#define STEP0_PUL 18		//步进0_PUL
#define STEP0_DIR 19		//步进0_DIR
#define STEP0_EAN 21		//步进0_EAN

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(STEP0_PUL, OUTPUT);
  pinMode(STEP0_DIR, OUTPUT);
  pinMode(STEP0_EAN, OUTPUT);
  digitalWrite(STEP0_EAN,LOW); //打开
  digitalWrite(STEP0_DIR,LOW); //打开
}

String inString = "";  // string to hold input

void loop() {
  // put your main code here, to run repeatedly:
    while (Serial.available() > 0) {
    int inChar = Serial.read();
    if (isDigit(inChar)) {
      // convert the incoming byte to a char and add it to the string:
      inString += (char)inChar;
    }
    // if you get a newline, print the string, then the string's value:
    if (inChar == '\n') {
      Value=inString.toInt();
      Serial.print("Value:");
      Serial.println(Value);
      if(Value>0){
        digitalWrite(STEP0_DIR,LOW); 
      }
      else{
        digitalWrite(STEP0_DIR,HIGH); 
      }
      for(int i=0;i<Value;i++){
        digitalWrite(STEP0_PUL,HIGH);
        delay(50);
        digitalWrite(STEP0_PUL,LOW);
        delay(50);
      }
      // clear the string for new input:
      inString = "";
    }
  }


  delay(10);
}