Bluetooth® Tally System
Fig 2.
This is what the sender unit looks like inside. The green card
is the
actual bluetooth card and the rest is just a few transistors and a relay.
The bluetooth card and the diodes is powered with the 12V that
comes from the sony cameras.
The green diode is on when the two bluetooth devices are connected
to eachother.
My system pairs the sender with the receiver via the MAC address. MAC address
is a fixed address
of each bluetooth card. We have programmed them to connect after just 2 seconds
after received power on.