String Character Analysis

In this example we use the operators that allow us to recognise the type of character we are dealing with. It is useful to check if a character is ASCII, or is upper case, or numeric, or it is a punctuation mark and so forth. The options available cover a variety of situations and this is demonstrated in the sketch below. Every character sent to the board through the serial monitor of the Arduino Software (IDE) is analysed by the sketch that returns all the information it was able to find. A single character may trigger more than one condition and therefore you may get multiple answers for a single entry.

The available operators are:

  - isAlphaNumeric()
    it's alphanumeric

  - isAlpha()
    it's alphabetic

  - isAscii()
    it's ASCII

  - isWhitespace()
    it's whitespace

  - isControl()
    it's a control character

  - isDigit()
    it's a numeric digit

  - isGraph()

    it's a printable character that's not whitespace

  - isLowerCase()
    it's lower case

  - isPrintable()
    it's printable

  - isPunct()
    it's punctuation

  - isSpace()
    it's a space character

  - isUpperCase()
    it's upper case

  - isHexadecimalDigit()
    it's a valid hexadecimaldigit (i.e. 0 - 9, a - F, or A - F)

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 >> CharacterAnalysis

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

Open the serial monitor window of the Arduino Software (IDE) and type in a single character at a time, then press Send to get a report about that specific character.  

Download:

Arduino IDE

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

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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.