Bluetooth presence detection
Simple occupancy detection via Bluetooth
This flow checks whether a Bluetooth device is in range. It does not require BT pairing because name lookups are allowed on any device. Tested on a Raspberry Pi 3 with the integrated BT receiver and some cellphones.
Usage
- For Raspian, install
hcitoolwithsudo apt-get install bluez - Verify that BT works, e.g. with
hciconfig - The user running Node-RED must be a member of the
bluetoothgroup, e.g.sudo usermod -a -G bluetooth nodered - Replace the MAC in the cellphone node with the target device's MAC. If unsure where to find it, make the device discoverable and do
hcitool scan
[{"id":"a2aa8fbd.4cf9c8","type":"tab","label":"Flow 1","disabled":false,"info":""},{"id":"f01d11e6.a3026","type":"exec","z":"a2aa8fbd.4cf9c8","command":"/usr/bin/hcitool","addpay":true,"append":"","useSpawn":"false","timer":"10","oldrc":false,"name":"bt presence","x":350,"y":160,"wires":[["124fdc39.b4a09c"],[],[]]},{"id":"124fdc39.b4a09c","type":"function","z":"a2aa8fbd.4cf9c8","name":"nonempty","func":"msg.payload = msg.payload ? 1 : 0;\nreturn msg;\n","outputs":1,"noerr":0,"x":520,"y":160,"wires":[["df8114bf.397578"]]},{"id":"df735f89.216f8","type":"inject","z":"a2aa8fbd.4cf9c8","name":"cellphone","topic":"","payload":"name 84:B1:53:E3:8A:18","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":180,"y":160,"wires":[["f01d11e6.a3026"]]},{"id":"df8114bf.397578","type":"debug","z":"a2aa8fbd.4cf9c8","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":680,"y":160,"wires":[]}]
