Calculate the correct current limit for driver A4988

Other Hardware Motors, Mechanics, Power and CNC
20

Do you mean like this? In that case it wont work for me. It doesnt run at all. Just idle

const int coilA = 2;
const int coilB =  3;
const int ms = 800;
int inc = 0;
bool changeDir = false;

void setup() {
  Serial.begin(9600);

  pinMode(coilA, OUTPUT);
  pinMode(coilB, OUTPUT);
  digitalWrite(coilA, LOW);
  digitalWrite(coilB, LOW);
}

void loop() {
  if (inc % 500 == 0) {
    changeDir = !changeDir;
    delay(100);
  }
  if (changeDir == 1) {
    cw();
  } else if (changeDir == 0) {
    ccw();
  }
  inc++;
}

void cw() {
  step1();
  delayMicroseconds(ms);
  step2();
  delayMicroseconds(ms);
  step3();
  delayMicroseconds(ms);
  step4();
  delayMicroseconds(ms);
}

void ccw() {
  step4();
  delayMicroseconds(ms);
  step3();
  delayMicroseconds(ms);
  step2();
  delayMicroseconds(ms);
  step1();
  delayMicroseconds(ms);
}

void step1 () {
  digitalWrite(coilA, LOW);
  digitalWrite(coilB, HIGH);
}

void step2 () {
  digitalWrite(coilA, HIGH);
  digitalWrite(coilB, HIGH);
}

void step3 () {
  digitalWrite(coilA, HIGH);
  digitalWrite(coilB, LOW);
}

void step4 () {
  digitalWrite(coilA, LOW);
  digitalWrite(coilB, LOW);
}

This do work bot direction is still not reliable:

const int coilA = 2;
const int coilB =  3;
const int ms = 800;
int inc = 0;
bool changeDir = false;

void setup() {
  Serial.begin(9600);

  pinMode(coilA, OUTPUT);
  pinMode(coilB, OUTPUT);
  digitalWrite(coilA, LOW);
  digitalWrite(coilB, LOW);
}

void loop() {
  if (inc % 500 == 0) {
    changeDir = !changeDir;
    delay(100);
  }
  if (changeDir == 1) {
    cw();
  } else if (changeDir == 0) {
    ccw();
  }
  inc++;
}

void cw() {
  step1();
  step2();
  step3();
  step4();
}

void ccw() {
  step4();
  step3();
  step2();
  step1();
}

void step1 () {
  digitalWrite(coilA, LOW);
  delayMicroseconds(ms);
  digitalWrite(coilB, HIGH);
  delayMicroseconds(ms);
}

void step2 () {
  digitalWrite(coilA, HIGH);
  delayMicroseconds(ms);
  digitalWrite(coilB, HIGH);
  delayMicroseconds(ms);
}

void step3 () {
  digitalWrite(coilA, HIGH);
  delayMicroseconds(ms);
  digitalWrite(coilB, LOW);
  delayMicroseconds(ms);
}

void step4 () {
  digitalWrite(coilA, LOW);
  delayMicroseconds(ms);
  digitalWrite(coilB, LOW);
  delayMicroseconds(ms);
}