• Arduino Format String
• Arduino Serial Print Examples
• Arduino Print To Serial Monitor

1. Aug 16, 2013  First of all, since you are coding for an Arduino and the data that will be processed by a scanf is coming thru a Serial port, then first code a routine to read a serial port for the data that you need. You will find that this is NOT a simple task, and that you will end up with routines to read ASCII characters of integers, letters, etc.
2. Serial object works much the same way as on a regular Arduino. Apart from hardware FIFO (128 bytes for TX and RX) HardwareSerial has additional 256-byte TX and RX buffers. Apart from hardware FIFO (128 bytes for TX and RX) HardwareSerial has additional 256-byte TX and RX buffers.
3. Use Serial.print to display Arduino output on your computer monitor: Part 2. If you type = ‘312’, then the compiler would consider last two characters only because the size of int is 2 bytes in Arduino IDE.
4. From the Arduino site for Serial.write and Serial.print: Writes binary data to the serial port. This data is sent as a byte or series of bytes; to send the characters representing the digits of a number use the print function instead. Prints data to the serial port as human-readable ASCII text.
5. Arduino – Printing Float values to the Serial Port 2013/01/20 10:34 am / 1 Comment / Bertus Kruger I found that printing floating is a bit harder than it needs to be.
6. Using dtostrf function A better solution is to use the dtostrf function. It it is more flexible and works well also with negative numbers. These two lines of code will write a string into the buffer with strcpy function and the append the float value using the dtostrf function.

Open the Serial monitor in the Arduino IDE (Ctrl+Shift+M). Ensure that you have set the baud rate in the Serial monitor to 9600. You should see the following output: The sprintf function requires that you have a character array to store the output.

In many cases while using an Arduino, you will want to see the data being generated by the Arduino. One common method of doing this is using the Serial.print() function from the Serial library to display information to your computer’s monitor.

In this week’s episode, we will talk about the intricacies of the Serial.print() function.

This is the first part, of a two part series on the Serial.print() function. Here are the specific topics we will cover in this lesson:

Arduino Format String

• Why would you want to use the Serial.print() function?
• A brief overview of the Serial library
• The basic use of the Serial.print() function

Why Would You Want to Use the Serial.print() Function?

You may know that a function is a programming tool – it performs a specific task for you. The Serial.print() function’s task is to send information from your Arduino to your computer, so you can see the value displayed on your computer’s monitor.

There are an endless number of reasons you may want to send information from the Arduino to a computer display, but two reasons really stand out to me:

The first reason is being able to see information that you are generating with your Arduino.

For example, if you have a temperature sensor hooked up to your Arduino and you want to see the value that the temperature sensor is recording, then you can use the Serial.print() function to send the data to a computer monitor via the USB cable. If you open up the serial monitor window (Tools > Serial Monitor), you will see the values streaming in from the Arduino.

The other big reason to send information to a computer display using the Serial.print() function is for developing and debugging Arduino sketches.

Very often, when you are developing an Arduino sketch, what you end up coding does something differently than what you expected it to do. Maybe you have a variable that gets incremented every so often and blinks an LED when it reaches a threshold. When you upload the code to the Arduino, you notice that the LED is blinking more often than it should.

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.

A Brief Overview of the Serial Library

We can’t talk about the Serial.print() function, without briefly talking about the Serial library.

Generally speaking, a library is simply a collection of functions that all have something in common.

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The print() function is part of a library called the Serial library. Now, it’s not cereal like Cheerios or Captain Crunch we’re talking about – it’s serial as in “one after another”.

Arduino Serial Print Examples

The serial library allows us to interface the Arduino with other hardware, like a computer.

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. Serial.begin() needs to go in the setup().

Now for reasons beyond the scope of this discussion, it is convenient to use the number 9600 in the Serial.begin() function. The value 9600 specifies the baud rate. The baud rate is the rate at which information will pass from the Arduino to the computer, or in the other direction.

The Basic Use of the Serial.print() Function

Arduino Print To Serial Monitor

Let’s talk about how to use the Serial.print() function.

Say we have a sketch. This sketch has a variable called coolFactor.

I want to be able to monitor the value of the coolFactor variable – that is, I want it displayed on my computer screen. A perfect use for the Serial.print() function!

The first thing we must do in the Arduino sketch is begin serial communications. Like we just said, we use the Serial.begin() function and place it within the setup() of the sketch.

Now in the loop(), if I want to display coolFactor’s value with print(), I simply type Serial.print() and in the parenthesis I type the variable name.

If we upload this sketch to the Arduino, the value of coolFactor will be sent to the serial port every time through the loop(). In the Arduino IDE, if you open up the serial monitor window , you will see the values streaming down.

If you enjoyed this lesson, I welcome you to join 1000’s of students who have enjoyed our free Arduino Crash Course – it’s a 19 part video training series on using Arduino (You can sign up below).

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