By ArenaBots · Last reviewed
| Format | Main focus | Check before committing |
|---|---|---|
| Line following | Reading a track and adjusting the robot’s movement | Track specification, sensing conditions and autonomous-control rules |
| Robot sumo | Finding an opponent and pushing it out of a ring | Control category, ring specification, size and mass limits |
| Robot combat | A head-to-head contest under an organiser’s combat rules | Permitted designs, inspection, suitable containment and supervised testing access |
Choose the learning goal before the shopping list
A first robotics project is easier to plan when you know what you want to practise: sensing and programming, mechanical design, driving, or preparing a team for a particular competition. Choose a task that fits the time, tools and help actually available to you.
Line following, robot sumo and robot combat are different project directions, not interchangeable rule sets. This guide compares the formats; it does not claim that a particular competition is currently open in Sri Lanka. Start with a reviewed event and its current rules if your goal is to enter a competition.
Line following: practise sensing and control
A line-following robot uses information about a marked track to adjust its movement. Reflectance sensors are one approach: Pololu’s QTR documentation, for example, describes reading sensor values, calibration and estimating a line’s position. That is a manufacturer example rather than a required brand or a complete competition design.
Consider this direction if you want to work through repeated software and sensing tests. Before buying hardware, find out what track surface, line appearance and course conditions you will need to handle. Read the documentation for your exact sensor and controller, and check whether an event permits the control approach you intend to use.
Robot sumo: practise sensing, movement and strategy
Robot sumo centres on two robots competing to push an opponent out of a ring. The All Japan Robot-Sumo Tournament distinguishes autonomous and radio-controlled categories. Other organisers may use different classes and restrictions, so the word ‘sumo’ alone does not tell you how your robot may be controlled.
Check the ring, size and mass requirements before choosing a chassis or drivetrain. Ask how starting, stopping and judging work for the actual category. Consider whether you have a suitable practice space and a way to evaluate the behaviour you are programming or driving. Do not assume that a robot built for one sumo rulebook can enter another without changes.
Robot combat: plan the venue and support first
Robot combat involves head-to-head matches under specific design, inspection and judging rules. NHRL is one international example: its rules describe enclosed competition and safety requirements. It is not the rulebook for every Sri Lankan event, and a photograph of a combat robot does not establish that a design is permitted.
Before committing to this direction, confirm access to the organiser’s required containment, experienced supervision and approved testing arrangements. Discuss a proposed design with the organiser before purchasing parts. This comparison is not a weapon-building or testing guide; follow the actual event’s safety process and inspection requirements.
Compare the whole project, not just the advertised kit
Make a short plan for each option you are considering. Include the components you already own, parts still needed, tools, documentation, practice space, transport and any confirmed entry fee. Get current prices and availability from real sellers; there is no universal budget or build time for these formats.
Write down the first behaviour you want to demonstrate and how you will check it using the relevant documentation and a suitable environment. If your plan depends on equipment or support you do not yet have, resolve that gap before treating a parts list as a complete project. You can start with a workshop or a simpler learning task while preparing for a later competition.
- Which specific task do you want the robot to perform?
- Which current event rules, if any, are you building to?
- What tools, test space and experienced help are available?
- Which exact components are compatible and actually available?
- How will you document your progress and check the next change?
Sources and further reading
- Pololu QTRSensors documentation
Manufacturer documentation for a reflectance-sensing example. Use the documentation matching your own hardware and library version.
- All Japan Robot-Sumo Tournament rules
An organiser’s primary description of sumo formats and rules, in Japanese. It does not establish the rules for a Sri Lankan competition.
- NHRL rules and regulations
An international combat organiser’s rules and safety overview. Confirm your own organiser’s current requirements.
Continue learning
Your next move
Find reviewed robotics events in Sri Lanka, browse robotics parts from community sellers, or read another beginner guide. Organisers can submit an event for review.
This is general planning guidance. Confirm event requirements with the organiser and component specifications with the manufacturer. Contact a seller directly about an individual listing.