Recent Updates

  • The Robot Preferences class is used to store values in the flash memory on the roboRIO. The values might be for remembering preferences on the robot such as calibration settings for potentiometers, PID values, etc. that you would like to change without having to rebuild the program. The values can be viewed on the SmartDashboard and read and written by the robot program.

  • Updated on: Mar 24, 2015

    Troubleshooting Dashboard Connectivity

    We have received a number of reports of Dashboard connectivity issues from events. This document will help explain how to recognize if the Dashboard is not connected to your robot, steps to troubleshoot this condition and a code modification you can make

  • The 2015 convention for using the Axis camera uses mDNS with the camera name set to axis-camera.local At home this works fine as there is only one camera on the network. At official events, this works fine as each team is on their own VLAN and therefore doesn't have visibility to another team's camera. At an offseason using a single network, this will cause an issue where all teams will connect to whichever team's camera "wins" and becomes "axis-camera", the other cameras will see that the name is taken and use an alternative name. This article describes how to modify the Dashboard and/or robot code to use a different mDNS name to separate the camera streams.

  • Updated on: Feb 06, 2015

    Analog inputs

    The roboRIO Analog to Digital module has a number of features not available on simpler controllers. It will automatically sample the analog channels in a round robin fashion, providing a combined sample rate of 500 ks/s (500,000 samples / second). These channels can be optionally oversampled and averaged to provide the value that is used by the program. There are raw integer and floating point voltage outputs available in addition to the averaged values. The diagram below outlines this process.

  • The default LabVIEW Dashboard utilizes Network Tables to pass values and is therefore compatible with C++ and Java robot programs. This article covers the keys and value ranges to use to work with the Dashboard.

  • Updated on: Jan 20, 2015

    FRC Java WPILib API Documentation

  • Updated on: Jan 20, 2015

    Using the Microsoft Lifecam HD-3000

    The Microsoft Lifecam HD-3000 is a USB webcam that was tested with the roboRIO as part of the Beta testing and software development effort. While other USB webcams may work with the roboRIO, this camera has been tested to be compatible with the provided software.

  • Counter objects are extremely flexible elements that can count input from either a digital input signal or an analog trigger.

  • Updated on: Jan 19, 2015

    Power Distribution Panel

    The Power Distribution Panel (PDP) for 2015 adds the capability to measure the current to each device connected to any of the circuit breaker protected 12V outputs. Having this capability offers the opportunity to use a number of algorithm requiring sensing of the torque being developed by motors without requiring additional hardware. The PDP is connected to the RoboRIO through the CAN bus and the libraries take care of managing the communications.

    Create an instance of the PowerDistributionPanel object to use it:

    PowerDistributionPanel pdp = new PowerDistributionPanel();

    Note: it is not necessary to create a PowerDistributionPanel object unless you need to read values from it. The board will work and supply power on all the channels even if the object is never created.

  • Often you might write a command that has an "isFinished" condition that is based on a sensor reaching a particular value or a switch closing. For example, a command might rotate a robot 45 degrees by turning until the heading from a gyro reaches 45. Suppose the gyro fails or a wire pulls loose. Now the gyro will always report the same heading, probably zero degrees, and the robot will keep turning for ever. One way of making your commands more robust is to have them "time out" or quit after some time has elapsed. In the case of the turn to 45 degrees, you might know that this will always complete within 2 seconds. You could set a timeout for 3 or 4 seconds to the command will finish even if the robot never reaches the desired heading. This will allow the program to continue running rather than be stuck waiting for the roboRIO to read a heading that will never happen.