Stepper Motor Does Not Move to Target

In this tutorial, you'll learn about Stepper Motor Does Not Move to Target. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

The Problem

Stepper.step() is called but the motor does not reach the desired absolute position.

Quick Fix

Wrong

#include <Stepper.h>

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

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

void loop() {
  myStepper.step(100);
  delay(500);
  myStepper.step(-50);
  delay(500);
}```

Motor moves 100 steps forward, 50 back. Position drifts over time.

### Right

```cpp
#include <Stepper.h>

Stepper myStepper(200, 8, 9, 10, 11);
int position = 0;
int target = 200;

void setup() {
  myStepper.setSpeed(30);
  Serial.begin(9600);
}

void loop() {
  int delta = target - position;
  myStepper.step(delta);
  position = target;

  Serial.print("At: ");
  Serial.println(position);

  target = (target == 200) ? 0 : 200;
  delay(1000);
}```

At: 200 At: 0 (No drift -- absolute position tracking)

## Prevention

The basic Stepper library tracks relative position only. step(N) moves N steps from current position. For absolute positioning, manually track position by accumulating step counts. Better solution: use AccelStepper library which provides moveTo() and currentPosition() for absolute positioning.

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## 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 does step() handle direction?</summary><div style="padding:14px 18px;color:#475569;line-height:1.7;background:#fff"><p>Positive = clockwise, negative = counterclockwise. The library handles coil sequencing automatically.</p>
<h3 id="can-i-move-to-absolute-position">Can I move to absolute position?</h3><p>Yes -- with AccelStepper. Use moveTo() for absolute positioning. The basic Stepper library is relative-only.</p>
<h3 id="why-does-position-drift">Why does position drift?</h3><p>Missed steps due to mechanical load, insufficient current, or acceleration too high. Reduce speed, increase current, or add closed-loop feedback.</p>
</div></details>