![]() Serial.begin() needs to go in the setup(). So it basically, sends whatever text you want with a newline. In order for us to use the functions of the Serial library, we have to initiate serial communication – to do this we use the Serial.begin() function. The Serial.println() function is similar to the Serial.print() function with only one difference which is following the printed text with a carriage return character (ASCII 13, or ‘\r’) and a newline character (ASCII 10, or ‘ ’). The serial library allows us to interface the Arduino with other hardware, like a computer. Now, it’s not cereal like Cheerios or Captain Crunch we’re talking about – it’s serial as in “one after another”. The print() function is part of a library called the Serial library. Generally speaking, a library is simply a collection of functions that all have something in common. We can’t talk about the Serial.print() function, without briefly talking about the Serial library. You can look at the code until your eyes bleed, but actually visualizing the variable being incremented, to see its values every time through the loop() can help explain what is happening very quickly. When you upload the code to the Arduino, you notice that the LED is blinking more often than it should. ![]() Maybe you have a variable that gets incremented every so often and blinks an LED when it reaches a threshold. ![]() Very often, when you are developing an Arduino sketch, what you end up coding does something differently than what you expected it to do. This function performs the same as the Serial.print() function, with the difference that this function goes to the next line after. If you want to print variables on different lines, you can do that easily using the Serial.println() function in Arduino. Returns print () returns the number of bytes written, though reading that number is optional. Print Variable Values on Serial Monitor Using the Serial.println() Function in Arduino. See the list of available serial ports for each board on the Serial main page. Both NL & CR Send both \r and then in the end. Newline Send after the specified string (LF). Carriage Return Send \r in the end, after the specified string (CR). No Line Ending It means no additional character sent as line ending. The other big reason to send information to a computer display using the Serial.print() function is for developing and debugging Arduino sketches. Syntax Serial.print (val) Serial.print (val, format) Parameters Serial: serial port object. In the figure 1 shows the option for line ending character (near baud rate option).
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