updated lessons

docs/reference/js/lessons/ornament-chain.md

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-# ornament chain lesson
-
-display beautiful images on the BBC micro:bit #var #pause #docs
-
-## Topic
-
-Telegraph
-
-## Quick Links
-
-* [activity](/microbit/lessons/ornament-chain/activity)
-
-## Class
-
-Year 7
-
-## Prior learning/place of lesson in scheme of work
-
-Learn how to convert your BBC micro:bit into a telegraph using a second BBC micro:bit as well as pin P1, P2, 3V, GND, and crocodile clips (or spring clips). The connect BBC micro:bit uses pins P1, P2, 3V, GND.
-
-## Objectives
-
-* learn how to setup the BBC micro:bit with crocodile clips
-* learn how to telegraph to another BBC micro:bit
-