring of our robot -- We know that the Core Power Distribution Module has its own Power Switch on one side. Are we allowed to wire an external switch, such as the ones used last year, between the Battery and Power Distribution Module? We would then use this switch to turn the robot on and off, while the one built into the module stays permanently on. In our current electrical setup, the Power Distribution Module is not easily accessible, and that switch would not be easily turned off for an emergency power shut down on the field.

    Thanks!
    --
    MOE 365 FTC


    A: Yes. A separate Main Power Switch is strongly recommended. This is covered in <RG04>

    Leave a comment:

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