No Robot Code [Pathfinding]



After deploying, when I enable autonomous, the console says “No Robot Code”. Here’s literally all that I wrote (copied directly from wpilib’s article on pathweaver and motion planning:

package frc.robot;

import edu.wpi.first.wpilibj.ADXRS450_Gyro;
import edu.wpi.first.wpilibj.Encoder;
import edu.wpi.first.wpilibj.Notifier;
import edu.wpi.first.wpilibj.SPI;
import edu.wpi.first.wpilibj.Spark;
import edu.wpi.first.wpilibj.SpeedController;
import edu.wpi.first.wpilibj.TimedRobot;
import jaci.pathfinder.Pathfinder;
import jaci.pathfinder.PathfinderFRC;
import jaci.pathfinder.Trajectory;
import jaci.pathfinder.followers.EncoderFollower;
public class Robot extends TimedRobot {
private static final int k_ticks_per_rev = 20;
private static final double k_wheel_diameter = 0.558;
private static final double k_max_velocity = 0.3;

private static final int k_left_channel = 0;
private static final int k_right_channel = 2;

private static final int k_left_encoder_port_a = 0;
private static final int k_left_encoder_port_b = 1;
private static final int k_right_encoder_port_a = 2;
private static final int k_right_encoder_port_b = 3;

private static final String k_path_name = “example”;
private SpeedController m_left_motor;
private SpeedController m_right_motor;

private Encoder m_left_encoder;
private Encoder m_right_encoder;

// private AnalogGyro m_gyro;
private ADXRS450_Gyro m_gyro;

private EncoderFollower m_left_follower;
private EncoderFollower m_right_follower;

private Notifier m_follower_notifier;
public void robotInit() {
m_left_motor = new Spark(k_left_channel);
m_right_motor = new Spark(k_right_channel);
m_left_encoder = new Encoder(k_left_encoder_port_a, k_left_encoder_port_b);
m_right_encoder = new Encoder(k_right_encoder_port_a, k_right_encoder_port_b);
m_gyro = new ADXRS450_Gyro(SPI.Port.kOnboardCS0);
public void autonomousInit() {
Trajectory left_trajectory = PathfinderFRC.getTrajectory(k_path_name + “.left”);
Trajectory right_trajectory = PathfinderFRC.getTrajectory(k_path_name + “.right”);

m_left_follower = new EncoderFollower(left_trajectory);
m_right_follower = new EncoderFollower(right_trajectory);

m_left_follower.configureEncoder(m_left_encoder.get(), k_ticks_per_rev, k_wheel_diameter);
// You must tune the PID values on the following line!
m_left_follower.configurePIDVA(1.0, 0.0, 0.0, 1 / k_max_velocity, 0);

m_right_follower.configureEncoder(m_right_encoder.get(), k_ticks_per_rev, k_wheel_diameter);
// You must tune the PID values on the following line!
m_right_follower.configurePIDVA(1.0, 0.0, 0.0, 1 / k_max_velocity, 0);

m_follower_notifier = new Notifier(this::followPath);

private void followPath() {
if (m_left_follower.isFinished() || m_right_follower.isFinished()) {
} else {
double left_speed = m_left_follower.calculate(m_left_encoder.get());
double right_speed = m_right_follower.calculate(m_right_encoder.get());
double heading = m_gyro.getAngle();
double desired_heading = Pathfinder.r2d(m_left_follower.getHeading());
double heading_difference = Pathfinder.boundHalfDegrees(desired_heading - heading);
double turn = 0.8 * (-1.0/80.0) * heading_difference;
m_left_motor.set(left_speed + turn);
m_right_motor.set(right_speed - turn);


  • This function is called periodically during autonomous.
    public void autonomousPeriodic() {
    public void teleopInit() {


What am I missing?


Most likely your robot code is crashing here because those files are not present on the robot. Currently Pathfinder crashes if the files don’t exist. Files can be put into src/main/deploy to be copied to the robot during deployment.


Thanks, that fixed the problem.
Maybe I should make another thread, but now, the robot randomly disconnects. “Loop time of 0.02s overrun” is apparently the problem? How should I fix this?


Loop time overrun is just a warning. What do you mean it by “it randomly disconnects”? Disconnect = what behavior on DS etc?