Lesson 3 of 8
Give a pattern a meaning
Show on a big screenThree switches make eight patterns. None of them means anything yet.
Step 1 of 4
- Two patterns: down up up, and up up down.
- Look each one up in the table.
- Down up up reads: O.
- Up up down has no line. Nothing comes out.
A code is an agreed table of pattern and meaning. Both ends hold the same copy. The two ends are the sender and the reader. Each pattern has its own line in the table.
| Pattern | Letter |
|---|---|
| down down down | A |
| down down up | M |
| down up down | N |
| down up up | O |
| up down down | G |
| up down up | T |
Two patterns have no line. Send one and nothing comes out.
A code can carry more than letters. A picture is a grid of coloured dots. A table can give each colour a number.
Set the switches. Make the letter.
Loading lab…
Try the lab to finish this lesson.