// Program: Moving a 4-wheeled (motors) Robot Operated via Bluetooth

int m1=8;
int m2=9;
int m3=10;
int m4=11;

void setup()
{
    Serial.begin(9600);
    pinMode(m1,OUTPUT);
    pinMode(m2,OUTPUT);
    pinMode(m3,OUTPUT);
    pinMode(m4,OUTPUT);
}
void loop()
{
    if(Serial.available())
    {
        int i=Serial.read();
        if(i=='2')      // FORWARD
        {
            digitalWrite(m1,HIGH);
            digitalWrite(m2,LOW);
            digitalWrite(m3,HIGH);
            digitalWrite(m4,LOW);
        }
        if(i=='8')      // BACKWARD
        {
            digitalWrite(m1,LOW);
            digitalWrite(m2,HIGH);
            digitalWrite(m3,LOW);
            digitalWrite(m4,HIGH);
        }
        if(i=='3')      // RIGHT
        {
            digitalWrite(m1,LOW);
            digitalWrite(m2,LOW);
            digitalWrite(m3,HIGH);
            digitalWrite(m4,LOW);
        }
        if(i=='1')      // LEFT
        {
            digitalWrite(m1,HIGH);
            digitalWrite(m2,LOW);
            digitalWrite(m3,LOW);
            digitalWrite(m4,LOW);
        }
        if(i=='5')      // STOP
        {
            digitalWrite(m1,HIGH);
            digitalWrite(m2,HIGH);
            digitalWrite(m3,HIGH);
            digitalWrite(m4,HIGH);
        }
        if (i=='4')    // LEFT 360
        {
            digitalWrite(m1,HIGH);
            digitalWrite(m2,LOW);
            digitalWrite(m3,LOW);
            digitalWrite(m4,HIGH);
        }
        if(i=='6')      // RIGHT 360
        {
            digitalWrite(m1,LOW);
            digitalWrite(m2,HIGH);
            digitalWrite(m3,HIGH);
            digitalWrite(m4,LOW);
        }
        if(i=='7')      // Back-LEFT
        {
            digitalWrite(m1,LOW);
            digitalWrite(m2,LOW);
            digitalWrite(m3,LOW);
            digitalWrite(m4,HIGH);
        }
        if(i=='9')      // Back-RIGHT
        {
            digitalWrite(m1,LOW);
            digitalWrite(m2,HIGH);
            digitalWrite(m3,LOW);
            digitalWrite(m4,LOW);
        }
        else
        {
            Serial.write("Unavailable");
        }
    }
}