about blink with millis

I am testing the BlinkWithoutDelay example:

I added : Serial.println("led on"); Serial.println("led off"); into the sketch, which never happened, why?
Thanks
Adam

// constants won't change. Used here to set a pin number:
const int ledPin =  LED_BUILTIN;// the number of the LED pin

// Variables will change:
int ledState = LOW;             // ledState used to set the LED

// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0;        // will store last time LED was updated

// constants won't change:
const long interval = 1000;           // interval at which to blink (milliseconds)

void setup() {

  Serial.begin(115200);
  // set the digital pin as output:
  pinMode(ledPin, OUTPUT);

  Serial.println("setup");
}

void loop() {
  // here is where you'd put code that needs to be running all the time.

  // check to see if it's time to blink the LED; that is, if the difference
  // between the current time and last time you blinked the LED is bigger than
  // the interval at which you want to blink the LED.
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;

    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW) {
      ledState = HIGH;

      Serial.println("led on");

    } else {
      ledState = LOW;

     Serial.println("led off");


    }

    // set the LED with the ledState of the variable:
    digitalWrite(ledPin, ledState);
   
  }

  Serial.println("TEST");
}

blinkwithmillis.JPG

Hi Adam,

do the Serial.println("setup"); and Serial.println("test"); lines print anything to the console?
You are not using the standard baudrate (9600), have you adjusted this setting in the serial monitor?

Best,
Bin

Binom:
Hi Adam,

do the Serial.println("setup"); and Serial.println("test"); lines print anything to the console?
You are not using the standard baudrate (9600), have you adjusted this setting in the serial monitor?

Best,
Bin

Thanks.
Yes, the Serial.println("setup"); and Serial.println("test"); executed. the other two didn't. I'll attache a picture into the main post. changed the baudrate.
Best

they are printing, but before you can see them the TEST has filled the screen because your running at 115200 and printing TEST every iteration of loop while the LED changes once every seconds

gcjr:
they are printing, but before you can see them the TEST has filled the screen because your running at 115200 and printing TEST every iteration of loop while the LED changes once every seconds

Thanks.
You are right.
Best