People counter using ulrasonic sensor

how to make people counter using arduino program

How would the counter work? Would it be a device that someone presses a button on to help them count people, or is it going to be something people have to walk through to be counted?

Should it only count up, or should it also count people leaving (reduce the count)?

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I am also need this ans because I gonna do this project so i need idea

Hey lisiny, as bhofman explained above, it’s important to first decide what you want the project to do. Once you define the logic, it will be much easier for us to help you with the technical details.
Good luck!