Ok, here is what I want to do. No I actually did, but I want to know if someone has a different idea on how to approach this.
I want to know if a person ( or more than one) is present in a room and when there is one I'd turn on the light.
I did this a few years ago with a light beam made out of one IR transmitter (the modulated one for IR controls) two IR receivers, a few logic ICs and a triac etc. Not very difficult, I could determine the direction of the person passing through the beam and count the number of people.
However, this whole thing needs a power supply at a place where I do not always have a power outlet nearby and it has more wiring than I want to.
Does anybody have experience with a system that senses the presence of a person?
I do not want to use IR Motion sensors, because the person is not necessarily moving. The person can also be hidden behind some furniture.
The system should also still work when I moved around a chair for example. So simple capacitive proximity sensors/loops might not work.
Only a human beings presence should be detected.
I am not asking for schematics here, just ideas.
Thanks for any feedback
I want to know if a person ( or more than one) is present in a room and when there is one I'd turn on the light.
I did this a few years ago with a light beam made out of one IR transmitter (the modulated one for IR controls) two IR receivers, a few logic ICs and a triac etc. Not very difficult, I could determine the direction of the person passing through the beam and count the number of people.
However, this whole thing needs a power supply at a place where I do not always have a power outlet nearby and it has more wiring than I want to.
Does anybody have experience with a system that senses the presence of a person?
I do not want to use IR Motion sensors, because the person is not necessarily moving. The person can also be hidden behind some furniture.
The system should also still work when I moved around a chair for example. So simple capacitive proximity sensors/loops might not work.
Only a human beings presence should be detected.
I am not asking for schematics here, just ideas.
Thanks for any feedback