Is There a Small WiFi-Enabled Human Motion Sensor?

[Aymanimo]

Hello
I'm designing a project and i need a sensor that can detect human motion.I would like to detect the output signal of this sensor by searching it via laptop or mobile phone as if they are searching for a wifi signal.
I would like to know if such sensor is available or should i build a module for this using several components?I want this sensor to have small dimensions so it should be carried by the user anywhere.

Awaiting a reply.
Many Thanks
Ayman

 

[NascentOxygen]

A sensor to detect humans probably works on the presence of infrared radiation. It might not differentiate between a human and a dog or a fire.

A sensor to detect motion probably takes a photo at intervals, and detects whether a large patch of pixels has changed. It might not differentiate between a human or a horse or a falling tree.

As for wifi, I have no idea.