Students will work with Morse code. They will develop a program where the light on the Fable dongle can create Morse code signals.
To get started with this lesson, the teacher should have the following tools ready prior to class:
- Fable dongle
- Laptop PCs with Fable software installed
- Paper and pencil
- Assignment sheet
- Morse alphabet
Students are divided into groups of 3-4. Each group develops a Morse apparatus that uses the light on the Fable dongle. It must be possible to control the dongle’s light by pressing a single key. The code example provided assumes that the dongle’s light can be controlled by pressing one key, but there are many different ways to solve the task. Some groups may choose to use different colors on the dongle, depending on whether they want to signal a dot or a dash. The group takes turns so everyone tries to program and translate a Morse code. Students can also work together with other groups to send and receive messages.
Before starting the project, it is important that students understand four simple conventions used to distinguish between dots, dashes, letters, and words in messages.
To distinguish signals, we operate with the following conventions:
- Between dots and dashes there is a pause equivalent to a dot signal.
- The signal for a dash is equivalent to the length of three dots.
- Between Morse signals there is a pause equivalent to the length of a dash.
- A new word is indicated by a pause three times the length of a dash signal.
Formative assessment in which students receive direct feedback on their work with their Morse system.