NANO Arduino CNC shield

 Needed to remove Mot_VOT_Sel (green jumper next power connector) before programming from Arduino IDE as supposed the external power prevent the reseting of the NANO

NOTE that most of the online pictures of the A4988 modules are inserted in the WRONG orientation.  Following picture is my working one.

CONTROL     Dir    Step

       X             pin2    pin5

       Y             pin3    pin6

       Z             pin4    pin7

Used the following to test the board with the modules:

/*     Simple Stepper Motor Control Exaple Code

 *      

 *  by Dejan Nedelkovski, www.HowToMechatronics.com

 *  

 */

// defines pins numbers for X

const int stepPin = 5; 

const int dirPin = 2; 

 

void setup() {

  // Sets the two pins as Outputs

  pinMode(stepPin,OUTPUT); 

  pinMode(dirPin,OUTPUT);

}

void loop() {

  digitalWrite(dirPin,HIGH); // Enables the motor to move in a particular direction

  // Makes 200 pulses for making one full cycle rotation

  for(int x = 0; x < 200; x++) {

    digitalWrite(stepPin,HIGH); 

// increase the delay to 1 msec as the original 0.5 msec wouldn't work well

    delayMicroseconds(1000); 

    digitalWrite(stepPin,LOW); 

    delayMicroseconds(1000); 

  }

  delay(1000); // One second delay

  

  digitalWrite(dirPin,LOW); //Changes the rotations direction

  // Makes 400 pulses for making two full cycle rotation

  for(int x = 0; x < 400; x++) {

    digitalWrite(stepPin,HIGH);

    delayMicroseconds(1000);

    digitalWrite(stepPin,LOW);

    delayMicroseconds(1000);

  }

  delay(1000);

}