serialArd

serial.ino

#include <Servo.h>

Servo myservo;

void setup() {
  Serial.begin(9600);
  myservo.attach(9);
}

void loop() {
  if(Serial.available() == 2){
    char command = Serial.read();
    int value = Serial.read();
    if(command == 's') { 
      myservo.write(value);
    }
    if(command == 'l') {
      // control lights
    }
  }
}