Page 67 - The Definitive Guide to Building Java Robots

Preston_5564C02.fm Page 48 Wednesday, September 14, 2005 5:42 AM

48 CHAPTER 2 ■ SERIAL COMMUNICATION

Figure 2-10. DLink DBT-120 USB Wireless Bluetooth Adapter

Code Objectives
The objectives for this code are to:
• Demonstrate a wireless serial connection

• Show that a serial connection is the same as a wired one with the proper software
installed on the Stamp

Code Discussion
The Bluetooth board connected to our BOE (Board of Education) will communicate directly to
our PC via one of its serial connections. While our PC will not notice any difference, there are
some slight changes that have to be made on the Stamp side.
First, some initialization commands need to be sent to the EB500, along with the address
of our USB Bluetooth adapter on the PC. Once it’s connected, our program looks very much
like the original with the exception of the SEROUT pin and the SERIN pin: pin 1 versus pin 16.
The Java code is the same code as that used earlier in Example 2-4. Just change the port ID
to match the Bluetooth adapter and you are set. (See Example 2-14.)

Example 2-14. BluetoothStamp.bs2
' {$STAMP BS2}
serialin VAR Byte
INPUT 5
PAUSE 1000
SEROUT 1,84, ["con 00:11:95:4F:54:39",CR]
SERIN 0,84,[WAIT("ACK",CR)]
WaitForConnection:
IF IN5 = 0 THEN WaitForConnection