Question

I am doing a sample hello world on arduino uno. here is my sample code.

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  Serial.println('Hello world');
}

This is giving me weird output on the serial monitor (with 9600 BR). I get a continuous output of the following:

27748
27748
27748

Why is that?

Answer 1

Try changing: Serial.println('Hello world'); to Serial.println("Hello world");
I haven’t played around with my Arduino in a few months, but I think you need double quotes and not single quotes for strings.