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  • You need to select your code and tap the {} (code formatting) button. I did it for you. Commented May 12, 2019 at 19:29
  • 3
    Of course it's undeclared. The variable is in setup. It's not in loop. Commented May 12, 2019 at 19:30
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    Because the variable is only valid, where it is declared, to use the official term: it's scope. When the program moves out of the scope of this variable, it will get thrown away and be no longer available. You can declare it in global scope, meaning outside of any function Commented May 12, 2019 at 19:32
  • This is more a question about C/C++, not about Arduino Commented May 12, 2019 at 19:33
  • @chrisl true, but the OP doesn't know enough to know where to ask the question. We all have to start somewhere. I just wish people would do some self-study before running to the internet looking for somebody else to answer their questions for them. Commented May 12, 2019 at 19:35