Controlling two servos via pc using mouse arduino
<p>I want to control two servos via PC, using a mouse x-y coordinates. x-y coordinates of the cursor is sent to the serial port:</p>

<p>For the arduino part, I am getting 6 character string and dividing it into 2 parts. Then these parts are converted into integer value and send to arduino pins to set servo position:</p>

<pre><code> #include &lt;Servo.h&gt; 
    String readString, servo1, servo2;
    Servo myservo1;  // create servo object to control a servo 
    Servo myservo2;

    void setup() {
    Serial.begin(9600);
    myservo1.attach(6);  //the pin for the servo control 
    myservo2.attach(7);
    }

    void loop() {}

    void serialEvent() {
    while (Serial.available()) {
    delay(2);  
    if (Serial.available() &gt;0) {
     char c = Serial.read();  //gets one byte from serial buffer
     readString += c; //makes the string readString
    } 
    }

    if (readString.length() &gt;0) {
     Serial.println(readString); //see what was received

     // expect a string like 07002100 containing the two servo positions      
     servo1 = readString.substring(0, 3); //get the first three characters
     servo2 = readString.substring(3, 6); //get the next three characters 

     Serial.println(servo1);  //print ot serial monitor to see results
     Serial.println(servo2);

     int n1; //declare as number  
     int n2;

     char carray1[6]; //magic needed to convert string to a number 
     servo1.toCharArray(carray1, sizeof(carray1));
     n1 = atoi(carray1); 

     char carray2[6];
     servo2.toCharArray(carray2, sizeof(carray2));
     n2 = atoi(carray2); 

     myservo1.write(n1); //set servo position 
     myservo2.write(n2);
   readString="";
 } 
}
</code></pre>

<p>However, the code is very slow. I need to move the mouse very slowly to make servos move. Instant movement from let's say from 50 degree to 170 takes 1 second to move the servo. Could you offer a better option to control two servos in this case?</p>

<p>Controlling only one servo works very well, and it moves servo instantly without any lags:</p>

<pre><code>#include &lt;Servo.h&gt;

Servo x;

int xval;
void setup() {
  Serial.begin(9600);
  x.attach(9);
}

void loop() {

}
void serialEvent() {
  xval = Serial.parseInt();
  if(xval!=0) {
    x.write(xval);
  }
}
</code></pre>

<p>Code in C#: </p>

<pre><code>public partial class Form1 : Form
    {
        SerialPort port;
        public Form1()
        {
            InitializeComponent();
            init();
        }
        private void init()
        {
            port = new SerialPort();
            port.PortName = "COM1";
            port.BaudRate = 9600;
            //porty = new SerialPort();

            try
            {
                port.Open();
            }
            catch (Exception e1)
            {

                MessageBox.Show(e1.Message);
            }
        }
        int x = 0, y = 0;
        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);
            Graphics g = CreateGraphics();
            Pen p = new Pen(Color.Navy);
            Pen erase = new Pen(Color.White);
            x = e.X; y = e.Y;
            double curWidth = this.Width / 180;
            double x2 = Math.Round(x / curWidth);

            double curHeight = this.Height / 180;
            double y2 = Math.Round(y / curHeight);

            label1.Text = x2.ToString(); label2.Text = y2.ToString();

            string valx = x2.ToString();
            string valy = y2.ToString();
            while(valx.Length &lt; 3)
            {
                valx = '0' + valx;
            }
            while(valy.Length &lt; 3)
            {
                valy = '0' + valy;
            }
            string valsum = valx+valy;
            label3.Text = valsum.ToString();
            if (port.IsOpen)
            {
                port.WriteLine(valsum);
            }
        }
    }
</code></pre>

<p>In the above code I am taking x and y coordinates and converting it to approx 180 range. After I join the values into one string to send it through serial port.</p>