มันขึ้นว่า redefinition String command ช่วยดูทีครับ

🎛 Electronic
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วางโค้ตเต็มและ error ด้วยครับ

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ดึงไฟล์มาหมดหรือปล่าวครับ @SK_Main ถ้าใช้ ไฟล์นี้จริง มัน Compile ผ่านนะครับ (แค่สงสัยครับ)

#define ENA 14 // Enable/speed motors Right GPIO14(D5)
#define ENB 12 // Enable/speed motors Left GPIO12(D6)
#define IN_1 15 // L298N in1 motors Right GPIO15(D8)
#define IN_2 13 // L298N in2 motors Right GPIO13(D7)
#define IN_3 2 // L298N in3 motors Left GPIO2(D4)
#define IN_4 0 // L298N in4 motors Left GPIO0(D3)

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>

String command; //String to store app command state.
int speedCar = 800; // 400 - 1023.
int speed_Coeff = 3;

const char* ssid = "NodeMCU Car";
ESP8266WebServer server(80);

void setup() {

pinMode(ENA, OUTPUT);
pinMode(ENB, OUTPUT);

pinMode(IN_1, OUTPUT);
pinMode(IN_2, OUTPUT);
pinMode(IN_3, OUTPUT);
pinMode(IN_4, OUTPUT);

Serial.begin(115200);

// Connecting WiFi

WiFi.mode(WIFI_AP);
WiFi.softAP(ssid);

IPAddress myIP = WiFi.softAPIP();
Serial.print("AP IP address: ");
Serial.println(myIP);

// Starting WEB-server
server.on ( "/", HTTP_handleRoot );
server.onNotFound ( HTTP_handleRoot );
server.begin();

}

void goAhead(){

  digitalWrite(IN_1, LOW);
  digitalWrite(IN_2, HIGH);
  analogWrite(ENA, speedCar);

  digitalWrite(IN_3, LOW);
  digitalWrite(IN_4, HIGH);
  analogWrite(ENB, speedCar);
}

void goBack(){

  digitalWrite(IN_1, HIGH);
  digitalWrite(IN_2, LOW);
  analogWrite(ENA, speedCar);

  digitalWrite(IN_3, HIGH);
  digitalWrite(IN_4, LOW);
  analogWrite(ENB, speedCar);
}

void goRight(){

  digitalWrite(IN_1, HIGH);
  digitalWrite(IN_2, LOW);
  analogWrite(ENA, speedCar);

  digitalWrite(IN_3, LOW);
  digitalWrite(IN_4, HIGH);
  analogWrite(ENB, speedCar);
}

void goLeft(){

  digitalWrite(IN_1, LOW);
  digitalWrite(IN_2, HIGH);
  analogWrite(ENA, speedCar);

  digitalWrite(IN_3, HIGH);
  digitalWrite(IN_4, LOW);
  analogWrite(ENB, speedCar);
}

void goAheadRight(){

  digitalWrite(IN_1, LOW);
  digitalWrite(IN_2, HIGH);
  analogWrite(ENA, speedCar/speed_Coeff);

  digitalWrite(IN_3, LOW);
  digitalWrite(IN_4, HIGH);
  analogWrite(ENB, speedCar);
}

void goAheadLeft(){

  digitalWrite(IN_1, LOW);
  digitalWrite(IN_2, HIGH);
  analogWrite(ENA, speedCar);

  digitalWrite(IN_3, LOW);
  digitalWrite(IN_4, HIGH);
  analogWrite(ENB, speedCar/speed_Coeff);
}

void goBackRight(){

  digitalWrite(IN_1, HIGH);
  digitalWrite(IN_2, LOW);
  analogWrite(ENA, speedCar/speed_Coeff);

  digitalWrite(IN_3, HIGH);
  digitalWrite(IN_4, LOW);
  analogWrite(ENB, speedCar);
}

void goBackLeft(){

  digitalWrite(IN_1, HIGH);
  digitalWrite(IN_2, LOW);
  analogWrite(ENA, speedCar);

  digitalWrite(IN_3, HIGH);
  digitalWrite(IN_4, LOW);
  analogWrite(ENB, speedCar/speed_Coeff);
}

void stopRobot(){

  digitalWrite(IN_1, LOW);
  digitalWrite(IN_2, LOW);
  analogWrite(ENA, speedCar);

  digitalWrite(IN_3, LOW);
  digitalWrite(IN_4, LOW);
  analogWrite(ENB, speedCar);
}

void loop() {
server.handleClient();

  command = server.arg("State");
  if (command == "F") goAhead();
  else if (command == "B") goBack();
  else if (command == "L") goLeft();
  else if (command == "R") goRight();
  else if (command == "I") goAheadRight();
  else if (command == "G") goAheadLeft();
  else if (command == "J") goBackRight();
  else if (command == "H") goBackLeft();
  else if (command == "0") speedCar = 400;
  else if (command == "1") speedCar = 470;
  else if (command == "2") speedCar = 540;
  else if (command == "3") speedCar = 610;
  else if (command == "4") speedCar = 680;
  else if (command == "5") speedCar = 750;
  else if (command == "6") speedCar = 820;
  else if (command == "7") speedCar = 890;
  else if (command == "8") speedCar = 960;
  else if (command == "9") speedCar = 1023;
  else if (command == "S") stopRobot();
}

void HTTP_handleRoot(void) {

if( server.hasArg("State") ){
Serial.println(server.arg("State"));
}
server.send ( 200, "text/html", "" );
delay(1);
}