Hi guys can you help me with my design project. Im using arduino nano with an ultrasonic sensor attached to a servo motor. If the sensor detects an object it activates vibration module and scans for empty area on the field thru left and right rotation of the the ultra sensor using servo motor. If the left area is clear it sends message thru wireless headset saying "MOVE LEFT". this is for the blind people. could anybody with a kind heart help me? 
Im not so sure this is a good idea to make for a blind person.
If the sensor detects an object it activates vibration module and scans for empty area on the field thru left and right rotation of the the ultra sensor using servo motor.
What distances are you looking at?
How long does it take the servo to move from right to left or VS.
What degree is considered RIGHT or LEFT?
Where is this going to be mounted?
If the left area is clear it sends message thru wireless headset saying "MOVE LEFT". this is for the blind people.
NO, if the person is blind, the worst thing you could do is obstruct their hearing, by making them need to wear a headset. If you want you could instead use two vibration motors on either side of the person, and if the path is clear, you send out two short vibrations on that "side". If the path is blocked, one long vibration from the obstructed side.
Something like that. it is better for them to feel the vibrations then to hear GO LEFT, or GO RIGHT through a headset..
I do think the headphones are a BAD idea. as another idea for feedback, how about a headband with some small inflatable bladders. Then these could be inflated relative to the distance being detected in any direction.
See the November 2014 issue of Circuit Cellar for a successful implementation of a very similar project, called an "ultrasonic wayfinder". The authors used an ultrasonic ranging module mounted on a finger ring as a sensor and small vibrating motors mounted on a headband to direct a blind person's movements.