Botopsy Lab

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Botopsy Lab

Diagnostic training for engineers who need to restore real robot systems, not repeat expected outputs.

BUILD / BREAK / DIAGNOSE / FIX

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First repair is public

Find the frame fault.

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Interactive playground

Differential Drive Sandbox

Convert wheel velocities into robot motion, encoder ticks, and odometry estimates.

Wheel radius0.08Wheel separation0.42Left wheel velocity6Right wheel velocity7Encoder resolution2048Simulation duration6Time step0.10

Fault togglesLeft encoder reversedWrong wheel radiusWrong wheel separationEncoder overflowInteger division bug

Odometry x2.74 m

Odometry y1.29 m

Heading49.6 deg

ROS connection

This browser experiment is local only. It mirrors ROS concepts but is not connected to a live ROS graph.

linear velocity: 0.520 m/s
angular velocity: 0.144 rad/s
left ticks: 11734
right ticks: 13690

Challenge

The robot drives straight physically but the odometry curves left.

Select the likely root causeThe left encoder direction is reversedBoth wheel radii are equally smallThe simulation time step is shorter