#include<SoftwareSerial.h>
SoftwareSerial mySerial(10, 11);
char data = 0;

#define IN1 2
#define IN2 4
#define IN3 6
#define IN4 7
#define EN1 5
#define EN2 3
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  mySerial.begin(9600);

  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
  pinMode(IN3, OUTPUT);
  pinMode(IN4, OUTPUT);
  pinMode(EN1, OUTPUT);
  pinMode(EN2, OUTPUT);


}

void loop()
{

  if (mySerial.available() )
  {
    data = mySerial.read();
    Serial.println(data);
    if (data == 'F')
    {
      Forward();

    }
    else if (data == 'B')
    {
      Back();
    }
    else if (data == 'L')
    {
      Left();
    }
    else if (data == 'R')
    {
      Right();
    }
    else if (data == 'G')
    {
      ForwardLeft();
    }
    else if (data == 'I')
    {
      ForwardRight();
    }
    else if (data == 'H')
    {
      BackLeft();
    }
    else if (data == 'J')
    {
      BackRight();
    }
    else {
      Stop();
    }

  }

}

void Forward() {
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);
  digitalWrite(EN1, HIGH);
  digitalWrite(EN2, HIGH);


}

void Back() {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
  digitalWrite(EN1, HIGH);
  digitalWrite(EN2, HIGH);
}

void Left() {
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
  digitalWrite(EN1, HIGH);
  digitalWrite(EN2, HIGH);
}

void Right() {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);
  digitalWrite(EN1, HIGH);
  digitalWrite(EN2, HIGH);

}
void Stop() {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, LOW);
  digitalWrite(EN1, LOW);
  digitalWrite(EN2, LOW);
}

void ForwardLeft() {
  analogWrite(EN1, 255); //speed 0 - 255
  analogWrite(EN2, 50); //speed 0 - 255
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);
}
void ForwardRight() {
  analogWrite(EN1, 50); //speed 0 - 255
  analogWrite(EN2, 255); //speed 0 - 255
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);
}
void BackLeft() {
  analogWrite(EN1, 50); //speed 0 - 255
  analogWrite(EN2, 255); //speed 0 - 255
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
}
void BackRight() {
  analogWrite(EN1, 255); //speed 0 - 255
  analogWrite(EN2, 50); //speed 0 - 255
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
}