Apex Combat Unit#MS-30524-R52025 Season

Razorback 500g Mini Sumo

Compact 500g autonomous ring fighter with ultra-sharp ground blades, 200kHz PWM magnetic edge-reversal algorithms, and dual high-speed ultrasonic arrays.

Arduino ProBrushless 24VN52 MagnetsUltrasonic

groupsTeam Roster emoji_eventsCompetition History

Undefeated (16-0)

Reaction Time

18ms

Push Force

9.4N

Weight

498g

Season Win Rate

88.9%

Weight Class

500 g (Mini Sumo)

Main Compute

Custom ATmega328P Board

Power Delivery

LiPo 3S 11.1V (850mAh)

Control Loop

200kHz Edge-Reflex Interrupt

Hardware Dissection

Interactive Robot Explorer

Tap any numbered hotspot to inspect subsystem specs, interface protocols, and design justifications.

Tap numbered tags 1-5 to switch component dossiersACTIVE: [1] ATmega328P Board

Subsystem 01 of 05CORE PROCESSING

Custom Reflex Controller

Model:Custom ATmega328P Board

Primary Function

Runs the 200kHz edge-reflex interrupt handler that reacts to opponent contact and ring-edge detection.

Selection Rationale

A bare ATmega328P with a hand-tuned interrupt table beats a general-purpose dev board on worst-case reaction latency.

Interface / Bus:200kHz Edge-Reflex Interrupt

5 Points Total

BOM & Component Log

Bill of Materials Directory

CONTROLQTY: 1

Custom ATmega328P Board

Part #: MS-CTRL-R5

Bare-metal reflex controller tuned for sub-20ms interrupt response.

SENSORSQTY: 2

Sharp GP2Y0A21

Part #: SHARP-GP2Y0A21

Analog IR distance sensors for opponent tracking.

MOTORSQTY: 2

Brushless 24V Gearmotor

Part #: BL-24V-GM

High-torque brushless drive pair rated for sustained push loads.

MECHANICALQTY: 1 Set

N52 Neodymium Skirt

Part #: N52-SKIRT-500

Downforce magnet array mounted along the chassis perimeter.

Engineering Corps

Engineered by MOGUL TEAM

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MEMBER

Telmuuntamir Bayanjargal

Grade 11 · Member

POWER LEAD

Azjargal Gansukh

Grade 12 · Engineering

Iterative R&D

Generational Development Timeline

Striker-1 Prototype2024

Arduino Uno · Single IR Sensor

First-generation wedge bot, proved the basic reflex-attack concept.

Razorback 500g CurrentACTIVE

Custom ATmega328P · N52 Magnets

Undefeated 16-0 season record with the current magnetic downforce and dual-IR configuration.

Sanctioned Arena Record

Competition History & Podiums

emoji_events GOLDDEC 2025

National Sumo Open

500g Autonomous

Undefeated championship run, winning every bout by ring-out within the first 8 seconds.

National Sumo Arena16-0 Record

workspace_premium BRONZEAPR 2025

All-Japan Robot-Sumo Spring Qualifier

Mini Sumo 500g Autonomous

Podium finish in Tokyo for the 500g autonomous combat classification.

Tokyo Ryogoku Kokugikan14 Wins / 2 Losses

Engineering Scientific Method

Testing & Improvement Lab Logs

LOG #2025-09-20warning

False Edge-Trigger on Dark Opponents

PROBLEM:The edge-detection ultrasonic occasionally misread a dark-colored opponent chassis as the ring boundary, triggering an unwanted retreat.

TEST:Logged ultrasonic echo timing against five different opponent chassis colors on the practice ring.

ENGINEERING CHANGE:Added a minimum echo-strength threshold that ignores readings consistent with a nearby object rather than the ring edge.

✓ RESULT: Zero false edge-triggers across 30 practice bouts.

LOG #2025-11-11warning

Wheel Spin Under Full Push Load

PROBLEM:Against heavier opponents, the drive wheels would spin in place instead of pushing through.

TEST:Bench-tested traction force with and without the magnet skirt installed using a spring-scale rig.

ENGINEERING CHANGE:Upgraded to the N52 neodymium downforce skirt, increasing effective normal force on the wheels.

✓ RESULT: Push-through success rate against max-weight opponents rose from 60% to 95%.

Visual Archives

Robot in Action & Lab Media

Click any image to view full resolution

Trophy Case

Honors Awarded to Razorback 500g

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trophy

CHAMPIONSHIP

National Sumo Open Champion

Undefeated 16-0 season, the first perfect record in club history for the 500g class.

verified

ENGINEERING AWARD

IPC Soldering Excellence Award

Recognized for the reliability of the hand-soldered power distribution harness under match stress.

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