arduino-control-test.ino

// Assign each of our input pins to an integer variable
int LED_one = 13;

void setup() {
    Serial.begin( 9600 );
    pinMode( LED_one, OUTPUT );
}

void loop() {

    while (Serial.available() == 0); //wait until the serial connection is open
        int COM_value = Serial.read() - '0'; //read from the serial connection; the - '0' is to cast the values as the int and not the ASCII code
        Serial.println(COM_value); //print to the console for testing

        if( COM_value == 1 ) { //LED #`1
            Serial.println("Received a 1 - ON");
            digitalWrite( LED_one, HIGH ); // HIGH VOLTAGE - TURNED ON
        }
        if( COM_value == 2 ) {
            Serial.println("Received a 2 - OFF");
            digitalWrite( LED_one, LOW ); // LOW VOLTAGE - TURNED OFF
        }
}