pxt-calliope/docs/projects/telegraph.md

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# telegraph activity
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![](/static/mb/lessons/telegraph-0.png)
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### ~avatar
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Build a telegraph between two micro:bits to communicate with your friends!
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### ~
## Duration: ~30 minutes
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## Materials
* micro:bit, battery holder and 2 AAA batteries
* Crocodile clips
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## Activities
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* [Making the circuit](/projects/telegraph/making)
* [Manual telegraph](/projects/telegraph/manual-telegraph)
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### ~button /projects/telegraph/making
Let's get started!
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### ~