Thank a lot guys... The issue is resolved. I am new to the microcontroller stuffs and this is my first project. I connected two resistors as shown in the diagram referred from internet.
I hope this is the pull up resistor. I am still confused of what and how a pull up resistors work, maybe i should do some homework related to it. Anyways thanks a lot for the support everyone.
Hi,
Looking at your potential divider, a pull-up of 4K7 would probably work.
Good that it is functioning, just make sure you dress your wiring neatly, keep the sensor wiring away from the motor wiring as 6 metre is a nice long EMI antenna.
It doesn't look like the sensor cable is shielded.
Tom.. 
Fine... Thank you so much.
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