There are two ways to approach this problem. Either with BT decibel measuring, provided everyoen har something with BT.
The system thinks you are not in the room before the signal strength of the BT device reaches a certain level.
And also as pbcstudios suggested with thermal detection
Can this be used?:
http://www.dx.com/p/mlx90615-ir-human-body-infrared-non-contact-thermometer-module-405701#.VflnUN_tlBc
Ok, so the sensor is requesting a number to continue the count? And there is no way to bay-pass this and insert my own?
I seem to have the same problem. Did you find any answer to this?
I get this reply from the serialmonitor:
send: 9-9-0-0 s=1,c-9-0-0 s=1,c=2,t=24,pt=0,l=0,st=ok:
sensor started, id 9
send: 9-9-0-0 s=255,c=0,t=17,pt=0,l=5,st=ok:1.4.1
send: 9-9-0-0 s=255,c=3,t=6,pt=1,l=1,st=ok:0
read: 0-0-9 s=255,c=3,t=6,pt=0,l=1:M
send: 9-9-0-0 s=255,c=3,t=11,pt=0,l=12,st=ok:Energy Meter
send: 9-9-0-0 s=255,c=3,t=12,pt=0,l=3,st=ok:1.0
send: 9-9-0-0 s=1,c=0,t=13,pt=0,l=0,st=ok:
send: 9-9-0-0 s=1,c=2,t=24,pt=0,l=0,st=ok:
send: 9-9-0-0 s=1,c=2,t=24,pt=0,l=0,st=ok:
send: 9-9-0-0 s=1,c=2,t=24,pt=0,l=0,st=ok:
Old thread, but is it possible to clean up enough to make a tutorial on this? All the info is quite confusing to a person who's not as good as you guys 
Is it also possible to adapt this method into making a door lock?
I really like this idea, but for it to be effective we need to measure the decibel level of the connection and not just connected/disconnected state. Is this possible?
Hi!
Im working a RFID doorlock, but Im stuck in the code. I have a RFID-RC522 device and not the none recommended on the site.
I have two problems. First is correctly changing the default pins on the NRF24L01+ as the RFID device holds the same pins.
Second is to correctly implement the communication in the code im using.
Code is uploaded as attachment.