What is microstepping?

Microstepping partially energises two coils at once to land the rotor between full steps — 1/2, 1/4, up to 1/256 of a step. A 200-step motor can become 51,200 microsteps per turn, giving smoother, quieter motion. It's why 3D printers run so smoothly.

Do stepper motors need a driver?

Yes. A stepper driver (A4988, DRV8825, or the quiet TMC2209) handles the coil-switching current. Your microcontroller just sends two signals — STEP (one pulse per step) and DIR (direction) — and the driver does the rest.

Why do stepper motors lose steps?

Because they run open-loop with no position feedback. If the load is too heavy or the motor accelerates too fast, the rotor can fail to keep up and silently skip steps — the controller never knows. Sizing the motor with margin and ramping speed gently prevents it.

Stepper Motors in Robotics

Q: How does a stepper motor work?

A stepper motor has several electromagnetic coils around the rotor. Energising them in sequence pulls the rotor a small fixed amount — typically 1.8° per step. Send 200 pulses and it turns exactly one full revolution. No sensor is needed: the steps themselves are the position.

A stepper motor moves in fixed, discrete steps — usually 1.8° each, so 200 steps make one full turn. By counting pulses you always know the exact angle, with no position sensor required. That makes steppers ideal for precise, repeatable motion like 3D printers, CNC machines, and camera sliders.

Steppers are the precision workhorse of hobby robotics. Where a servo sweeps to an angle, a stepper ticks through exact steps. Let's see how — and try it yourself.

How does a stepper motor work?

Inside are multiple coils arranged around a toothed rotor. Energise the coils in the right order and the rotor jumps to align with the magnetic field — one small, exact step at a time. A common motor takes 200 steps for a full 360° turn.

Steps: 0 · Angle: 0.0° · Revolutions: 0.00

A common stepper turns 1.8° per pulse — exactly 200 steps per full turn. No position sensor needed: count the pulses and you know the angle. (Overload it and it can skip steps.)

Step = position

Because every step is the same fixed angle, the controller can track position just by counting pulses it sent. No sensor required — which is why steppers are cheap to make precise.

Microstepping — smoother, quieter motion

By partially energising two coils together, a driver can position the rotor between full steps. Subdivisions of 1/2, 1/4, 1/16, even 1/256 are common. A 200-step motor at 1/256 gives over 51,000 microsteps per turn — that's the buttery-smooth, near-silent motion of a modern 3D printer.

Stepper drivers

A4988 and DRV8825

The classic cheap drivers. They take STEP and DIR signals from your microcontroller and switch the coil currents. Set the current limit, pick a microstep mode with jumpers, and go.

TMC2209 (silent driver)

A smarter driver with quiet "StealthChop" mode and stall detection. It's why newer 3D printers are almost silent. Slightly more expensive, but a big upgrade in noise and smoothness.

When should you use a stepper?

Choose a stepper when you need precise positioning, strong holding torque at rest, and low cost — without adding a feedback sensor. 3D printers, CNC routers, pick-and-place heads, and camera sliders all rely on them. Just respect the limit: overload a stepper and it skips steps with no warning. Compare options in our servo vs stepper guide.