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How Hobby Robots Sense, Decide and Move
A plain explanation of the sense, think and act loop behind hobby robots, and how sensors, controllers, drivers and motors map onto each stage of it.
Build Lab
Robotics and Motion
How hobby machines sense, decide and move, with safe-operation thinking.
DC Motors, Servos and Steppers Compared
Compare DC motors, hobby servos and stepper motors on control, torque, precision and cost, with guidance on which suits wheels, joints and positioning.
Distance Sensors Compared for Obstacle Avoidance
Compare ultrasonic, infrared and optical time-of-flight distance sensors for obstacle avoidance, including their strengths, blind spots and sensible fallbacks.
Gears, Belts and Torque Trade-Offs
See how gear ratios trade speed for force, how belts and chains differ from gears, and what to weigh when choosing a drive train for a hobby robot.
How a Line Following Robot Works
Learn how a line following robot uses reflectance sensors, simple steering logic and careful tuning to track a dark line, and where beginners usually go wrong.
Inertial Sensors and How Robots Keep Their Balance
Understand accelerometers and gyroscopes, why gyro readings drift, and how filters combine the two so small robots can estimate tilt and stay upright.
Motor Drivers and Why Pins Cannot Drive Motors Directly
Learn why a microcontroller pin cannot power a motor, how current demand and back-voltage cause damage, and what an H-bridge motor driver does instead.
PID Control Explained Without Equations
Build intuition for proportional, integral and derivative correction using everyday analogies, plus a sensible approach to tuning and the problems to expect.
Planning Emergency Stops for Moving Machines
How to plan an emergency stop for a hobby robot or moving machine: cutting power reliably, avoiding software-only stops, and keeping people clear.
Robot Arms and Degrees of Freedom
Learn what degrees of freedom mean for a robot arm, how joints and link lengths set reach, and why each extra axis makes control harder for hobby builders.
Trying Robot Ideas in Simulation First
Learn how virtual testing saves hardware, time and risk when planning a robot, what simulators can check well, and where they differ from the real world.
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