HELP with stepper motor

Other Hardware Motors, Mechanics, Power and CNC
1

I have a stepper motor which i think needs more current as it is unable to rotate from arduino the problem is that i do not have any shield or some driver circuit to provide it sufficient current is there any method to amplify the currents from the pins 8,9,10,11 so that it can rotate the stepper motor.
This is the code i am using

#include <Stepper.h>

const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
// for your motor

// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

void setup() {
  // set the speed at 60 rpm:
  myStepper.setSpeed(60);
  // initialize the serial port:
  Serial.begin(9600);
}

void loop() {
  // step one revolution  in one direction:
  Serial.println("clockwise");
  myStepper.step(stepsPerRevolution);
  delay(500);

  // step one revolution in the other direction:
  Serial.println("counterclockwise");
  myStepper.step(-stepsPerRevolution);
  delay(500);
}

The motor is sounding like inside the motor something is rotating properly as it is properly stopping from .5 seconds after one rotation and then feels like taking taking another rotation in the opposite direction. So if supply is the reason how can i solve it?

2

If you are trying to power a motor (any motor, however small) from the digital output pins of an Arduino you will be very very lucky not to damage the Arduino. The maximum current from any digital pin is 40 milliamps and really you should not draw more than 20 mA.

The ideal way to control a stepper motor is to use a stepper motor driver board such as a Pololu A4988 or equivalents from (eg Sparkfun). The Pololu website has a wiring diagram.

It is also possible to use transistors to amplify the output of the Arduino pins but that would be very much second best and a lot more trouble.

The motor should also have a power supply separate from the Arduino (i.e. not the Arduino 5v pin) with the power supply ground and the Arduino ground connected.

...R