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Detecting occupancy of a room to switch light
My plan is to switch the light in a room on and off based on whether someone is in a room or not and based on the light level. The last should be very easy, but the first worries me a bit. I have several ideas:
1) Using a motion sensor in a room:
I already tried the standard motion detector which work with a pyroelectric sensor. These detectors have the disadvantage that they are not very sensitive and you do need to move a lot to be detected. Therfore they are useless if you sit on couch or at a table. However there are also ones which work with ultrasonic or microwave sensors. Has anyone experience with those? Do you know any compatible with homey
2) Counting the number of people with two motion sensors at the door
As suggested by Fibaro, one could use two motion sensors - one at the outer side of the rooms door, one a the inner - and based on in which order they are activated increase or decreased to the number people in a room. I saw that there are cheap battery operated 433MHz motion sensors (e.g. http://www.amazon.com/Wireless-Motion-Sensor-Security-System/dp/B00BQN87XM ). Is it possible to use those in connection with Homey to do the job? Do you know whether each of these sensors send the same signal or whether they have some kind of ID configurable e.g. by jumpers?
3) Using the signal of you mobile phone:
I recall reading somewhere reading a post from Emile in this forum that homey would be able to track your position in your flat/house based on the wifi/bt signal strength of your mobile phone, but I can't find this anymore. @Emile Is there anything new on this?
This idea would have the drawback that you always would have to have your mobile phone in your pocket and it would not work with visitors.
What do you think? Do you have any other suggestions?