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Character Sets

Overview
Flight Path
Learning Objectives
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 3 I can understand what a character set is.
 3 I can describe the ASCII amd Unicode character encoding methods:
 3 I can convert characters to character codes
 4 I can convert character codes to characters.

🏁 Learning Objective Character Sets


Learning Activity - Character Sets

A defined list of characters recognized by the computer hardware and software. Each character is represented by a number. The ASCII character set, for example, uses the numbers 0 through 127 to represent all English characters as well as special control characters.

ASCII decoder

Look at the example below

Use this program to encode or decode a character into ASCII characters or from ASCII numbers.

The ASCII character set uses codes of 7 bits, this allows the computer to store 128 different characters. This is enough for all of the upper-case letters and lower-case letters as well as the other common characters like numbers and punctuation marks on most keyboards. ASCII is only used for English language keyboards.

Learning Activity Tasks - Character Sets

Task 1: Spreadsheet Table

Create the table below in your excel spreadsheet and fill in the missing values

Use the program above and the ASCII table to help you find the denary values

Task 2: Decoding

See if you can decode the following

Task 3: More decoding

See if you can decode the following

Extension Task : Create an encoding device

In your spreadsheet create the following encoding device that can take any character from the keyboard and turn it into Denary, Binary and Hexadecimal

Now see if you can create your own encoded message


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Teacher Date: 2026-05-05


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