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Cicada and Dragonfly in the Tree

Code a dragonfly that is happy to land on the tree and a cicada that sings from the tree.

Build a cicada and a dragonfly in a tree.

Cicada and Dragonfly in the Tree
Finished model

Blocks needed

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How to build 25 steps

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Coding mission

On a hot summer day, a tired dragonfly lands on a tree. Code the cicada in the tree to greet the dragonfly.

Blocks and their jobs

  • Light Sensor BlockLeaf
  • LED BlockDragonfly
  • Sound BlockCicada

Let's think

Inside a sensor block, you can put any action blocks — in any order and of any kind.

  • Motor, LED, sound or Master Block: any of these can run when the sensor’s condition is met.
Show the solution

Before the dragonfly lands on the leaf (bright – nothing covers the light sensor block), it shows no expression. When it lands (dark – the light sensor block is covered), it smiles, and the cicada sings “Mi, Sol, Sol.”

Mission complete!

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