#include <SoftwareSerial.h> 
 
//모터 PIN 설정
#define LEFT_A1 8 
#define LEFT_B1 9
#define RIGHT_A2 10 
#define RIGHT_B2 11 
 
//블루투스 PIN 설정
#define BLUE_TX 2 
#define BLUE_RX 4 
 
SoftwareSerial mySerial(2,4);  
char value; 
 
void setup() {
  Serial.begin(9600);   
  mySerial.begin(9600); 
 
  pinMode(LEFT_A1, OUTPUT);
  pinMode(RIGHT_A2, OUTPUT);
  pinMode(LEFT_B1, OUTPUT);
  pinMode(RIGHT_B2, OUTPUT);  
  
  Serial.println("Arduino Bluetooth Car is ready to start");
}
 
void loop() {
  while(mySerial.available())  
  {
     value = mySerial.read(); 
     Serial.print(value);
     
     if(value == 'l'){            //좌회전(강)
       Serial.println("left");
       left();
     }else if(value == 'r'){      //우회전(강)
       Serial.println("right");
       right();
     }else if(value == 'f'){      //전진
       Serial.println("forward");
       forward();
     }else if(value == 'b'){      //후진
       Serial.println("backward");
       backward();
     }else if(value == 'w'){      //우회전(약)
       Serial.println("slow right");
       sRight();
     }else if(value == 'q'){      //좌회전(약)
       Serial.println("slow left");
       sLeft();       
     }else if(value == 's'){      //정지
       Serial.println("stop");    
       stop(); 
     }
  }
  
}
 
// 자동차 움직임 정의 Function 들
void forward(){
  digitalWrite(LEFT_A1, HIGH);
  digitalWrite(LEFT_B1, LOW);
  digitalWrite(RIGHT_A2, HIGH);
  digitalWrite(RIGHT_B2, LOW);
}
void backward(){
  digitalWrite(LEFT_A1, LOW);
  digitalWrite(LEFT_B1, HIGH);
  digitalWrite(RIGHT_A2, LOW);
  digitalWrite(RIGHT_B2, HIGH);
}
void left(){
  digitalWrite(LEFT_A1, LOW);
  digitalWrite(LEFT_B1, HIGH);
  digitalWrite(RIGHT_A2, HIGH);
  digitalWrite(RIGHT_B2, LOW);
}
void right(){
  digitalWrite(LEFT_A1, HIGH);
  digitalWrite(LEFT_B1, LOW);
  digitalWrite(RIGHT_A2, LOW);
  digitalWrite(RIGHT_B2, HIGH);
}
void sLeft(){
  digitalWrite(LEFT_A1, LOW);
  digitalWrite(LEFT_B1, LOW);
  digitalWrite(RIGHT_A2, HIGH);
  digitalWrite(RIGHT_B2, LOW);
}
void sRight(){
  digitalWrite(LEFT_A1, HIGH);
  digitalWrite(LEFT_B1, LOW);
  digitalWrite(RIGHT_A2, LOW);
  digitalWrite(RIGHT_B2, LOW);
}
void stop(){
  digitalWrite(LEFT_A1, LOW);
  digitalWrite(LEFT_B1, LOW);
  digitalWrite(RIGHT_A2, LOW);
  digitalWrite(RIGHT_B2, LOW);
} 
 
현재 코드가 이렇게 짜보았으며 블루투스 작동시 직진 방향인데 한쪽 바퀴뿐이 안움직이네요.. 무엇이 문제일까요?