#include <math.h>

#define STEP_PIN 3 
#define DIR_PIN 2

const float amplitude = 200; // Amplitude of sine wave (number of steps)
const float frequency = 1;   // Frequency of sine wave (Hz)
const float phase_shift = 0; // Phase shift of sine wave (radians)

void setup() {
  pinMode(STEP_PIN, OUTPUT);
  pinMode(DIR_PIN, OUTPUT);
}

void loop() {
  float time = millis() / 1000.0; // Time in seconds
  float angle = 2 * PI * frequency * time + phase_shift; // Calculate angle in radians
  int steps = amplitude * sin(angle); // Compute number of steps based on sine wave

  // Set direction based on sign of steps
  if (steps >= 0) {
    digitalWrite(DIR_PIN, HIGH); // Set direction (clockwise)
  } else {
    digitalWrite(DIR_PIN, LOW); // Set direction (counterclockwise)
  }

  // Generate STEP pulses
  for (int i = 0; i < abs(steps); i++) {
    digitalWrite(STEP_PIN, HIGH);
    delayMicroseconds(500); // Adjust delay for desired speed
    digitalWrite(STEP_PIN, LOW);
    delayMicroseconds(500); // Adjust delay for desired speed
  }
}