Gradually stepping up the speed of the stepper motor

Using Arduino Programming Questions
1

Hi, I have difficulty in gradually increasing and decreasing the speed of the stepper motor using Arduino Mega2560. I need some help in programming.
This is how my code looks so far :

#include <Stepper.h>

// change this to the number of steps per revolution for your motor
#define STEPS 7200
#define pulse 10
#define dir 9
#define enable 11

//opto is connected to 5V pin of Arduino (range of opto is between 4.5 - 6VDC)
// create an instance of the stepper class, specifying
// the number of steps per revolution for the motor and 
// the pins it's attached to
Stepper stepper(STEPS, 9,10);

int steps = 0;

void setup()
{
  // set the speed of the motor to 30 RPM
  stepper.setSpeed(30);
  Serial.begin(9600);
}

void loop(){
  digitalWrite(enable, HIGH);
  digitalWrite(dir, HIGH);
  digitalWrite(pulse, HIGH);
  digitalWrite(pulse, LOW);
  digitalWrite(dir, LOW);
  digitalWrite(pulse, HIGH);
  digitalWrite(pulse, LOW);

  if (Serial.available()>0){
    steps = Serial.parseInt();
    }
    if( steps != 0){
      stepper.step(steps);
      }
      steps=0;
}
2

The AccelStepper library allows to limit both acceleration and speed.

3

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