Telemetry

Telemetry allows your robot to send information back to the Driver Station.

It is one of the most useful debugging tools in FTC.

You can use telemetry to view:

• Sensor values
• Motor power
• Encoder positions
• Robot states
• Variable values

addData()

addData() displays a value with a label.

telemetry.addData("Power", motorPower);

Example output:

Power: 0.75

You can display multiple values:

telemetry.addData("Left Motor", leftPower);
telemetry.addData("Right Motor", rightPower);

addLine()

addLine() displays plain text.

telemetry.addLine("Robot Ready");

update()

Telemetry does not appear immediately.

You must call update() to send the data.

telemetry.update();

Example:

telemetry.addData("Position", encoderPosition);
telemetry.update();

Debugging with Telemetry

Telemetry is useful for finding problems.

Example:

telemetry.addData("Joystick", gamepad1.left_stick_y);
telemetry.addData("Motor Power", motor.getPower());
telemetry.update();

This helps you check if:

• Inputs are being read
• Motors are receiving power
• Sensors are returning values

Displaying Robot States

Telemetry is commonly used with state machines.

telemetry.addData("State", currentState);
telemetry.update();

Example:

State: INTAKING

Key Takeaways

• Telemetry displays information on the Driver Station.
• Use addData() for values.
• Use addLine() for messages.
• Always call update().
• Telemetry is essential for debugging.