Stepper motor 28BYJ and joystick

Hello! I want to run 2 stepper motors with a joystick, but my motor does not rotate. I put 5V, 2.5 Amp but the motor just giving some noise. Here is the sketch:

#include <Stepper.h>

const int step_360 = 200;// per 360 deg                              
// initialize the stepper library on pins 2-5 n 8-11 
Stepper myStepper1(step_360,2,3,4,5);
Stepper myStepper2(step_360,8,9,10,11);       

void setup() 
{
 // set the speed at 60 rpm:
 myStepper1.setSpeed(5);//left
 myStepper2.setSpeed(5);//right
 // initialize the serial port:
 Serial.begin(9600);
}
void loop() 
{
 // step one revolution  in one direction:
 Serial.println("clockwise");
 //myStepper1.step(step_360);
 myStepper2.step(step_360);
 delay(500);    
}

That looks like the stepper example code. Did you try it at a faster rpm? 5 is pretty slow and some motors don't behave as well at very low speeds.