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.

No account is required for the first diagnosis.

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Interactive playground

LiDAR Index and Angle Explorer

Map LaserScan indexes to physical angles, ranges, invalid values, and rotated sensor frames.

Minimum angle-90Maximum angle90Angle increment7.50Number of samples25Selected ray index8Sensor rotation0Noise amount0.04Invalid reading percentage8

Fault togglesReverse scan orderDegrees interpreted as radiansInvalid values treated as obstaclesSensor frame rotated by 180 degrees

Index8

Angle150.0 deg

Range3.92 m

Apparent sideleft

ROS connection

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

angle_min: -90 deg
angle_max: 90 deg
angle_increment: 7.50 deg
ranges[8]: 3.92
range_min / range_max: 0.12 / 12.0
frame_id: laser

Challenge

The nearest obstacle is physically on the right but appears on the left in the costmap. Identify the likely cause.

Select the likely root causeThe sensor frame is rotated 180 degreesThe inflation radius is too smallThe LiDAR publishes too quickly