#include <Servo.h>

Servo servo;

const int pinServo = 8;
const int led = 7;
const int relay = 6;
boolean on = LOW;
boolean off = HIGH;


void setup() {
  Serial.begin(9600);
  servo.attach(pinServo);
  pinMode(led, OUTPUT);
  pinMode(relay, OUTPUT);
  digitalWrite(relay, off);
}

void loop() {
  if(Serial.available()>0){
    char data = Serial.read();
    switch(data){
      case '0' :
        digitalWrite(led, LOW);
        break;
      case '1' :
        digitalWrite(led, HIGH);
        break;
      case '2' :
        servo.write(90);
        break;
      case '3' :
        servo.write(180);
        break;
      case '4' :
        digitalWrite(relay, off);
        break;
      case '5' :
        digitalWrite(relay, on);
        break;
      default:
        break;
    }
  }
}