Max speed problem

[Sam]

Hi all,

I am using arduino mega 2560 with just one stepper motor and i am not satisfied with the max speed (still very slow). Is it possible to increase pwm frequency so that the max speed can be increased further?

Thanks!

Sam

[gregor]

what motor driver are you using?

[Sam]

I am using this H2MD Bipolar Stepper Motor Driver. 

[gregor]

AccelStepper does not use PWM. Setting a shorter pulse width may help (http://www.airspayce.com/mikem/arduino/AccelStepper/classAccelStepper.html#af4d3818e691dad5dc518308796ccf154).
How fast do you want to go and what is the speed you can currently achieve?

[James Pistorino]

Did you ever solve this? 

I have the same issue with the MEGA.

Thanks,
James

[ahmed essam]

i have the same problem did you fix it  ???? 

how i use the microseconds in my code  :

 #include <AccelStepper.h>

#define LONG_MAX 2147483647     //maximum value for (signed) long int.

int accvalue=1000;

int speedvalue=9000;

int pot=A3;

 

 

 

 // Define a stepper and the pins it will use

AccelStepper stepper; // Defaults to AccelStepper::FULL4WIRE (4 pins) on 2, 3, 4, 5

int sw=9;

int sw1=8;

int k;

int h;

int h_last;   //last state of h

int k_last;   //last state of k

void setup()

{  

  pinMode(sw, INPUT);

  pinMode(sw1, INPUT);

  stepper.setMaxSpeed(90000);

  stepper.setAcceleration(15000);

  h_last = digitalRead(sw);

  k_last = digitalRead(sw1);

  Serial.begin(9600);

}

void loop()

{ 

  h=digitalRead(sw);

  k=digitalRead(sw1);

  

  stepper.setMaxSpeed(90000);

  

 

  if (h != h_last)

  {

    h_last = h;

    

    if(h == LOW)

    {  

      stepper.moveTo(LONG_MAX / 2);   //move in positive direction

      digitalWrite(3,HIGH);

    }    

    else

    {

      stepper.stop();       //stop the stepper

    }

  }

  

  if (k != k_last) 

  {

    k_last = k;

    

    if(k == HIGH)

    {   

      stepper.moveTo(-LONG_MAX / 2);   //move in negative direction

      digitalWrite(4,HIGH);

    }

    else

    {

      stepper.stop();       //stop the stepper

    }

  }

  stepper.run();

  

}