RoboRIO Robot Control

1. The lead programmer on your team has requested a power supply for the roboRIO so they can try deploying the code. What are the voltage requirements for the roboRIO?

Between 7 V and 16 V

Between 7 V and 26 V

Between 1 V and 16 V

Between 20 V and 26 V

2. You are ready to test your robot! Once the robot is connected to the computer, you see the following in the FRC Driver Station:

What do you need to do before you will be able to drive your robot?

Plug in at least one joystick.

Download robot code to the roboRIO.

Connect at least one motor to the roboRIO.

Update the firmware on the roboRIO.

3. You read in the User Manual that the roboRIO operates normally at 12 V, and you want to check that your battery has enough charge. Where could you go to find the voltage of the battery currently connected to the robot?

Driver Station

Robot Main.vi

Dashboard

RoboRIO Imaging Tool

4. You want to update your roboRIO before your team begins programming for this year's competition. What tool do you use?

RoboRIO Imaging Tool

FRC Driver Station

Setup Axis Camera tool

FRC Dashboard

5. Over what connections should you deploy code to the roboRIO at a competitive event?

USB or Ethernet

Ethernet or Wi-Fi radio

USB or Wi-Fi radio

USB, Ethernet, or Wi-Fi radio

6. You need to image your roboRIO. You connect it to your computer via which port?

USB because the connection is most stable

Ethernet because the connection is fastest

DIO for the most direct connection

Analog In because this is how the roboRIO receives new information

7. A teammate suggests securing the power wires to the roboRIO by soldering directly to the pins. Which of the following is the best explanation for why this is a bad idea?

The soldering process might damage the roboRIO.

Solder provides a less reliable connection than screw terminals.

Solder has too much electrical resistance.

Solder has too much electrical inductance.

8. After losing connection to your robot, you check the logs and see that your voltage typically hovered between 8-9 V. When it dropped down to 7 V, the logs show a disconnection. What most likely caused the disconnection?

A brownout occurred, and the roboRIO entered its protection state.

The Ethernet cable between the roboRIO and the Robot Radio became disconnected.

The power supply to the roboRIO became disconnected.

The entire robot was turned off by a collision with another robot tripping the breaker.

9. What is the best method to ensure the power supply does not disconnect from the roboRIO during a match?

Secure it with the screw terminals on the connector.

Hot glue the wires directly to the power port.

Tape over the connector once it's plugged into the roboRIO.

Solder the wires directly to the power port.

10. Your motor controller has a green wire and a yellow wire coming out of it. What bus would you use to communicate with this device?

CAN

PWM

DIO

ANALOG IN

11. Where can you review robot diagnostics recorded during a previous match or practice run?

In the FRC Driver Station, click the gear above the console and then select View Log File.

In the LabVIEW project, right click the roboRIO and then select View Diagnostics.

In the roboRIO Web Interface, click the View Log File button.

In the roboRIO Imaging Tool, click Transfer Log Files.

12. You have started a roboRIO firmware update and realize you chose the wrong version. Which of the following decisions should you make?

Let it complete the update, and then start the process over.

Quickly power down the roboRIO to avoid causing harm with a bad firmware version.

Hit the RESET button to start over.

Disconnect the USB to avoid sending any more of the firmware to the roboRIO.

13. You turn on your roboRIO and the robot does not start its program. You notice that the STATUS LED is blinking in patterns of 3. How can you correct this?

Reboot the roboRIO to exit safe mode.

Vacuum out the ports to clear the short.

Set the correct run mode in your Driver Station.

Disconnect some of your PWM lines because they are overloaded.

14. What communication protocol is used to communicate between the roboRIO and the PDP?

CAN

SPI

I2C

USB

15. Which is the first step in connecting a motor to your roboRIO?

Disconnect the battery.

Secure all motors to a board.

Connect the red terminal on the motor to the red terminal on the PDP.

Connect the wires through wire nuts until you are finished testing.

16. You want to connect a sensor to a DIO port on the roboRIO. What voltage(s) can the DIO rail accept from the sensor?

3.3 V or 5 V

3.3 V only

5 V or 15 V

1.8 V or 3.3 V

17. My robot lost communication during the previous match, and I don't know why. What is the first step to debugging the issue?

Investigate the logs from the FRC Driver Station.

Immediately replace the battery in the robot.

Ask the FTA why your robot lost communication.

Check the wiring on your robot.

18. Your teammate has finished wiring the power connections to the control system from the PDP. Now you should connect the PDP to what on the roboRIO?

CAN port

USB port

Analog input terminal

Digital output terminal

19. You open your FRC Driver Station to test your robot, and you see the following message:

What should you do to resolve this error?

Disable all firewalls.

Enable only the Public firewall.

Enable all firewalls.

Disable only the Public firewall.

20. You have connected the PDP to the roboRIO via CAN wires, and you want to update the PDPâ€™s firmware. What utility would you use?

RoboRIO Web Interface

RoboRIO Imaging Tool

FRC Driver Station

FRC Dashboard

21. Your autonomous code is ready to test! How do you start the autonomous mode from the FRC Driver Station?

Select Autonomous from the Operation tab before enabling the robot.

Click the Autonomous check box from the Setup tab after enabling the robot.

Autonomous mode is always called when the robot is enabled.

Change the Team Station to Autonomous in the Operation tab before enabling the robot.

22. How often should batteries be charged at competition?

Between each match

After every other match

Once per day

When the battery drops below 20% of it's capacity

23. You're wiring a connection to PWM Port 3. While you're doing this, the POWER LED turns red. What may have caused this?

You caused a shorted connection on the PWM power rail.

The POWER LED briefly turns red to indicate you added a new connection without powering off the robot.

You caused an open connection on the PWM power rail.

The roboRIO doesn't expect a connection on this port.

24. You added a CAN motor controller to your robot, but the motor is not responding to the joystick. You should check that the motor controller is connected to what?

PDP and the CAN port on the roboRIO

DIO port and PWM port on the roboRIO

PWM port and CAN port on the roboRIO

PDP and the RS-232 port on the roboRIO

25. You are imaging your roboRIO, and it doesn't look like the progress bar is moving. What should you do?

Leave the roboRIO alone and wait for the process to complete.

Unplug and replug the roboRIO's connection from the computer.

Unplug and replug the roboRIO's power to reboot the device.

Restart the imaging process to reset the connection.

26. You're using a Spark motor controller and the tri-state STATUS LED is flashing equal time for green and off. In what location would you expect the joystick to be?

Halfway forward

Halfway backward

Completely forward

Completely backward

27. You want to connect four PWM motor controllers to your roboRIO. Which is the best selection of PWM ports to control the Front Left, Rear Left, Front Right, and Rear Right motors, respectively?

0, 1, 2, 3

0, 2, 3, 6

2, 1, 0, 3

5, 7, 2, 9

28. Your FRC Driver Station shows you have a fault on one of the power rails.

Which voltage rail should you start troubleshooting?

PWM

DIO

MXP

RSL

29. When you view the Log File Viewer, you see several dark orange circles near the top of the display. What does each dot represent?

An important event occurred, which is detailed in the Events log.

The various stages of a match started, which is detailed in the Match log.

An image was received from the roboRIO's camera, which is visible by mousing over the orange dot.

A new PWM connection was detected, which is detailed in the Events log.

30. If you connect your roboRIO to your computer via USB and want to bring up the Web Interface, what IP address would you use?

172.22.11.2

169.254.188.21

10.TE.AM.2, where TEAM is your team number

192.168.34.2

31. You supply power to your roboRIO and now the POWER LED is flashing red. Which of the following voltage levels would cause this problem?

18 V

8 V

12 V

14 V

32. What topology should you use for your CAN network?

Daisy chain from roboRIO to CAN devices to PDP

Spoke-and-wheel with roboRIO as the center

Spoke-and-wheel with the PDP as the center

Daisy chain from PDP to roboRIO to CAN devices

33. You want to be able to use the Web Interface regardless of whether you're connected via Ethernet or USB. What should you enter into the web browser to accomplish this? (Note: in the answers below, the letters T-E-A-M represent the 4 digits of your FRC team number. If your team number has less than 4 digits, it is preceded by zeros. Team 456 = 0456, for example.)

RoboRIO-TEAM-frc.local

RoboRIO-TEAM.local

172.22.11.2-TEAM

10.TE.AM.2

34. Youâ€™re attempting to test your motor connections with your Talon SRX motor controller.â€¯ The motor isnâ€™t responding to the joystick, and the status LED on the motor controller is blinking orange.â€¯ Which of the following could be the issue?

The motor controller is disabled.

The motor controller isnâ€™t receiving enough voltage to control the motor.

The motor controller isn't connected to a motor.

You have the wrong fuse in the motor controller's power line on the PDP.

35. Where can you look to determine the maximum voltage on the PWM power rail?

Printed on the roboRIO or in the roboRIO User Manual

Only in the roboRIO User Manual

Only in the FRC Driver Station

Printed on the roboRIO or in the FRC Driver Station

36. After a match, your FRC Driver Station's log's event list shows you lost communication with the roboRIO but that you never lost connection with the Robot Radio. What connection is most likely the cause of the error?

The Ethernet cable between the roboRIO and the Robot Radio became disconnected.

The Robot Radio lost power.

The USB cable between the roboRIO and the camera became disconnected.

The robot experienced a brownout due to the battery being too low on voltage.

37. You've used all of your PWM ports. You want to plug your PWM motor controller into one of the digital ports, since the connections appear identical. Why will this not work?

PWM motors require a pulse to operate.

The DIO ports can only output 3.3 V which is too low to run the motor controllers.

The source current of the DIO ports are too low to drive the motor controllers.

The PWM ports provide power, and the DIO ports do not.

38. You want to add a CAN motor controller to your robot. What order should these devices on the CAN network be connected?

RoboRIO > CAN motor controller > PDP

PDP > roboRIO > CAN motor controller

CAN motor controller > PDP > roboRIO

CAN motor controller > roboRIO > PDP

39. Your FRC Driver Station measures your battery at 11 V. Is this a battery a good choice for your next match?

No. During operation, voltage will drop and the roboRIO is likely to brownout.

No. The roboRIO requires 12 V and 11 V isn't sufficient to provide power.

Yes. It is within the voltage requirements to power the roboRIO.

Yes. Voltage higher than 11 V is likely to cause damage to the roboRIO.

40. My robot has an arm that stops working intermittently during a match, but my drive base keeps working. What is the first step I should take in debugging this behavior?

Check the wiring on the arm subsystem.

Replace the current battery with a fully charged one.

Investigate the logs in the FRC Driver Station.

Replace the fuses for the arm on the PDP.

41. You check the FRC Driver Station to verify your PDP Firmware version. The PDP is not listed in the versions. What is the most likely cause of this?

The CAN connection is wired incorrectly.

The PWM connection is wired incorrectly

The PDP requires several minutes to warm up before displaying its firmware version.

The PDP doesn't require firmware so this never shows up.

42. Your robot is browning out when trying to accelerate to maximum speed from a stopped position. Which change could you make to both reduce the brownouts and maintain your desired functionality?

Have your programmer add ramping to your motors in software.

Add another motor to redistribute the load.

Remove a motor to reduce the current needed.

Have your programmer specify the battery voltage usage in software.

43. Your Autonomous and TeleOperated code work as expected when tested independently. However, there always seems to be problems on the field after transitioning from Autonomous to TeleOperated. To troubleshoot, what can you do in the FRC Driver Station before enabling your robot?

Click "Practice" in the Operation tab

Click the "Field Test" checkbox in the Setup tab

Click "Test" in the Operation tab

Select both "TeleOperated" and "Autonomous" in the Operation Tab

44. You connect your roboRIO to your laptop via an Ethernet cable. What behavior do you expect the link lights (the lights on the roboRIO's Ethernet port) to display?

A rapidly flashing orange light and a steady green light

A steady orange light and a steady green light

A steady orange light and rapidly flashing green light

A rapidly flashing orange light and a rapidly flashing green light

45. Your robot temporarily lost connection after a collision. To save time in troubleshooting, which part should you inspect first?

Wiring

Drive train

Radio

PDP

46. You want to test your digital connections, so you have your programmer send a True value to DIO port 0. What value would you expect to read with a Digital Multimeter (DMM)?

3.3 V

0 V

12 V

5 V

47. You are measuring the voltage output for a digital connection on the MXP. What value would you expect to read with a digital multimeter (DMM) for a high reading?

3.3 V

5 V

6 V

12 V

48. You're using a Talon motor controller to perform a test. You move the joystick all the way forward. The LED light shows solid red. What does this mean?

The motor controller is wired backwards.

The motor controller has received an error and will not operate.

The motor controller is receiving a signal, and everything is working.

The motor is operating at maximum capacity.

49. The firmware on your roboRIO is not up to date for competition. What tool should you use to update the firmware?

RoboRIO Web Interface

RoboRIO Imaging Tool

FRC Dashboard

FRC Driver Station

Roborio Robot Control