DRV8825 Driver Board

// Canonical DRV8825 example for Arduino Uno
// This sketch steps a NEMA17 stepper motor forward and backward using the DRV8825 driver.

const int STEP_PIN = 2;
const int DIR_PIN  = 3;
const int EN_PIN   = 4;
const int M0_PIN   = 5;
const int M1_PIN   = 6;
const int M2_PIN   = 7;

const int STEP_DELAY_US = 800; // Lower = faster stepping
const int STEPS_PER_DIRECTION = 400;

void stepMotor(int steps) {
  for (int i = 0; i < steps; i++) {
    digitalWrite(STEP_PIN, HIGH);
    delayMicroseconds(4);
    digitalWrite(STEP_PIN, LOW);
    delayMicroseconds(STEP_DELAY_US);
  }
}

void setup() {
  pinMode(STEP_PIN, OUTPUT);
  pinMode(DIR_PIN, OUTPUT);
  pinMode(EN_PIN, OUTPUT);
  pinMode(M0_PIN, OUTPUT);
  pinMode(M1_PIN, OUTPUT);
  pinMode(M2_PIN, OUTPUT);

  Serial.begin(9600);
  while (!Serial) { }

  // Full-step mode: M0=M1=M2 LOW
  digitalWrite(M0_PIN, LOW);
  digitalWrite(M1_PIN, LOW);
  digitalWrite(M2_PIN, LOW);

  // Active-low enable: LOW turns the driver on
  digitalWrite(EN_PIN, LOW);

  // RESET and SLP are tied high in wiring, so the driver is awake.
  Serial.println("DRV8825 stepper demo starting...");
}

void loop() {
  Serial.println("Direction: clockwise");
  digitalWrite(DIR_PIN, HIGH);
  stepMotor(STEPS_PER_DIRECTION);
  delay(1000);

  Serial.println("Direction: counterclockwise");
  digitalWrite(DIR_PIN, LOW);
  stepMotor(STEPS_PER_DIRECTION);
  delay(1000);
}