Telemetry Demo

Introduction: Telemetry is how your robot sends live information to the Driver Station during a match.

Basic theory: In LinearOpMode, you usually add telemetry data inside the active loop and call telemetry.update() once each cycle so the latest values appear on screen.

import com.qualcomm.robotcore.eventloop.opmode.LinearOpMode;
        import com.qualcomm.robotcore.eventloop.opmode.TeleOp;
        
        /**
         * This OpMode demonstrates the basic use of Telemetry in FTC.
         * Telemetry is used to send information from the robot to the Driver Hub,
         * which is essential for debugging and providing feedback to drivers.
         */
        @TeleOp(name="Telemetry Demo", group="Training")
        public class TelemetryDemo extends LinearOpMode {
        
            @Override
            public void runOpMode() {
                // --- Initialization Phase ---
                // This code runs when the driver presses the "INIT" button.
        
                // .addData(caption, value) prepares a line of text to be sent.
                // It does NOT send it immediately.
                telemetry.addData("Status", "Waiting for start");
                
                // .update() sends all prepared data to the Driver Hub.
                // Without this call, the driver won't see anything new.
                telemetry.update();
        
                // Pause and wait for the driver to press the "PLAY" button.
                waitForStart();
        
                // --- Run Phase ---
                // This code runs in a loop after the "PLAY" button is pressed.
                while (opModeIsActive()) {
                    
                    // Send the total time since the OpMode started.
                    // This is useful for checking if the robot is "frozen" or lagging.
                    telemetry.addData("Runtime", "%.2f seconds", getRuntime());
                    
                    // You can add multiple lines of data before calling update.
                    telemetry.addLine("Robot is actively running!");
                    
                    // Finalize and send the data for this loop iteration.
                    telemetry.update();
                }
            }
        }