up / down counter

Thread Starter

crossfire

Joined Oct 21, 2009
2
i have a project to design a parking lot system ...
i need to design a counter that start from 30 and go down to 0 ... using 7-segment display ....
it will go down by pressing a button eg: if it is 30 i will press button, and it will go down to 29 (* a car going in * ) ,and i need another button to count 1 up (* a car going out *) and when the counter become 0.
another 4 7-segment will display F U L L ...
can anyone help me with that ???
thx
 
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