In this project, the BlueSmirf Silver Bluetooth is not as it
advertised and specification or datasheet is not provided.
Configuring the device on air (via Bluetooth communication)
is also not possible. Therefore, the solution is connecting the
Bluetooth Module using wired method to computer. For
connection of the Bluetooth Module to computer, RS-232
shifter circuit is required. The RS-232 shifter is functioned as
a device to translate voltage between PC and Bluetooth
Module [7], [8]. Voltage swing and related voltages of device
is presented in Table 1.