Ultrasonic Sensor Slow Reacting -hijack

Hi there,
I am doing my college project with ultrasonic sensors and arduino uno , an automatic light on off system with bidirectional visitor counter which counts the people in the room and as per that the bulb will be on or off and it should also be controlled as per the natural light .
I am facing problem with coding . Please help me in the same. Give me idea, how to do this..

@Shikha_Adatiya: start your own thread, but before you do that, read and carefully follow the directions in the "How to use this forum" post.

Read this, then following the suggestions there start your own thread detailing your own project and problem with it.