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DIY robot concept

How to make a robot car

A beginner rover-style car with two motors, steering by speed difference, obstacle sensing, Bluetooth control and clean battery wiring.

A robot car is the simplest useful mobile robot because it teaches motor power, steering, sensor reading and basic autonomy without hard mechanics. Start with a two-wheel differential drive base before adding cameras or GPS.

The reliable version has a real motor driver, separate motor power, a switch, strain relief and a slow test mode. Once the car drives straight and turns repeatably, add ultrasonic, ToF or bumper sensing for obstacle behavior.

Core parts

Two gear motors and wheels

$18

Differential drive movement

Caster or skid

$5

Third support point for a stable chassis

ESP32 or Arduino controller

$8

Motor commands, sensors and optional Bluetooth

TB6612FNG motor driver

$6

Efficient speed and direction control

Battery and 5V regulator

$18

Separate motor and logic power

Ultrasonic or ToF sensor

$8

Basic obstacle detection

Design variants

Bluetooth robot car

Use a phone joystick to test steering before autonomy.

Obstacle avoider

Drive slowly, scan distance and reverse when blocked.

Camera rover upgrade

Add Raspberry Pi video after the base is reliable.

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 power it from the Arduino?

No. Motors need their own battery path through a motor driver.

Why does it not drive straight?

Motors rarely match perfectly. Calibrate left and right PWM or add encoders.

Is four-wheel drive better?

Only for rough floors. Two driven wheels are easier for a first robot car.

Robot build paths

How to make a robot

Related robot guides

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