/*-----------------------------------------------------------------
 *           Serial communication with the Arduino 
 *   (Like, for example - receiving data from Raspberry Pi)
 * Setup: Wire a servo motor to +5v, Gnd and pin 6
 -----------------------------------------------------------------*/
 #include <Servo.h>

char inData;        // variable for storing received serial data
int convertData;    // variable or storing data converted into integers
int ledPin = 13;    // variable for LED pin number
int servoPin = 6;   // variable for servo pin number
Servo myservo;      // create servo object to control a servo
// twelve servo objects can be created on most boards

 void setup(){
    Serial.begin(9600);
    pinMode(ledPin, OUTPUT);     // set pin Mode for lighting LED
      myservo.attach(servoPin);  // attaches the servo on pin 6 to the servo object
 }

void loop(){
    if (Serial.available() > 0){    // if serial data (RPi to Arduino)
       inData = Serial.read();      // read it, store in inData
       delay(15);
       convertData = (int)inData - 48; // Convert char into an integer
       Serial.println(convertData);    // print it in the serial monitor
        if(convertData == 0) {         // If data is a "0"
         digitalWrite(ledPin, HIGH);   // LED "on"
         myservo.write(180);           // tell servo to go to position 180 
          delay(10);                   // delay to read LCD characters  
            } else {         
         digitalWrite(ledPin, LOW);    // LED "off"                                
         myservo.write(10);            // tell servo to go to position 0
          delay(10);                   // delay to read LCD characters 
    } 
  } 
}