Serial output in Arduino

The sketch's voice: begin at a baud rate, print lines.

// Serial is the sketch's voice; the monitor listens at the same baud.
void setup() {
  Serial.begin(9600);
  Serial.println("Greenhouse controller v1");
}

void loop() {
  Serial.print("Uptime seconds: ");
  Serial.println(millis() / 1000);
  delay(1000);
}

How it works

Serial.begin(9600) opens the port; the monitor must match.
print and println differ by the newline.
millis() / 1000 turns the uptime clock into seconds.

Keywords and builtins used here

Serial
begin
delay
loop
millis
print
println
setup
void

The run, in numbers

Lines: 11
Characters to type: 248
Tokens: 54
Three-star pace: 70 tpm

At the three-star pace of 70 tokens a minute, this run takes about 46 seconds.

Type this snippet

Step 2 of 3 in The sketch, step 2 of 27 in Language basics.

← Previous Next →