B. Bluetooth Module
Bluetooth is a wireless instrument for exchanging data over
short distances (using short wavelength radio transmissions)
from fixed and mobile devices. Silver works as a serial
(TX/RX) pipe. Any serial stream from 9600 to 115200bps can
be passed seamlessly to the target. The Bluetooth Module
signal pins of TX and RX are 3V to 6V tolerant, so there will
be no level shifter or level translator for connection to
microcontroller. This device has two modes; command mode
and data mode. While in command mode, all incoming data
were commands (AT-Command). Hence in data mode, this
Bluetooth will transfer all data from source to target. Mostly,
all data mentioned here were texts or ASCII codes where it
was commonly used in this project.