String Object Constructors

The String object allows you to manipulate strings of text in a variety of useful ways. You can append characters to Strings, combine Strings through concatenation, get the length of a String, search and replace substrings, and more. This tutorial shows you how to initialize String objects.

String stringOne = "Hello String";                      // using a constant String
String stringOne =  String('a');                        // converting a constant char into a String
String stringTwo =  String("This is a string");         // converting a constant string into a String object
String stringOne =  String(stringTwo + " with more");   // concatenating two strings
String stringOne =  String(13);                         // using a constant integer
String stringOne =  String(analogRead(0), DEC);         // using an int and a base
String stringOne =  String(45, HEX);                    // using an int and a base (hexadecimal)
String stringOne =  String(255, BIN);                   // using an int and a base (binary)
String stringOne =  String(millis(), DEC);              // using a long and a base
String stringOne =  String(5.698, 3);                   // using a float and the decimal places

All of these methods are valid ways to declare a String object. They all result in an object containing a string of characters that can be manipulated using any of the String methods. To see them in action, upload the code below onto an Arduino board and open the Arduino IDE serial monitor. You'll see the results of each declaration. Compare what's printed by each println() to the declaration above it.

Step 1: What You Need?

1 x Arduino Board ( Arduino UNO R3 used in this tutorial.)
1 x USB Type-B Cable 


Optional 

Arduino Uno R3 Acrylic Transparent Casing

Arduino Compatible UNO Ultimate Starter Kit / Learning Kit

Don't have components? Don't worry. Just click the component's name. 

Step 2: Build Your Circuit.

There is no circuit for this example, though your board must be connected to your computer via USB and the serial monitor window of the Arduino Software (IDE) should be open.

Step 3: Upload The Code.

1. Select the Arduino board type: Select Tools >> Board >> Select your correct Arduino board used.

2. Find the port number by accessing device manager on Windows. See the section Port (COM&LPT) and look for an open port named "Arduino Uno (COMxx)". If you are using a different board, you will find a name accordingly. What matters is the xx in COMxx part. In my case, it's COM3. So my port number is 3.

Select the right port: Tools >> Port >> Select the port number.

3. You can find this code in the example of Arduino IDE.

Select File >> Examples >> 08. Strings >> StringConstructors

Click press the "upload" button (see the button with right arrow mark).

Download:

Arduino IDE

Sources:https://www.arduino.cc/en/Tutorial/StringConstructors

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Author & Editor

My Robot Education Sdn. Bhd. (Robotedu.my) was founded in 2015 as the first robotics education centre in Malaysia to provide Arduino-based robotics courses for youths. Our vision is to be able to provide robotics education to every youth in Malaysia.