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Up/down counter ICs exist, e.g. CD4510 or CD4516. You can use several of those, depending on how many digits your counter will have. Decoder ICs will probably be needed too, according to the type of display to be used. You will also need means such as switches to start/stop/reset the count and select the count direction.
Break the problem down into manageable stages. Consider e.g. :I have no idea where to start
How can you program one successfully if you don't know how it works? I suggest you get hold of any datasheet or other info source for the board and study it thoroughly. Once you know its features and limitations you will be better able to see how it can be used in your project. The right information is one of the most important tools you need for success.but I'm not sure howthey work iI know how to program them
I think you should go with the basic electronics using counter chips etc... that will be very helpful for understanding the digital electronics...I know how to write a program but not how the board works
The up/down counter I got is a 4516, I'm using light sensors to determine weather their leaving
Exactly how do the sensors determine whether the person is entering or leaving?The up/down counter I got is a 4516, I'm using light sensors to determine weather their leaving