🌐

IoT Lab content is currently available in Arabic only. We're working on an English version.

Advanced Stepper Control (A4988) | NexaLearn IoT Lab | NexaLearn

Motors25 دقيقة

Advanced Stepper Control (A4988)

The 3D printer driver — professional precision and movement.

Lesson Content

For large industrial stepper motors (NEMA 17), we use STEP/DIR-based drivers like A4988 or DRV8825. Instead of dealing with 4 wires, this driver only needs a direction signal (HIGH or LOW) and a second signal giving it a 'pulse' to move one step.

Components Needed

Arduino UnoNEMA 17 StepperA4988 Driverمكثف 100uF

Wiring Notes

Very important: place the capacitor next to the VMOT and GND pins of the driver, otherwise it will burn instantly when power is applied.

Code Example

const int stepPin = 3; const int dirPin = 4;
void setup() {
  pinMode(stepPin,OUTPUT); pinMode(dirPin,OUTPUT);
}
void loop() {
  digitalWrite(dirPin,HIGH); // اتجاه
  for(int x = 0; x < 200; x++) {
    digitalWrite(stepPin,HIGH);
    delayMicroseconds(500);
    digitalWrite(stepPin,LOW);
    delayMicroseconds(500);
  }
  delay(1000);
}

Common Mistakes

Running the motor without adjusting the small screw (VREF) on the driver to limit the current, which causes the motor or driver to burn.

Next Lesson

Hall Effect Sensor (Magnetic Field)