TEMPERATURE MONITORING

TEMPERATURE MONITORING SYSTEM

Team work made this project a success

CONTENTS

OverviewStatement of needDesign goalsSystem structureDesign componentsArchitectureOverview of codeControl softwareFuture scope

OUTLINE :

MOBILE COMMAND POST•Mobile command system is the heart of the BrahMos missile system .•The MCP controls four missile launchers and has the capability to attach two more launchers incase the situation warrants.• There is a communication server provided to manage different types of communication media .•There is a communication rack consisting of TMS unit as its subsystem.

. Overview :

Temperature monitoring system is designed to collect the temperature data from eight different equipments positioned at different sites and send it to a single redundant host system consisting of main and standby systems, thereby providing an interface between external devices.

Can be used in an area where wide variety of equipments have to be connected to a single monitoring unit.

Different message formats and protocols of equipments can be converted into a unified message format using a single system.

Equipments with different baud rates can also be handled (from a baud rate of 9600 to 57600 bps).

It has a host-end redundancy technique for doubling the equipments from 8 ports to 16 ports.

APPLICATION

BASIC BLOCK DIAGRAM OF TMS

Host systemThis consists of mainly 2 systems, the main

system and the stand by system. This is the interface unit, called the Temperature

Monitoring System, in short TMS unit. It receives the temperature information available in various formats and protocols periodically, from different systems (temperature channels) like Rugged VME chassis, Rugged Flat-Panel Monitor and Routers.Equipments are observed here.

FUNCTIONALITY :

The equipments are the different type of systems which consists of sensor

There can be variety of equipments like RUGGED routers,Barco monitors, work station(VME Enclosure), etc.,

Equipments

An interesting thing is that our TMS unit can handle equipments of different codes of behavior. That is it can take temperature information from these equipments which may be of a variety of formats into a single accordance which is known by the host system that is agreed previously before hand.

TMS

Microcontroller (AT89C52)DUART (SCN2681)EPROM(27C256)RAM(6264)Decoder(LS139)Latch(54LS373)Current Driver(ULN2003)Optical isolator(MCT6X)Reset generator(DS1232)

DESIGN COMPONENTS

MICROCONTROLLER(AT89C52)

AT89C52

FEATURES

• 8-bit Micro-controller• ROM OF 8K(Flash)• Internal RAM of 256 byte •Thirty – two input /out put pins arranged • Four 8 bits ports: P0 – P3•Three 16 – bits timer/counters: T0, T1 and T2•Full duplex serial portOn chip oscillator

Dual Universal Asynchronous Receiver/Transmitter (DUART) is a single-chip MOS-LSI communication device that provides two independent full-duplex asynchronous receiver/transmitter channels in a single package

FeaturesDual full-duplex asynchronous

receiver/transmitter.Quadruple buffered receiver data registers.Programmable data format.– 5 to 8 data bits plus parity.

DUART(SCN2681)

Programmable baud rate for each receiver and transmitter selectable from

16-bit programmable Counter/Timer-External 1X or 16X clock.

– Odd, even, no parity or force parity

Erasable Programmable Read Only Memory (EPROM) is an ultraviolet erasable read only memory .

EPROM

Serial port connectionRS232 is a common interface standard for data communications equipment and is needed to ensure reliable communication and to enable the interconnection of equipment produced by

Decoder

The 74LS139 Decoder is used in TMS designed to be used in memory decoding or data-routing applications, Have very short propagation delay times

LatchThe 8-bit registers feature 3-state outputs designed specifically ,for driving highly capacitive or relatively low-impedance loads .

54LS373 latch is used in this project to latch the higher order address bytes from the multiplexed address/data bus of microcontroller.

Optical Isolators are incorporated for all the nine serial ports in the design of TMS unit. It provides optical connectivity for data transfer but at the same time it provides electrical isolation between the various RS-232 equipments and the host.

Optical Isolator

• Rugged, Reliable, Compact & PresentableHalts and restarts an out-of-control microcontroller.

• Holds microcontroller in check during power transients.

• Automatically restarts microcontroller after power failure

• Monitors Push button for external; override.• Accurate 5% or 10% microcontroller power

supply monitoring

DS1232 Micro monitor chip (Reset Generator):

ARCHITECTURE :

Working PrincipleEquipments whose temperature is to be monitored are connected to the TMS unit. Equipment is linked to the TMS unit at DUART’s section. DUART section consists of 4 DUART’s, as each DUART can handle two equipments thus giving provision to connect 8 equipments. The heart of the TMSC board is the microcontroller 89C52, as it plays the vital role of controlling all the operations inside the board. The data collected at the DUART’s may be of different formats, which is converted by the microcontroller into a particular format understood by the host system.

Level converters are used to convert the standard RS-232 port levels of the serial ports to TTL. An EPROM and two RAM’s are interfaced external to the microcontroller for future use when expansion is required,

The XTAL1 and XTAL2 are used to generate clock pulses by which all internal operations are synchronized .The crystal frequency used here is 11.0592MHZ for micro controller and 3.6864MHz for DUART

TMS indicator glows in red/blue/yellow indicating the internal operation of the TMS unit as indicated below1.Glows in red color while collecting temperature data from equipment.2.Glows in green color while sending the temperature information to the host.3.Glows in yellow color while doing internal operations.

Full-featured source code editor,Device database for configuring the development tool

setting,Project manager for creating and maintaining your

projects,Integrated make facility for assembling, compiling, and

linking your embedded applications,Dialogs for all development tool settings, True integrated source-level Debugger with high-speed

CPU and peripheral simulator, Advanced GDI interface for software debugging in the

target hardware and for connection to monitor-51.

CONTROL SOFTWARE :

Call ‘Initializing’ function.Repeat the following steps continuously for

ever.Check for system receive flag. If it is true, call system response function.If command is ready go for ‘Restart’ function.Read ‘Router’ function.Call ‘System’ function

OVERVIEW OF CODE IN TMS

Future ScopeThe future upgrade is to tie this system into the

master fiber-optic wide area network when the network goes into service and to provide a link to the Programmable Master Supervisory Control (PMSC) system when delivered. Measurements can be made remotely up to several kilometers via FO cable.

The PC monitor will be able to preserve the received immediate message. Then, it extracts and analyzes the historical data to provide a scientific basis for control strategy.