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See the below sensor will it suits you? Actually it detects the motion not the body heat.
Hi,
I need to build a proximity IR sensor (reflective) that detect human.
what IR sensor shall I use use to have maximum sensitivity?
IR Photodiode, or IR Phototransistor, which is best to use for my application?
what part number you suggest?
Thank you,
Victor
hi,The sensor is to put on top of a entrance, purpose is to count how many people is passing though, to detect a few person pass though parallel, a few sensor will put in a line on top to cover. Hence I can' t use PIR sensor, as the detection angle is too wide (overlap), I need a more narrow detection angle for accurate counting.
I can't use camera solution for counting as the cost is too high to implement.
Thank you,
Vistor
Yes, this may be what I going to do, but I am not familiar with IR sensor/detector, what part I shall use for maximum sensitivity? I have read from other forum, to improve the detection range , a lens is needed, this is hard for me to get the suitable lens as well. So if I use a narrow angle IR Emitter and narrow angle IR Detector, do you think I can eliminate the use of lens?hi,
What you are going to need if you use IR, is a X,Y matrix of emitters and detectors connected to a MCU, with some very fancy software...
Yes, this may be what I going to do, but I am not familiar with IR sensor/detector, what part I shall use for maximum sensitivity? I have read from other forum, to improve the detection range , a lens is needed, this is hard for me to get the suitable lens as well. So if I use a narrow angle IR Emitter and narrow angle IR Detector, do you think I can eliminate the use of lens?
Thank you,
Victor
hi Victor,Hi ,
Let me explain more in details, the idea is use on Home Automation, to switch on light or air-cond or anything.
If design use normal simple side beam sensor, or PIR sensor, the system can detect someone is enter, hence turn on lighting. But, when to turn it off? the system must detect the person is leaving . For example , If two person is enter living room, after a while, one is going out, the other one is still stay inside, the system won;t know there is still people inside, so by counting how many is in, how many is out, will be better solution.
May be someone will suggest putting PIR sensor at the living room to detect present of human, but PIR will not work if the humun is not moving. By other sensor like radar and etc, may not practical to install and cover whole living room.
So I come out idea on counting number of person in and out for the control, it just an idea only.
So, It shall use indoors, can be any size , depend on number of sensors. The environment can be light or dark, IR proximity shall be the cheapest solution as I think. (not consider camera)
Thank you,
Victor
If you have an IR based exit/entry counter, you're in pretty good shape. You can use a PIR in the room as a backup in case there is a mistake in the count. (If the count somehow reaches zero, yet there is still movement, then the room is still occupied.)
Hy To All
I Am Trying To Make Automatic Switch Which Turn On The Light When Any One Enter In The Room And Turn Off The Light When He Or She Releave The Room I Tried The I.r Sencer With Toogle Ic But When Two Person Enter In The Room Once Light Is On And Then Goes Off So I Decide To Fix Bidirectional Counter So Can Anyone Suggest Where I Can Find The Circuit Of Bidirectional Counter.