Stepper motor failing

Other Hardware Motors, Mechanics, Power and CNC
1

Hi! I have a stepper motor (driver pololu 4988) controlled with Arduino, it sends signals to a scene in Unity. The motor must to rotate (clockwise or counterclockwise) a light polystyrene base. I'm having problems becase sometimes it doesn't rotate with enough strong (very very slowly) or it rotates in only one direction. I attach the Arduino code.

    #include <SerialCommand.h>
    #include <SoftwareSerial.h>
    #define DEBUG(a) Serial.println(a);
    const int dirPin = 2;
    const int stepPin = 3;
    float right = 0;
    float left = 0;
    const int steps = 200;
    int stepDelay;
    
    
    void setup() {
      // Mark pins as OUT
      pinMode(dirPin, OUTPUT);
      pinMode(stepPin, OUTPUT);
      Serial.begin(9600);
    }
    
    void loop() {
      if (Serial.available()) {
        int data = Serial.parseInt();
        Serial.print(data);
        DEBUG(data);
        if (data > 1 ) {
          right = data;
          //Change direction and increase speed
          digitalWrite(dirPin, HIGH);
          stepDelay = 600;
          //Turn 400 steps to complete 2 turns
          for (int x = 0; x < right; x++) {
            digitalWrite(stepPin, HIGH);
            delayMicroseconds(stepDelay);
            digitalWrite(stepPin, LOW);
            delayMicroseconds(stepDelay);
          }
        }
    
        if (data < 0) {
          left = data;
          left *=-1;
          digitalWrite(dirPin, LOW);
          stepDelay = 600;
          // Turn 200 steps to complete 2 turns
          for (int x = 0; x < left; x++) {
            digitalWrite(stepPin, HIGH);
            delayMicroseconds(stepDelay);
            digitalWrite(stepPin, LOW);
            delayMicroseconds(stepDelay);
          }
        }
      }}
    
      /*//Activate a dirección and lock a speed with stepDelay
        digitalWrite(dirPin, HIGH);
        stepDelay = 600;
        // Turn 200 steps to complete 2 turns
        for (int x = 0; x < left; x++) {
         digitalWrite(stepPin, HIGH);
         delayMicroseconds(stepDelay);
         digitalWrite(stepPin, LOW);
         delayMicroseconds(stepDelay);
        }
        delay(1000);
    
        //Change direction and increase speed
        digitalWrite(dirPin, LOW);
        stepDelay = 600;
        // Turn 400 steps to complete 2 turns
        for (int x = 0; x < right; x++) {
         digitalWrite(stepPin, HIGH);
         delayMicroseconds(stepDelay);
         digitalWrite(stepPin, LOW);
         delayMicroseconds(stepDelay);
        }
        delay(1000);
      */

Thanks!

2

Please post links to the stepper motor, the stepper motor power supply and a clear wiring diagram (not Fritzing).

To what value did you set the current limit on the A4988 driver (a required step)?

3

The stepper may not be able to go from 0 right to 833 steps per second without acceleration. Does it work better at lower speeds.

This Pololu A4988 page shows how to adjust the current limit.

4

These links may help

Stepper Motor Basics
Simple Stepper Code

...R