Problem with nema 17 stepper and grbl library

Other Hardware Motors, Mechanics, Power and CNC
17

Robin2:
Looking again at the video with the knowledge of the program you used I wonder if you have accidentally mixed up the step and direction connections.

The program should cause the motor to run smoothly for a half revolution (100 steps) in one direction, pause, and then run back for a half revolution in the other direction.

Try the program with millisbetweenSteps increased to 1000 for much slower operation. And uncomment his line

// delayMicroseconds(pulseWidthMicros); // probably not needed

There was another Thread very recently where someone's stepper motor behaved erratically when the Arduino was starting and that was solved, IIRC, by putting a 5600 Ohm resistor between the step pin and GND. My own A4988 drivers do not have that problem.

...R

I try to uncomment the line but nothing change.
I'll try with the resistor twomorrow because now i don't have it.
i hope it will work :frowning: .

rpt007:
Having set up my driver's current limit I normally use the following sketch, which more or less is equal to Robin2's program:

int dirPin = 8;

int stepperPin = 7;
void setup() {
  Serial.begin(9600);
  pinMode(dirPin, OUTPUT);
  pinMode(stepperPin, OUTPUT);
}
void step(boolean dir, int steps) {
  digitalWrite(dirPin, dir);
  delay(50);
  for (int i = 0; i < steps; i++) {
    digitalWrite(stepperPin, HIGH);
    delayMicroseconds(500);
    digitalWrite(stepperPin, LOW);
    delayMicroseconds(500);
  }
}
void loop() {
  step(true, 3000);
  //  Time to measure the current:
  delay(2000);
  step(false, 3000);
  //  Time to measure the current:
  delay(2000);
}




The delay between the direction changes is used to measure the current (just a level indication) flowing through one coil by having an amp meter in series with that one coil.

This gives me a solid proof that the driver was set up properly.

I try you code and this is the result:

I don't think it's working well.