Competition robotics challenges students to design, build, program, and drive robots that complete game tasks under time limits. FRC, VEX, and FLL each use different robot sizes, tools, and rules, but they all reward teamwork, engineering design, and clear problem solving. This cheat sheet helps students organize the major ideas needed before, during, and after a robotics season.
It is useful for quick review in the shop, classroom, pit, or competition venue.
The most important skills are understanding the game, choosing a simple strategy, building reliable mechanisms, writing tested code, and documenting decisions. Strong teams use an engineering design cycle: define the problem, brainstorm, prototype, test, improve, and communicate. Match success often depends on consistency more than complexity.
A robot that performs one or two important tasks reliably is usually better than a robot that attempts many tasks poorly.
Key Facts
- The engineering design cycle is: identify the problem, brainstorm solutions, prototype, test, improve, and share results.
- A good robot strategy starts with scoring value per time, calculated as points per cycle = points scored in one trip or action divided by time for that cycle.
- Reliability matters because expected match contribution = average points scored x success rate.
- For drivetrains, speed and pushing force trade off because higher gear ratios usually increase torque while lower gear ratios usually increase speed.
- In autonomous programming, sensors improve accuracy by giving feedback such as distance, angle, color, line position, or object detection.
- A simple PID idea is error = target value - measured value, and the robot adjusts motor output to reduce that error.
- Before competition, every robot should pass a checklist for battery charge, loose wires, legal size, legal parts, firmware, code version, and safety inspection.
- Strong drive team communication uses short role-based calls such as driver, operator, coach, human player, and technician.
Vocabulary
- FRC
- FIRST Robotics Competition is a high school robotics program using large custom robots, yearly games, alliances, and an intense build and competition season.
- VEX
- VEX Robotics is a competition system where teams build medium-sized robots from reusable parts to complete yearly game challenges.
- FLL
- FIRST LEGO League is a robotics program where students use LEGO-based robots, coding, research, and teamwork to solve themed challenges.
- Autonomous
- Autonomous means the robot acts from prewritten code without direct driver control for part or all of a match.
- Drivetrain
- The drivetrain is the system of motors, wheels, gears, belts, chains, or tracks that moves the robot around the field.
- Prototype
- A prototype is a quick test version of a mechanism or idea built to learn whether it works before making the final design.
Common Mistakes to Avoid
- Trying to do every game task, which is wrong because a complicated robot often becomes unreliable and hard to finish before competition.
- Ignoring the rulebook, which is wrong because illegal dimensions, parts, mechanisms, or match actions can fail inspection or earn penalties.
- Testing only when the robot is finished, which is wrong because early testing finds design, wiring, and programming problems while they are still easy to fix.
- Changing code or hardware at competition without recording it, which is wrong because the team may not know what caused a new problem or how to undo it.
- Designing without drivers and pit crew in mind, which is wrong because a robot must be easy to control, repair, carry, charge, and inspect under time pressure.
Practice Questions
- 1 A robot scores 12 points in a 20-second cycle. What is its points per second, and how many points would it average in 100 seconds at that same rate?
- 2 A mechanism succeeds 8 times out of 10 and scores 15 points each time it works. What is its expected point value per attempt?
- 3 During testing, an autonomous routine drives 60 cm when the target is 75 cm. What is the distance error using error = target value - measured value?
- 4 A team can build either a simple robot that scores one task very reliably or a complex robot that attempts three tasks but often breaks. Explain which choice is usually stronger for competition and why.