Remote Control Olive Collector Robot-Arduino/Bluetooth/Car

  const int motorA1  = 5;  // L298N'in IN3 Girişi
  const int motorA2  = 6;  // L298N'in IN1 Girişi
  const int motorB1  = 10; // L298N'in IN2 Girişi
  const int motorB2  = 9;  // L298N'in IN4 Girişi




  int i=0; 
  int j=0; 
  int state; 
  int vSpeed=255;     




void setup() {
    pinMode(motorA1, OUTPUT);
    pinMode(motorA2, OUTPUT);
    pinMode(motorB1, OUTPUT);
    pinMode(motorB2, OUTPUT);    
    Serial.begin(9600);
}
 
void loop() {
    if(Serial.available() > 0){     
      state = Serial.read();   
    }
  
  
    if (state == '0'){
      vSpeed=0;}
    else if (state == '1'){
      vSpeed=100;}
    else if (state == '2'){
      vSpeed=180;}
    else if (state == '3'){
      vSpeed=200;}
    else if (state == '4'){
      vSpeed=255;}
     

    if (state == 'F') {
      analogWrite(motorA1, vSpeed); analogWrite(motorA2, 0);
        analogWrite(motorB1, vSpeed);      analogWrite(motorB2, 0); 
    }

    else if (state == 'G') {
      analogWrite(motorA1,vSpeed ); analogWrite(motorA2, 0);  
        analogWrite(motorB1, 100);    analogWrite(motorB2, 0); 
    }

    else if (state == 'I') {
        analogWrite(motorA1, 100); analogWrite(motorA2, 0); 
        analogWrite(motorB1, vSpeed);      analogWrite(motorB2, 0); 
    }
  



    else if (state == 'B') {
      analogWrite(motorA1, 0);   analogWrite(motorA2, vSpeed); 
        analogWrite(motorB1, 0);   analogWrite(motorB2, vSpeed); 
    }
 

    else if (state == 'H') {
      analogWrite(motorA1, 0);   analogWrite(motorA2, 100); 
        analogWrite(motorB1, 0); analogWrite(motorB2, vSpeed); 
    }

    else if (state == 'J') {
      analogWrite(motorA1, 0);   analogWrite(motorA2, vSpeed); 
        analogWrite(motorB1, 0);   analogWrite(motorB2, 100); 
    }

    else if (state == 'L') {
      analogWrite(motorA1, vSpeed);   analogWrite(motorA2, 150); 
        analogWrite(motorB1, 0); analogWrite(motorB2, 0); 
    }

    else if (state == 'R') {
      analogWrite(motorA1, 0);   analogWrite(motorA2, 0); 
        analogWrite(motorB1, vSpeed);   analogWrite(motorB2, 150);     
    }
  

    else if (state == 'S'){
        analogWrite(motorA1, 0);  analogWrite(motorA2, 0); 
        analogWrite(motorB1, 0);  analogWrite(motorB2, 0);
    }  
}