This week I spend several days on the firmware of the Bluetooth module. Although there was a bunch of unwarned limitation, I succeed in building a working firmware.
This is a planned structure of the system. The Computer is the master node of the network. Each node keeps listening unless it is told to send its data. The node begins to inquire the surrounding devices when it is told to start. The inquiry lasts about 20 seconds. Then the node is ready to send the MAC address and signal strength (RSSI) back. The baud rate is 38400, odd parity now, but is may be changed depending on the field test.
I just ordered1000ft(300m) CAT3 2pair cable. I measured the length of ITP by step. It’s about 2350inch (60m). I guess the system will perform well. But I’m sure a building schematic will be more helpful both on installation and tracking calculation.
Now I just build the paired wires with the hand drill and solder them on boards. The system functions quite well in short distance.