Yes , You can use proximity sensor or you can use occupancy sensor... may be this information available on www.enocean.com
There are many possible solutions, but not enough info to suggest a solution that is likely to be acceptable.
How large is the area you need to sense?
Is it indoors?
What materials is the area comprised of?
How far away is the human from the sensor?
What sensing angles are needed?
What is the area geometry or floor plan?
Is there line-of-sight from sensor to human?
What else is nearby - what are the obstacles?
How many people might be in the area?
Could other animals be in the area?
Is there furniture in the area?
Does the furniture move?
What is the budget?
What type of output signal is needed?
What type of power is available?
How many hours per day does the sensor need to work?
How big is the person?
What are the ambient lighting conditions?
Does the ambient lighting change over time?
By the way, do anybody have a similar solution (as the link) but much cheaper?
Thanks in advanced.
Is there any sensor to detect human presence . Am aware of PIR (Passive Infra Red) sensor , which would human motion but not the human presence . Another way is by using image processing technique. Kindly suggest me a better solution .