Seeeduino V3.0 (Atmega 328P) and Rotary Angle Sensor Mystery Message

Question

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?

Answer 1

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...