For programming each of the nodes are connected as shown in Fig.
The instrucctions for programming:
---sudo make -f hello.bus.45.make program-usbtiny
---sudo avrdude -p t45 -P usb -c usbtiny -U flash:w:hello.bus.45.c.hex
After flashing all the nodes and the bridge, and display it
Use Interface
The instructions:
Plug your bridge into your computer (with the nodes attaches).
Connect the nodes with a cable as shown in the picture.
Open a Arduino IDE
Open the serial monitor from the "Tools" menu > serial monitor
Make sure the baud rate is set to 9600.
Enter number of a note (pick a number) into serial monitor - press the key or the "send" button on the serial monitor.
The LEDs on all the boards should light up once.
After all the boards light up, the board with the number you entered into the serial monitor should light up again.
The node name (ex: node 1) should also be displayed on the serial monitor.