problem with tracker sensor

i put this

and code

code: [select]

void setup()
{
  serial.begin(9600);
}
void loop()
{
  serial.println(digitalread(52));
  delay(500);
}

after see zeros no more it
i put hand on sensor can see red led lighting nothing change zeros
can u me pls   have fix problem

(arduino due)

there's no pin 52 far know.

code: [select]

  serial.println(digitalread(52));

your pic shows it's on pin 2......

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