Differential Drive in Robotics — Complete Guide
190 words · 1 min read
Differential drive uses two independently driven wheels and a passive caster to steer a mobile robot. Simple, cheap, and the foundation of most beginner robotics.
The concept concept: Differential drive uses two independently driven wheels and
Difficulty 3/5 · ClassroomDifferential drive is a mobile-robot locomotion scheme where two wheels on either side of the chassis are driven independently. By varying the relative speed of the two wheels, the robot moves forward, turns in place, or arcs along a curved path. A passive caster wheel keeps the chassis level.
💡 Think of it like…
Think of it like a household object that does the same job — the underlying idea is the same, just adapted for robots.
Why it matters
Without differential drive in robotics — complete guide, many concept systems in robotics simply couldn't work.
Differential Drive in Robotics
What is it?
Differential drive is a mobile-robot locomotion scheme where two wheels on either side of the chassis are driven independently. By varying the relative speed of the two wheels, the robot moves forward, turns in place, or arcs along a curved path. A passive caster wheel keeps the chassis level.
How it works
If both wheels turn at the same speed, the robot moves straight. If only the right wheel turns, the robot rotates around the stationary left wheel. If wheels turn in opposite directions at the same speed, the robot spins in place. The forward kinematics give linear velocity v = (v_left + v_right)/2 and angular velocity ω = (v_right − v_left) / wheelbase.
Real-world example
Roomba, Pepper, GreyOrange Butler, and the typical Arduino line-follower all use differential drive. It is the default locomotion for educational robotics in India.
Why it matters for robotics
Differential drive is simple enough for first-time builders but powerful enough to teach kinematics, odometry, and PID. Almost every robotics curriculum starts here.
See also
Ask R2 Co-pilot anything you didn't understand about Differential Drive in Robotics — Complete Guide. It'll explain it plainly.
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Last updated · 2026-05-21
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