ieee 2012 projects for m tech btech ece eee embedded systems@ srcembedded solutions- hyderabad. web:www.srcembedded.com, ph-8297 313 858 mail:srcembedded@gmail.com

1. CAN BUS NETWORK DESIGN BASED ON BLUETOOTH
TECHNOLOGY
Introduction:
In recent years, the application research of Bluetooth has been paid greatly attention in
industry field, since it is a good solution for short range wireless communication and
replacement of short range cable. Bluetooth modules operate in the unlicensed ISM (Industrial,
Scientific, and Medical) frequency band at 2.4MHz and avoid inferences from industry
environment. Bluetooth radio adopts a fast acknowledgement and frequency hopping scheme to
make the link robust, especially that it consists of sensor network has obviously anti-inferences
in strong EMS environment.
On the other hand, CAN (Controller Area Network) bus is one of the field bus most
widely used in the world. CAN bus have been widely used in sensors, data acquisition, industrial
control systems, and instrument device with high reliability, reality, and flexibility. How to
integrate the CAN bus wired technology with the Bluetooth wireless technology is a hot research
task now. The paper gives a kind of design of CAN bus network based on Bluetooth technology,
including CAN bus Bluetooth intelligent nods, sensors network with Bluetooth and the whole
network architecture.
Existing System:
In the earlier, CAN bus is used for effective wired communication. And Bluetooth is used
for effective short range communication. But there is no such a system has been implemented to
combine both wired as well as wireless technology to create a highly reliable system. So an
effective system is proposed.
Proposed System:
In the proposed system, multi CAN controllers and Bluetooth nodes are implemented.
The sensors are connected to the PIC microcontroller. The sensor values are sending to the
master node for processing through CAN controller. The master receives the value and process
the data; depending on the data it sends the value to the PC through Bluetooth. These values are
updated in the PC for later verification. If anything is going abnormal, the user can control the
devices in the other end by sending the data from the PC itself. The data path are from PC to
Bluetooth, Bluetooth to Bluetooth, Bluetooth to CAN through PIC, and CAN to PIC, then the
devices are controlled. The sensor values are also displayed in the LCD too. By this way we can
achieve combined wires/wireless data communication.

2. Block Diagram:
Transmitter Section:
Temperature
Sensor
LDR
Sensor
Gas Sensor
PIC16F877A
CAN Controller
CAN Transceiver
Humidity
Sensor
PIC16F877A
Relay
Relay
DC Motor
Exhaust Fan
CAN
Bus
CAN Controller
CAN Transceiver
CANH
CANL
Power Supply
CAN Transceiver
CAN Controller
PIC16F877A
PIC16F877A
LCD
Bluetooth

3. Receiving Section:
Power
Supply
Bluetooth
PC
Hardware Requirements:
 PIC 16F877A Microcontroller unit
 Bluetooth Module
 CAN Controller, Transceiver
 Temperature, Gas, Humidity, LDR sensor.
 LCD
Software Requirements:
 Embedded C
 MP Lab or CCS Compiler
Advantages:
 Highly Reliable
 Effectively method that provide combined wires/wireless data communication.