Stepper Motor Steps at Wrong Angle

In this tutorial, you'll learn about Stepper Motor Steps at Wrong Angle. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

The Problem

One full revolution requires the wrong number of steps.

Quick Fix

Wrong

#include <Stepper.h>

Stepper myStepper(200, 8, 9, 10, 11);

void setup() { myStepper.setSpeed(30); }

void loop() {
  myStepper.step(200);
  delay(1000);
}```

Motor rotates ~360 degrees (200 steps = 1 rev for NEMA 17, but may be wrong for other motors).

### Right

```cpp
#include <Stepper.h>

// 28BYJ-48: 2048 steps/rev (64:1 gearbox, 5.625 deg/step)
// NEMA 17: 200 steps/rev (1.8 deg/step)
// NEMA 23: 400 steps/rev (0.9 deg/step)

const float DEG_PER_STEP = 1.8;
const int STEPS_PER_REV = 360.0 / DEG_PER_STEP;

Stepper myStepper(STEPS_PER_REV, 8, 9, 10, 11);

void setup() {
  myStepper.setSpeed(30);
  Serial.begin(9600);
  Serial.print("Steps/rev: ");
  Serial.println(STEPS_PER_REV);
}

void loop() {
  myStepper.step(STEPS_PER_REV);
  delay(2000);
}```

Steps/rev: 200 Motor rotates exactly 360 degrees.

## Prevention

Stepper motors have specific step angles: 1.8 deg (200 steps/rev), 0.9 deg (400 steps/rev), or 5.625 deg with gearbox (2048 steps/rev for 28BYJ-48). ALWAYS check the datasheet. Formula: steps_per_rev = 360 / step_angle. For geared motors, multiply base steps by gear ratio.

DodaTech engineers apply these same patterns across Doda Browser, DodaZIP, and Durga Antivirus Pro for production IoT reliability.

## FAQ

<details style="margin-bottom:12px;border:1px solid #e2e8f0;border-radius:10px;overflow:hidden"><summary style="cursor:pointer;padding:14px 18px;font-weight:600;font-size:1.05rem;background:#f8fafc;border-bottom:1px solid #e2e8f0;color:#1e293b">### How to find my motor's steps/rev?</summary><div style="padding:14px 18px;color:#475569;line-height:1.7;background:#fff"><p>Check datasheet for step angle. 360 / step_angle = steps per rev. 1.8 deg = 200, 0.9 deg = 400, 7.5 deg = 48.</p>
<h3 id="what-about-microstepping">What about microstepping?</h3><p>A4988/DRV8825 microstepping multiplies steps. 1/16 microstep = 3200 steps/rev. Adjust STEPS_PER_REV accordingly.</p>
<h3 id="my-28byj-48-only-does-2048-steps">My 28BYJ-48 only does 2048 steps?</h3><p>Correct. 28BYJ-48: 64 steps * 63.68395 gearbox ratio = ~2048 steps. Some libraries use 4096 by halving gear ratio. Test with step(2048).</p>
</div></details>