Sample Codes for Direction Tilt Robot with Bluetooth Receiver.

Receiver.ino

int SPEED_MOTOR = 150;
int state = 0;
void setup() {
  //MOTOR PINS
  pinMode(8, OUTPUT); //dirmotor1
  pinMode(9, OUTPUT); //spdmotor1
  pinMode(10, OUTPUT);     //spdmotor2
  pinMode(11, OUTPUT);     //dirmotor2

  Serial.begin(9600);
}
void loop() {
  if (Serial.available() > 0){
    state = Serial.read();
  }

  if(state == '3'){
    STOP();
  }

  else if(state == '0'){
    FORWARD();
  }

  else if(state == '2'){
    TURN_RIGHT();
  }

  else if(state == '1'){
    TURN_LEFT();
  }
 
}





void FORWARD() {
  digitalWrite(8, HIGH);
  analogWrite(9, SPEED_MOTOR);
  analogWrite(10, SPEED_MOTOR);
  digitalWrite(11, HIGH);
}
void TURN_RIGHT() {
  digitalWrite(8, HIGH);
  analogWrite(9, SPEED_MOTOR);
  analogWrite(10, SPEED_MOTOR);
  digitalWrite(11, LOW);
}
void TURN_LEFT() {
  digitalWrite(8, LOW);
  analogWrite(9, SPEED_MOTOR);
  analogWrite(10, SPEED_MOTOR);
  digitalWrite(11, HIGH);
}
void STOP() {
  //digitalWrite(8, HIGH);
  analogWrite(9, 0);
  analogWrite(10, 0);
  //digitalWrite(11, HIGH);
}