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Merge pull request #377 from per1234/fix-variable-name

Correct variable name reference in "Writing a Library for Arduino"

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content/learn/08.contributions/03.arduino-creating-library-guide
- arduino-creating-library-guide.md

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`@@ -48,7 +48,7 @@ void dash()`
`48`	`48`
`49`	`49`	`If you run this sketch, it will flash out the code for SOS (a distress call) on pin 13.`
`50`	`50`
`51`		-The sketch has a few different parts that we'll need to bring into our library. First, of course, we have the `dot()` and `dash()` functions that do the actual blinking. Second, there's the ledPin variable which the functions use to determine which pin to use. Finally, there's the call to `pinMode()` that initializes the pin as an output.
	`51`	+The sketch has a few different parts that we'll need to bring into our library. First, of course, we have the `dot()` and `dash()` functions that do the actual blinking. Second, there's the `pin` variable which the functions use to determine which pin to use. Finally, there's the call to `pinMode()` that initializes the pin as an output.
`52`	`52`
`53`	`53`	`Let's start turning the sketch into a library!`
`54`	`54`

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