Section 8: Writing Your First FTC OpMode

In Android Studio, your robot code belongs in:

TeamCode/src/main/java/org/firstinspires/ftc/teamcode/

Right-click this folder, select New → Java Class, and name it DiagnosticOpMode.

In OnBot Java, create a new OpMode from the browser editor and use the same class body. OnBot Java manages the package and project location for you.

Replace the generated content with the following. This is the minimum valid OpMode that proves your environment is working:

package org.firstinspires.ftc.teamcode;

import com.qualcomm.robotcore.eventloop.opmode.TeleOp;
import com.qualcomm.robotcore.eventloop.opmode.OpMode;

@TeleOp(name = "Diagnostic", group = "Setup")
public class DiagnosticOpMode extends OpMode {

    @Override
    public void init() {
        telemetry.addData("Build", "Successful");
        telemetry.addData("Status", "Ready");
    }

    @Override
    public void loop() {
        telemetry.addData("Runtime", getRuntime());
    }
}

In Android Studio, press the green Build button. You should see BUILD SUCCESSFUL in the Build panel.

In OnBot Java, select Build Everything and wait for a successful build message.

Telemark's browser simulator can run the lesson examples without either build step. A successful Android Studio or OnBot Java build confirms that your code can move on to physical Robot Controller testing.

Ready to move on?