This is a modern take on tying two cups together to create a secret two-way intercom. But without the string! In this guide we'll show you how you can use two CLUE boards to talk to each other wirelessly over Bluetooth Low Energy (BLE).

Once the boards find each other, you can send messages back and forth one letter at a time. Morse Code is used as a way to enter the letters using only the two buttons. There's even a helpful Morse Code cheat sheet on the display!

The code is written in CircuitPython using newly available BLE features. It's a great way to learn or practice your Morse code, and a great way to send secrets around the classroom or camp.

NOTE: You'll need at least two CLUE boards for this guide.

Animated GIF showing CLUE board  displaying data from the many on-board sensors.
Do you feel like you just don't have a CLUE? Well, we can help with that - get a CLUE here at Adafruit by picking up this sensor-packed development board. We wanted to build some...
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This guide was first published on Mar 04, 2020. It was last updated on Jul 23, 2024.

This page (Overview) was last updated on Mar 08, 2024.

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