Robotics
Things that move, sense & grab. Here are all 25 working models in this field — each with a full build and working principle.
Obstacle-Avoiding Robot
An Arduino car reads distance with ultrasonic sound and steers itself away from walls.
Line-Following Robot
Infrared sensors keep a small robot glued to a black track as it races a loop.
Bristlebot
A toothbrush head, a coin motor and a battery make a buzzing bug that scurries across the table.
Hydraulic Robot Arm
Syringe-and-tube hydraulics give a cardboard arm multi-joint movement and a working gripper.
Light-Seeking Robot
Photoresistors steer a little bot toward the brightest light, like a moth to a lamp.
Servo Robotic Gripper
A single servo and a linkage make a claw that opens and closes to pick up objects.
Bluetooth-Controlled Car
Drive a robot car from your phone over Bluetooth with a simple app interface.
Drawing Robot
Two motors move a pen over paper to trace shapes — a tiny plotter you build yourself.
Solar Bug
A small solar cell powers a motor so a robot bug moves whenever the sun shines.
Ultrasonic Radar
A sweeping sensor maps nearby objects on a screen like a sonar display.
Self-Balancing Robot
A gyroscope and fast motor corrections keep a two-wheel robot standing upright.
Soft Pneumatic Gripper
Air inflates a flexible gripper that curls to grab delicate objects without crushing them.
Sweeper Robot
A spinning brush and random-bounce driving let a little bot sweep crumbs off the floor.
Mini Sumo Robot
Two robots push to shove each other out of a ring — sensors keep them in and aimed at the foe.
Plant-Watering Robot
A moisture sensor triggers a pump so your plant waters itself only when the soil is dry.
Voice-Activated Lights
Clap or speak a command and a microphone-driven robot toggles its lights or motors.
Maze-Solving Robot
Wall sensors and a left-hand rule guide a robot through a maze to the exit.
Gesture-Controlled Robot
Tilt a glove with a motion sensor and the robot mirrors your hand to drive around.
Four-Bar Walker
Linkages turn one spinning motor into legs that walk a robot forward without wheels.
Robot Snake
Several servos in a chain ripple in sequence to slither a snake-like robot across the floor.
Conveyor Sorter
A belt carries objects past a sensor that flicks each one into the right bin.
Fire-Detecting Robot
A flame sensor steers a robot toward a small flame and triggers a fan or pump to put it out.
Wall-Following Robot
One side sensor keeps a robot a fixed distance from a wall as it cruises a corridor.
RFID Access Gate
A card reader opens a servo gate only for the right tag — a model security checkpoint.
IR Remote-Controlled Car
Reuse an old TV remote to drive a robot car using infrared signals.