#include <Wire.h>

int STEP = 9; 
int DIR = 10;
boolean turn = false;

void receiveEvent(int howMany) { //Read Transfer Data
  
  
while (Wire.available() > 0) {
  
  int A = Wire.read();
  Serial.print(A);

  turn = !turn;
}


}

void setup() {
  Wire.begin(2); //slave address
  Wire.onReceive(receiveEvent); //Call the reciveEvent function when data is sent
  Serial.begin(9600);
  pinMode(STEP,OUTPUT); 
  pinMode(DIR,OUTPUT);
}

void loop() {
  if(turn == true) {
    motergo();
  }
  delay(20);
}

void motergo() {
   digitalWrite(DIR,HIGH); // + Direction
  
 for(int x = 0; x < 200; x++) {  // 200 pulses one revolution
   digitalWrite(STEP,HIGH); 
   delayMicroseconds(1200); 
   digitalWrite(STEP,LOW); 
   delayMicroseconds(1200); 
 }
}