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Microwave Doppler radar Sensor used for car detection

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lavricalex

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In my project I want to use a Doppler radar Sensor in order to detect the presence of a car.
So I bought from e-bay the sensor.

**broken link removed**

I connected to the IF output the attached circuit figure (2 X LM324).

Using an oscilloscope at the output i have a 4 V signal which has a frequency of about 50 Hz and when i have movement the frequency shifts to 20 Hz.

My question what circuit i need to connect this sensor to a microcontroller (ADC, DAC inputs) in order to know when a detection occurs.

Best regards,
Alex
 

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