When it breaks

Nothing works the first time. That's the job.

Broken code is not a verdict on you. It is information. Every programmer you admire spends most of their day with something not working yet.

The move is the same as in module 1: go big, then go small. Find the smallest piece that misbehaves, test just that, and fix it.

Try this: break your sketch on purpose. Remove a bracket, rename a variable. Read the error and fix it.

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