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.

Block Diagram:

Transmitter Section:

CAN Controller

PIC16F877A

PIC16F877A

CAN Controller

Humidity

Sensor

Temperature

Sensor

Power Supply

CAN

Bus CANH

CANL

PIC16F877A

CAN Controller

PIC16F877A

CAN Transceiver

CAN Transceiver

CAN Transceiver

Gas Sensor LDR

Sensor

Relay Relay

DC Motor Exhaust Fan

Bluetooth

LCD

Receiving Section:

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.

PC

Power

Supply

Bluetooth