Problem with pololu a4988

Support Motor controllers/drivers and motors
1

Hello,

I have connected a pololu a4988 to a bipolar stepper motor, but it doesn’t work. The pololu is new and I have checked all connections and I can’t find where the problem is. The electric scheme is as follows:

And the code:

#include <AccelStepper.h>

AccelStepper stepper(1,30,32); 

void setup()
{  
   stepper.setMaxSpeed(60);
   stepper.setSpeed(50);
     pinMode(48,OUTPUT);
  pinMode(46,OUTPUT);
  pinMode(44,OUTPUT);
  pinMode(42,OUTPUT);
  digitalWrite(48,LOW);
  digitalWrite(46,LOW);
  digitalWrite(44,LOW);
  digitalWrite(42,LOW);   
}

void loop()
{  
   stepper.runSpeed();
}

I’d be very appreciated if you can help me to solve this issue.
Thank you very much!

esquema arduino.JPG1050×467 141 KB

2

Hello.

Are you connecting the grounds between the driver and the Arduino? Do you have access to an oscilloscope? Could you post a picture of your setup?

- Ryan