user1172: I am attempting to do a simple example with the Rotary Angle Sensor.
Here is my development environment:

Visual Studio 2013 Premium 
Arduino Debug Tool


Board setup (Simple as can be single analog input):

Code:
const int ROTARYSENSOR = A0; 

void setup()
{
    Serial.println("Setup Start...");
    Serial.begin(9600); //Set the serial communication frequency at 9600 bits per second

    pinMode(ROTARYSENSOR, INPUT);

    Serial.println("Setup End!");
}

void loop()
{
    Serial.println("Loop Start...");

    int value = analogRead(ROTARYSENSOR);
    Serial.println(value); //display on serial monitor
    delay(1000); //wait 1000ms before printing next value

    Serial.println("Loop End!");
}

Issue:
I have a single solution with multiple projects as my sensor playground. All other projects I have so far work flawlessly no issues.  Although with this project (RotaryAngleSensor) I am getting a strange message.
I am not seeing any of the Serial.println() messages. What is printed to the screen after a good 30 seconds is S?
Does anyone know what could be returning this S? to the standard output?

user612: One problem is that you try to generate serial output before you initiate Serial.  This could have odd results beyond just making that message fail.
Serial.println("Setup Start...");
Serial.begin(9600);

Should be
Serial.begin(9600);
Serial.println("Setup Start...");

And of course your posted code never reads the sensor...

1172: <p>I am attempting to do a simple example with the Rotary Angle Sensor.</p>

<p><strong>Here is my development environment:</strong></p>

<ul>
<li><a href="http://www.visualstudio.com/en-us/products/visual-studio-premium-with-msdn-vs.aspx" rel="nofollow noreferrer">Visual Studio 2013 Premium</a> </li>
<li><a href="http://www.visualmicro.com/page/Arduino-Debug-In-Visual-Studio.aspx" rel="nofollow noreferrer">Arduino Debug Tool</a></li>
</ul>

<p><img src="https://i.stack.imgur.com/oyOS4.png" alt="Visual Studio Solution and Projects"></p>

<p><strong>Board setup (Simple as can be single analog input):</strong>
<img src="https://i.stack.imgur.com/dBgoO.jpg" alt="Seeeduino V3 Setup"></p>

<p><strong>Code:</strong></p>

<pre><code>const int ROTARYSENSOR = A0; 

void setup()
{
    Serial.println("Setup Start...");
    Serial.begin(9600); //Set the serial communication frequency at 9600 bits per second

    pinMode(ROTARYSENSOR, INPUT);

    Serial.println("Setup End!");
}

void loop()
{
    Serial.println("Loop Start...");

    int value = analogRead(ROTARYSENSOR);
    Serial.println(value); //display on serial monitor
    delay(1000); //wait 1000ms before printing next value

    Serial.println("Loop End!");
}
</code></pre>

<p><strong>Issue:</strong></p>

<p>I have a single solution with multiple projects as my sensor playground. All other projects I have so far work flawlessly no issues.  Although with this project (RotaryAngleSensor) I am getting a strange message.</p>

<p>I am not seeing any of the Serial.println() messages. What is printed to the screen after a good 30 seconds is <strong><em>S?</em></strong></p>

<p>Does anyone know what could be returning this S? to the standard output?</p>
 612: <p>One problem is that you try to generate serial output <strong>before</strong> you initiate Serial.  This could have odd results beyond just making that message fail.</p>

<pre><code>Serial.println("Setup Start...");
Serial.begin(9600);
</code></pre>

<p>Should be</p>

<pre><code>Serial.begin(9600);
Serial.println("Setup Start...");
</code></pre>

<p>And of course your posted code never reads the sensor...</p>
