The model provides an introduction to message technology: From a simple light signal to a counting signal to the transmission of a coded message. Subroutines („custom blocks“ in Scratch) are introduced. The task is particularly suitable for working in a group of two with one transmitter and one receiver unit.
How can you transmit a signal? How do you encode a message? What are subroutines and how do you use them in Scratch? How can you measure time in Scratch?