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Today I found a problem in my project, here is the video of problem

https://streamable.com/wamm9

code MASTER : https://www.dropbox.com/s/l4x3zwzv6szrs50/MASTER.ino?dl=0

#include <Wire.h>

const int BUTTON1 = 5;
const int BUTTON2 = 6;
int buttonchoose;

void setup() {
  // put your setup code here, to run once:
  pinMode(BUTTON1, INPUT);
  pinMode(BUTTON2, INPUT);
  Wire.begin();
  Serial.begin(9600);
}


void loop() {
  Serial.println("You want turn X motor");
  Serial.println("1-YES  2-NO");
  buttonchoose = fonctioninput();
  delay(500);
  if (buttonchoose == 1) {
    //Turn motor x for onerevolution
    Wire.beginTransmission(8); // transmit to device #8
    Wire.write('X'); // send M (milk)
    Wire.endTransmission();    // stop transmitting
    Serial.println("send X");
  }
  Serial.println("You want turn Y motor");
  Serial.println("1-YES  2-NO");
  buttonchoose = fonctioninput();
  delay(500);
  if (buttonchoose == 1) {
    //Turn motor Y for onerevolution
    Wire.beginTransmission(8); // transmit to device #8
    Wire.write('Y'); // send M (milk)
    Wire.endTransmission();    // stop transmitting
    Serial.println("send Y");
  }

  Serial.println("You want turn Z motor");
  Serial.println("1-YES  2-NO");
  buttonchoose = fonctioninput();
  delay(500);
  if (buttonchoose == 1) {
    //Turn motor Z for onerevolution
    Wire.beginTransmission(8); // transmit to device #8
    Wire.write('Z'); // send M (milk)
    Wire.endTransmission();    // stop transmitting
    Serial.println("send Z");
  }
}


int fonctioninput() {
  int val1 = 0;
  int val2 = 0;
  int buttonreturn = 0;
  while ( (val1 - val2) == 0) {
    val1 = digitalRead(BUTTON1);
    val2 = digitalRead(BUTTON2);
  }

  if (val1 == 1) {
    buttonreturn = 1;
  }
  else {
    buttonreturn = 2;
  }
  return buttonreturn;
}

code SLAVE : https://www.dropbox.com/s/2lg8ogjep80gtsa/SLAVE.ino?dl=0

#include <Wire.h>
#include <Stepper.h>

const int stepsPerRevolution = 64;
int led = A0;
Stepper motorX(stepsPerRevolution, 2, 3, 4, 5);
Stepper motorY(stepsPerRevolution, 6, 7, 8, 9);
Stepper motorZ(stepsPerRevolution, 10, 11, 12, 13);

void setup() {
  Wire.begin(8);
  // Wire.onRequest(requestEvent);
  Wire.onReceive(receiveEvent);

  pinMode(led, OUTPUT);
  motorX.setSpeed(60);
  motorY.setSpeed(60);
  motorZ.setSpeed(60);
  Serial.begin(9600);
}


void loop() {}


void receiveEvent(int howMany) {

  char choose;

  while (Wire.available() > 0) {
    //initialization
    choose = 'A';
    choose = Wire.read();

    if (choose == 'X')    {
      Serial.println("TURN MOTOR X");

      turnX();
    }
    else if (choose == 'Y') {
      Serial.println("TURN MOTOR Y");
      turnY();
    }
    else if (choose == 'Z') {
      Serial.println("TURN MOTOR Z");
      turnZ();
    }
  }
  analogWrite(led, 1020);
  delay(300);
  analogWrite(led, 0);
}


void turnX() {
  motorX.step(stepsPerRevolution);
}


void turnY() {
  motorY.step(stepsPerRevolution);
}


void turnZ() {
  motorZ.step(stepsPerRevolution);
}

When I choose yes to turn a motor it works well but the other motors that is after does not work. I want the other motors to turn if I choose yes even if the previous motor is running. Please, I need your URGENT help because my project is blocked :(

closed as unclear what you're asking by per1234, Chris Stratton, Mazaryk, MatsK, user31481 Sep 30 '17 at 7:01

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

3

The step function from the Stepper library is blocking. So it can only run one motor at a time. You need a different stepper library that is non-blocking. Try AccelStepper.

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