arduino ethernet mouse control

/* attempting to program UNO with ethernet shield to accept commands from a client.
copied code almost exactly from mouse_test
added a power transistor to the external voltage regulator to power them up only when a client is connected. this stops the jitter of servos while idle.
PWM pins remaining after ethernetshield are 3, 5, 6, and 9.

*/
#include <Servo.h>
#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //mac address of eth shield
IPAddress ip (192,168,1,177); //permanent local IP address
IPAddress gateway (192,168,1,1); //router address
IPAddress subnet (255,255,255,0);
EthernetServer server(80); //using port 80

Servo servoX, servoY, servoA, servoB; //global variables:
int x1, y1, a1, b1;
const int servoPower = 2;
const int laserPin = 8;
const int buzzerPin = 7;
bool laser = false;
boolean alreadyConnected = false;

void setup() {
  servoX.attach(3);
  servoY.attach(5);
  servoA.attach(6);
  servoB.attach(6);
  servoX.write(90);
  servoY.write(90);

  pinMode(laserPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(servoPower, OUTPUT);
  digitalWrite(laserPin, LOW);

  Ethernet.begin(mac, ip, gateway, subnet);
  server.begin();

  Serial.begin(19200);
  Serial.print("Web server address:");
  Serial.println(Ethernet.localIP());
}

void loop() {
  a1 = servoA.read(); //gets actual position of servoA/B to send back to processing.
  b1 = servoB.read();
  EthernetClient client = server.available();
  if (client) {
    if (!alreadyConnected){
      client.flush();
      Serial.println("Disconnected.");
      alreadyConnected = true;
    }

    while (!client.connected()){
      digitalWrite(servoPower, LOW); //turns off servos and laser while no client is connected.
      laser = false;
      digitalWrite(laserPin, LOW);
    }

    while (client.connected()){
      digitalWrite(servoPower, HIGH); //powers on servos.
      delay(1);
      static int v = 0;
      if (client.available()>0){
        char ch = client.read();
        switch(ch) { //read incomming characters from processing and handle them case by case.
          case '0'...'9': //0-9 are coordinates.
            v = v *10 + ch - '0';
            break;

          case 'x': //signifies end of x coordinate.
            x1 = map(v, 0, 180, 160, 0);
            servoX.write(x1);
            v = 0;
            break;

          case 'y': //end of y coordinate.
            y1 = map(v, 0, 180, 10, 170);
            servoY.write(y1);
            v = 0;
            break;

          case 'l': //turns laser on or off.
            laserOnOff();
            if (laser){
              client.write("1"); //tells processing laser is on.
            }
            else if (!laser){
              client.write("0"); //tells processing laser is off.
            }
            break;

          case 'u': //moves servoA up and sends data back to processing to draw a position bar on screen if in range.
            a1 += 2;
            if (a1 >= 150){
              a1 = 150;
            }
            servoA.write(a1);
            if (a1 < 150){ //if servoA is in range, tell processing to move position bar.
              client.write("2");
            }
            break;

          case 'd':
            a1 -= 2;
            if (a1 <= 20){
              a1 = 20;
            }
            servoA.write(a1);
            if (a1 > 20){
              client.write("3");
            }
            break;

          case 'a':
            b1 -= 2;
            if (b1 <= 20){
              b1 = 20;
            }
            servoB.write(b1); //same for servoB:
            if (b1 > 20){
              client.write("4");
            }
            break;

          case 's':
            b1 += 2;
            if (b1 >= 160){
              b1 = 160;
            }
            servoB.write(b1);
            if (b1 < 160){
              client.write("5");
            }
            break;

          case 'b': //fires buzzer while mouse button is held.
            digitalWrite(buzzerPin, HIGH);
            break;

          case 'n':
            digitalWrite (buzzerPin, LOW);
            break;
        }
      }
    } client.flush();
  }
}

void laserOnOff(){ //turns laser on/off.
  if (laser == false){
    digitalWrite (laserPin, HIGH);
    laser = true;
  }
  else if (laser == true){
    digitalWrite(laserPin, LOW);
    laser = false;
  }
}