![]() Serial.begin() needs to go in the setup(). ![]() 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 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”. I have an Arduino Uno project which is recording student attendance using fingerprint sensor. The print() function is part of a library called the Serial library. data: the data to print (char, byte, int, long, or string) BASE: (optional) the base in which to print numbers: BIN for binary (base 2), DEC for decimal (base 10), OCT for octal (base 8), HEX for hexadecimal (base 16). 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. It's disabled in the Arduino IDE, presumably because it tends to increase the runtime memory requirements of the program. 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. In a typical C++ program, you would use the typeid operator, like this: std::cout << typeid (myVar).name () However, that requires a compiler feature called Runtime Type Information (RTTI). 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. Making statements based on opinion back them up with references or personal experience. Provide details and share your research But avoid Asking for help, clarification, or responding to other answers. Very often, when you are developing an Arduino sketch, what you end up coding does something differently than what you expected it to do. Thanks for contributing an answer to Arduino Stack Exchange Please be sure to answer the question. The other big reason to send information to a computer display using the Serial.print() function is for developing and debugging Arduino sketches.
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