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Making a countdown timer

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Nisushie

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Hi I am very new with this. So if I made a mistake anywhere please forgive me.

I need help with a project that I am working on. I am quite new to electrical and electronics so there are lots of things that I may not know.

This is the scenario. A carpark with 1 hour limit. Meaning, the car parks into a lot. Sensor detects a car there. Activate timer to countdown 1 hour to 0. Then send a signal to a screen to show that the car already reach the 1 hour limit.

I need to know, what kind of timer is best used for this and how to connect.
 

Using some kind of microcontroller will probably be best since it would need to take interrupt inputs from the sensors
 
hmm I can vaguely remember.. Atmel 8051 microcontroller..
eklikeroomys, can you tell me a few tips if i were to use micro controllers?
 

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