Controller Area Network for Monitoring and Controlling the Industrial Parameters Using Bluetooth Communication

International Journal of Science and Research (IJSR), India Online ISSN: 2319-7064
Volume 2 Issue 8, August 2013
www.ijsr.net
Controller Area Network for Monitoring and
Controlling the Industrial Parameters Using
Bluetooth Communication
B. Praveen Kumar1
, B. Bhavani2
1
Osmania University, M.VS.R Engineering College, Nadergul Road, Hyderabad, India
2
Osmania University, M.VS.R Engineering College, Nadergul Road, Hyderabad, India
Abstract: Various parameters in the industries can be monitored and controlled using CAN bus network integrated with Bluetooth
Communication. Monitoring and controlling the industrial parameters involve a large amount of man power and time consumption. To
overcome the need of huge man power and time consumption this technology was developed which makes use of single person for
monitoring and controlling the entire network. This method has been implemented in order to reduce the usage of wires used for
communication purpose and also to reduce the errors relating to the data transfer. In this project sensors are used to sense the variable
industrial parameters and the CAN protocols are used for error free data transmission and data reception purpose along with Bluetooth,
pic microcontrollers are used for programming the CAN controller. The data transmission rate will be higher than other wireless
systems. This application is user friendly and it can be achieved at a very low cost.
Keywords: CAN (Controller Area Network), PIC16F877A, Bluetooth.
1.Introduction
Consider an industry of large area where the monitoring and
controlling of each section involves a big task. In previous
days for every individual task a person is employed, as in an
industry we have many tasks so to monitor and control them
the industry has to invest huge amount for man power and
apart from the above case human errors can lead to a huge
lose to the industry. It involves a large amount of man power
and time consumption. To overcome these above factors we
developed this technology which makes use of single person
for monitoring and controlling the entire network. This can
be achieved with the combination of both wired and wireless
technologies CAN bus network with the Bluetooth
technology.
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. This paper gives a kind of design
of CAN bus for monitoring and controlling the various
parameters, which includes CAN bus intelligent nodes,
sensors network, Bluetooth and the whole network
architecture. This technology is a cost effective one and it
can be used in various applications like industries, medical
field, automobiles, and home.
2.Experimental Setup
In our experimental setup, various sensors are connected to
the PIC16F877A which acts as a slave node. These sensors
sense the various industrial parameters like temperature, fire,
light and gas.
2.1 Transmitting Section
In the transmitting section, there are various sensors
connected to the PIC microcontroller which acts as a slave
node as shown in the below figure1. These sensors sense the
various parameters like temperature, fire, light, gas. Those
variable parameters which are sensed by the slave nodes are
sent to the master controller through can bus and can
controller using the can protocol. The master controller pic is
programmed in such a way that the parameters are sensed
periodically and transmitted.
The CAN protocol are effectively used for achieving higher
data rate. The loads can also be operated by the master
controller. If the value of any sensor is above the cutoff point
then the master controller controls that sensor to come below
the cutoff point. The master controller receives the data from
the slaves and processes that data to the PC through
Bluetooth.
In the receiving section constituting of a Bluetooth module
as shown in the figure2 which is used for collecting the data
which is sent by the master controller. The various nodes on
the transmitting section can be monitored on the receiver
side by

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Figure 1: Block Diagram of Transmitter Section
2.2 Receiving Section
Figure 2: Block Diagram of Receiving Section
If anything is going abnormal, the user can control the
devices at the other end. These values get updated in the
personal computer for later verification.
3.Protocol and Hardware
3.1 CAN-controller area network
CAN is one of the field bus control system type used in
networking. It is a message based protocol device. The
communication can be achieved between various devices
using CAN protocol. The CAN bus can be used to connect
the control unit, transmitting and receiving unit. In this paper
CAN bus is used in automation environment, which is
primarily due to low cost. The multi-master node CAN is
able to send and receive messages but not simultaneously.
The message consists primarily of an id which represents the
priority of the message. The data’s are transmitted serially on
to the bus. This signal pattern is encoded in NRZ form and
sensed by the nodes. Whenever the bus is free the most
dominating message will be executed first and the lower
priority will sense these and will back-off. Bit rate is up to
1MB/S are possible at network length below 40m and
decreases with increase in network distance. Since the CAN
shifts the voltage level the differential signal CANH and
CANL are used. Carrier senses multiple access protocol with
collision detection and arbitration on message priority are
two types of protocols used in CAN. Error control
mechanism such as CRC is used to ensure sensor data
integrity. Both the remote frames and the overload frames
are used for flow control mechanism.
Figure 3: CAN bus length versus bit rate
The communication speed and bus length need to be set
according to the system by the user. The CAN bus normally
consists of two wires (CAN_High and CAN_Low), and the
CAN controller is connected to those two wires via a
transceiver. The bus level is determined by a potential
difference between the CAN_High and CAN_Low wires.
There are two bus levels, dominant and recessive, and the
bus assumes either level at any given point of time. For
logically wire-AND’d buses, the dominant and the recessive
levels are recognized as a logic 0 and logic 1, respectively. A
transmit unit can send a message to receive units by
changing these bus levels. CAN nodes have the ability to
determine fault conditions and transition to different modes
based on the severity of problems.
3.2 PIC- Programmable Intelligent Computer
PIC is Harvard architecture. Data bus and address bus are
separate in Harvard architecture. Thus a greater flow of data
is possible through the central processing unit, and of course,
a greater speed of work. Separating a program from data
memory makes it further possible for instructions not to have
to be 8-bit words. It is also typical for Harvard architecture
to have fewer instructions than von-Neumann’s, and to have
instructions usually executed in one cycle. Microcontrollers
with Harvard architecture are also called “RISC
microcontrollers”.
PIC16F873A/876A devices are available only in 28-pin
packages, while PIC16F874A/877A devices are available in
40-pin and 44-pin packages. The PIC16F873A/74A have
one-half of the total on-chip memory of the
Personal
Computer
Power
Supply
Bluetooth
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PIC16F876A/77A. The 28-pin devices have three I/O ports,
while the 40/44-pin devices have five. The 28-pin devices
have fourteen interrupts, while the 40/44-pin devices have
fifteen. The 28-pin devices have five A/D input channels,
while the 40/44-pin devices have eight. The Parallel Slave
Port is implemented only on the 40/44-pin devices.
The PIC16F87XA devices have a 13-bit program counter
capable of addressing an 8K word x 14 bit program memory
space. The PIC16F876A/877A devices have 8K words x 14
bits of Flash program memory, while PIC16F873A/874A
devices have 4K words x 14 bits. Accessing a location above
the physically implemented address will cause wraparound.
The Reset vector is at 0000h and the interrupt vector is at
0004h.
4.Results
Below is the figure4 showing the values of different nodes
on the lcd at the master node.node-2 gives the information of
ldr and fire sensors node-3 gives the information regarding
temperature and gas sensors.
Figure 4: sensor values on lcd
The control information which is present at the CAN master
controller is sent to the personal computer using the
Bluetooth. Below is the figure5 showing the outcome of
Bluetooth on the hyperterminal. This can be stored in the
personal computer and can be used later for verification.
Figure 5: Displaying control information on hyperterminal.
5.Conclusion
In this method the integration of wired and wireless
technology is achieved by using CAN and Bluetooth. In
previous days manual monitoring and controlling was used.
The wireless technology applied also has higher data rates.
In this paper the above disadvantage has been overcome
using Controller Area Network which makes us useful in the
designing of number of CAN nodes. This paper gives the
method of accurate and reliable transmission of data without
data loss. The data from the slave nodes are transmitted to
master PIC microcontroller. The transmitting section will
send the data and receiver can check the data in the personal
computer. The efficiency of this system is much higher than
any other systems in use. This tends to be an accurate one
since the intelligent device uses both encoding and decoding
method for communication.
References
[1] Xiaohong Ren, Tianwen Wang, Chenghau Fu, Shuxiang
Jia “CAN Bus Network Design Based on Bluetooth
Technology” in Proceedings of ICECE- International
Conference on Electrical and Control Engineering, pp
560-564, 2010.
[2] Kumar.M, A. Verma, A. Srividya, “Response Time
Modeling of Controller Area Network Distributed
Computing and Networking”, pp 163-174, 2009.
[3] Rick Stoneking, Anadigics, “A Simple Controller Area
Network Node using The MCP2515 and PIC16F877A”,
Microchip Inc, pp 658-662. 2007.
[4] Zdenek Braqdac, Pertr Cach, Radimir Vrba, “Wireless
Communication in Automation Electronics Circuits and
System”, pp 659-662, 2003.
[5] Tindell, K.A Burns, A.J Wellings “Calculating
Controller area Network Message Response Times”, pp
1163-1169, 1995.
Author Profile
B. Praveen Kumar pursuing the M.E degree in
Embedded Systems and Vlsi Design from M.V.S.R
Engineering College. He received the B. Tech degree
in Electronics and Communication Engineering from
Padmasri Dr. B. V. Raju Institute of Technology in 2011.
B. Bhavani received B.E (ECE), M. Tech (Embedded
Systems) from Andhra University, JNTU-H, Andhra
Pradesh, India in 2003 and 2008 respectively.
Presently working as Assistant Professor in the Dept
of ECE, MVSR Engineering College, Osmania University, Andhra
Pradesh, India
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Controller Area Network for Monitoring and Controlling the Industrial Parameters Using Bluetooth Communication

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