Serial
println()
Description
Prints data to the serial port as human-readable ASCII text followed by a carriage return character (ASCII 13, or '\r') and a newline character (ASCII 10, or '\n'). This command takes the same forms as Serial.print().
Syntax
Serial.println(val) 
Serial.println(val, format)
Parameters
val: the value to print - any data type
format: specifies the number base (for integral data types) or number of decimal places (for floating point types)
Returns
size_t (long): println() returns the number of bytes written, though reading that number is optional
Example:
  
/*
  Analog input
 reads an analog input on analog in 0, prints the value out.
 created 24 March 2006
 by Tom Igoe
 */
int analogValue = 0;    // variable to hold the analog value
void setup() {
  // open the serial port at 9600 bps:
  Serial.begin(9600);
}
void loop() {
  // read the analog input on pin 0:
  analogValue = analogRead(0);
  // print it out in many formats:
  Serial.println(analogValue);       // print as an ASCII-encoded decimal
  Serial.println(analogValue, DEC);  // print as an ASCII-encoded decimal
  Serial.println(analogValue, HEX);  // print as an ASCII-encoded hexadecimal
  Serial.println(analogValue, OCT);  // print as an ASCII-encoded octal
  Serial.println(analogValue, BIN);  // print as an ASCII-encoded binary
  // delay 10 milliseconds before the next reading:
  delay(10);
}
 
See also