Human Detection Room light

Thread Starter

micropad

Joined Dec 24, 2011
75
Hi team,

Dear All I need to turn on LED in side room once the person entered to the room and until person staying the room LED should remaining ON state , finally the person who when out the room the LED should turn OFF
Suppose there are two persons in the room So LED should be reaming until all the persons out the room

I used PIR sensor which turn ON the LED but LED turn OFF while person inside the room

Please advice
Thanks in advanced
 

ericgibbs

Joined Jan 29, 2010
10,042
hi micro,
A PIR works on the principle that the IR radiant object ie: a human, must be moving in order to create an AC signal that can amplified,
E
 

ericgibbs

Joined Jan 29, 2010
10,042
hi,
If the person keeps moving within the coverage area of the PIR, then providing the PIR is set to re-trigger on movement, the PIR output will remain On.
Do you have a photo-shot of the PIR type to post.?
E


EDIT:

If it is this type, watch this video link
 
Last edited:

Thread Starter

micropad

Joined Dec 24, 2011
75
hi,
If the person keeps moving within the coverage area of the PIR, then providing the PIR is set to re-trigger on movement, the PIR output will remain On.
Do you have a photo-shot of the PIR type to post.?
E


EDIT:
If it is this type, watch this video link
Dear That is the sensor exactly what i am using / lets suppose one person who came to the bathroom then PIR trigger , the light turn ON, So then the light should keep reaming ON even thought the person moving or not in side the bathroom , once the person who left the bathroom light should turn off

Please help
Thanks in advanced
 
Last edited:

ericgibbs

Joined Jan 29, 2010
10,042
hi micro,
That type of PIR sensor is not suitable for detection of someone entering and leaving a room.
The only way it could be used is if you limit the width of the detection angle of the PIR and place it just outside the door,
As the person entering the room passes thru the PIR detection range, the PIR output triggers a latching circuit which switches On the light.
When the person leaves the room the PIR detects the movement and resets the light latch to OFF.

A dual LED IR emitter and detector light path across the door would be a better solution.
In that way you could detect In and Out direction of movement and also possibly the number of people entering and leaving the room, for the light On/Off operation.

E
 

Thread Starter

micropad

Joined Dec 24, 2011
75
hi micro,
That type of PIR sensor is not suitable for detection of someone entering and leaving a room.
The only way it could be used is if you limit the width of the detection angle of the PIR and place it just outside the door,
As the person entering the room passes thru the PIR detection range, the PIR output triggers a latching circuit which switches On the light.
When the person leaves the room the PIR detects the movement and resets the light latch to OFF.

A dual LED IR emitter and detector light path across the door would be a better solution.
In that way you could detect In and Out direction of movement and also possibly the number of people entering and leaving the room, for the light On/Off operation.

E
Yes .... It is very hard to install dual

anyway thanks for your support
 

ericgibbs

Joined Jan 29, 2010
10,042
hi,
What I did for an outdoor garden security project for pathway, was to use two PIR modules, mounted about 2 feet apart, on the same side of the path.
The PIR outputs are connected to an MCU input, the MCU program can then determine the direction of anyone moving along the path.
Also by being spaced at 2 feet it ignores small animals.
E
 
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