🤖
DIY robot concept

How to make a maze-solving robot

A micromouse-style learning build with wall sensors, encoder odometry, cell mapping, turn calibration and a safe speed ramp.

A maze-solving robot is a step beyond line following because the robot must sense walls, estimate position and remember decisions. The first goal is not speed; it is repeatable turns and a map that matches the maze.

Build a small test maze, log sensor readings and calibrate one cell at a time. After it can explore slowly, add flood-fill or another path planner and only then increase speed.

Core parts

Small differential chassis

$30

Compact enough for maze cells

Encoder gear motors

$35

Distance and turn feedback

Side and front ToF sensors

$30

Wall distance and openings

ESP32 or STM32 controller

$10

Fast control loop and map memory

Motor driver

$8

Smooth low-speed turns

Modular maze walls

$25

Repeatable test environment

Design variants

Wall follower

Start with left-hand or right-hand rules before mapping.

Flood-fill solver

Explore cells, score distances and run the shortest path.

Speed run version

Add acceleration profiles after turns are repeatable.

Practical safety note

Treat the generated output as a prototype plan, not a certified product. Body-adjacent, high-voltage, optical-energy and mobility builds need qualified review before real-world use.

FAQ

Can I use ultrasonic sensors?

For a slow large maze, yes. Small mazes are easier with ToF sensors.

What algorithm should I start with?

Wall following is easiest. Flood-fill is a good next step for micromouse style mazes.

Why does the map drift?

Wheel slip, bad turn calibration and inconsistent wall thresholds are common causes.

Robot build paths

How to make a robot

Related robot guides

Turn this concept into a sourced build

Start with this prompt prefilled, then let RoboHub generate the live parts list, wiring plan, CAD and firmware.

Generate build

One concept like this every week

If this was useful, the weekly digest sends one new concept page + the latest addon every Monday. No spam, one click to unsubscribe.