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I did not use doppler sensor with arduino, but i have used Ultrasonic sensor & in ultrasonic sensor we have to define Trig & Echo pins first ,i.e Ultrasonic ultra1(26,27)
& then in void loop we call it using ultra1.Ranging('CM'). Same procedure may be used for doppler sensor after adding its library.
this would be helpful
http://forum.arduino.cc/index.php?topic=61989.0