Originally Posted by
Rjk
only just caught up with this, I'll try to ahvw a watch later.
I will say though that some of my current projects involve adding Bluetooth connectivity to some existing devices so I know a small amount about it, and there are many problems with this idea.
size - Bluetooth chips aren't this small, nowhere near.
power - Bluetooth requires a power source to transmit its signal- passive RFID can use the power from the RF reader to transmit its signal, but Bluetooth does not work in that way.
any of these trials are probably just picking up stray signals from any number of other devices. Bluetooth signals usually are only viable over low 10s of metres, but sometimes, especially outdoors they can carry for a much longer distance. I've had a prototype working over around 200m outdoors, and 70m in a building