How to create inductive loop sensor that can output an analog signal?

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cent88

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I'm not familiar with inductor. I need this metal sensor for my project. Unfortunately all info I got from the internet are all about the whole device, which is connected to the buzzer.

Any one here has any idea or schematic on how to create inductive loop sensor that can output an analog signal or just high/low signal to micro-controller?
 

Some more info would help us to give you a useful answer.
 

i will be using it for car park system to sense the car at the entrance.
the sensor continuously send the signal to microcontroller until the car leave the sensor.
 

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