Lights and Drums: an unplugged-style activity

[george boukeas]

Hello everyone. I have just received an e-mail from a teacher who
tried the activity at his school and sent me these pictures. I find
them really interesting so I thought I might share them. This
particular school is for "technical education" so they built their own
communication devices for implementing the activity. The device with
the button uses both a light and a buzzer, while the second one was
used for sending morse code with a buzzer.