Presence Detector

[SAMARESH GOSWAMY]

[B
hello,
I NEED CIRCUIT TO AUTOMATICALLY FIND OUT WHETHER ANYBODY IS PHYSICALLY PRESENT INSIDE A ROOM OR NOT.

 

[Gayan Soyza]

PIR sensor circuit would be fine.Hope you don't need to sense the body temperature?

 

[ericgibbs]

Hi Gayan,

Problems with PIR's is that they only detect 'body' motion, ideal for checking entry/exit from a room, but if the person is still [motionless] the PIR will not detect him.

Regards

OP, is it required to check entry into room.?

 

[Gayan Soyza]

but if the person is still [motionless] the PIR will not detect him.

Of course if the person is in a good sleep it wont detect.

Ahhhhh I remember that I did a similar thing into my room light.If anyone Presence it will switch on the light.But this a little bit advanced.

The OP needs some kind of people counter.