Compilation error: 'HCSR04' does not name a type; did you mean 'UCSR0A'?
I get this error when downloading the ultrasonic sensor code with the shared flag in the library, and it is the last experience of many solutions. What should I do?
read How to get the best out of this forum and post accordingly (including code with code tags and necessary documentation for your ask like your exact circuit and power supply, links to components etc).
as it's not an IDE 1.x question, I moved it to a better category. In the future please pay attention and select an appropriate category.
to your question, you are likely missing a library but it's just a guess
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You must show this code.
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Time to get my eyes fixed, I cannot follow your code that you posted using code tags, all I see is a white space.
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