PRECISE TEMPERATURE CONTROL FOR INCUBATORS USED IN HOSPITALS FOR THE PRE BORN CHILD GROWTH

ABSTRACT The controller continuously polls the temperature with certain regular time intervals and displays over the 7_segment display The temperature readings observed by the microcontroller through temperature sensor are compared with the switches programmed temperature value to control the heater (ON/OFF).

BLOCK DIAGRAM

HARD WARE EQUIPMENTS POWER SUPPLY BLOCK MICROCONTROLLER (AT89S52/AT89C51) DS1621 7 SEGMENT DISPLAY BC547 RESISTORS & CAPACITORS 1N4007 RELAY

EMBEDDED SYSTEMS Definition for :- EMBEDDED SYSTEMS A combination of hardware and software which together form a component of a larger machine. An example of an embedded system is a microprocessor that controls an automobile engine. An embedded system is designed to run on its own without human intervention, and may be required to respond to events in real time.

EMBEDDED SYSTEMS

AT89S52 MICRO CONTROLLER Compatible with MCS®-51 Products 8K Bytes of In-System Programmable (ISP) Flash Memory 4.0V to 5.5V Operating Range Crystal Frequency 11.0592MHZ Three-level Program Memory Lock 256 x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Eight Interrupt Sources Full Duplex UART Serial Channel Watchdog Timer AT89S52

PIN DIAGRAM OF AT89S52

BC547 The BC547 transistor is an NPN Epitaxial Silicon Transistor. The BC547 transistor is a general-purpose transistor in small plastic packages. It is used in general-purpose switching and amplification BC847/BC547 series 45 V, 100 mA NPN general-purpose transistors. Whenever base is high, then current starts flowing through base and emitter and after that only current will pass from collector to emitter  

DS1621 (TEMPARATURE SENSOR) Features: Measurements require no external components. Measures temperatures from -55°C to +125°C in 0.5°C increments. Fahrenheit equivalent is -67°F to 257°F in 0.9°F increments. Temperature is read as a 9-bit value (2-bytetransfer) Wide power supply range (2.7V to 5.5V) Converts temperature to digital word in less Than 1 second Thermostatic settings are user definable and Non volatile. Data is read from/written via a 2-wire serial interface (open drain I/O lines). Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermal sensitive system 

PIN DESCRIPTION OF DS1621 SDA - 2-Wire Serial Data Input/ Output   SDA - 2-Wire Serial Data Input/ Output SCL - 2-Wire Serial Clock GND - Ground TOUT - Thermostat Output Signal A0 - Chip Address Input A1 - Chip Address Input A2 - Chip Address Input VDD - Power Supply Voltage

SEVEN SEGMENT DISPLAY The segments themselves are identified with lower-case letters "a" through "g," with segment "a" at the top and then counting clockwise.

The LED’S in a seven-segment display are not isolated from each other The LED’S in a seven-segment display are not isolated from each other. Rather, either all of the cathodes, or all of the anodes, are connected together into a common lead, while the other end of each LED is individually available. This means fewer electrical connections to the package, and also allows us to easily enable or disable a particular digit by controlling the common lead. There is no automatic advantage of the common-cathode seven-segment unit over the common-anode version, or vice-versa. Each type lends itself to certain applications, configurations, and logic families.

RELAY IT IS A ELECTRO MAGNETIC SWITCH USED TO CONTROL THE ELECTRICAL DEVICES COPPER CORE MAGNETIC FLUX PLAYS MAIN ROLE HERE

SCHEMATIC DIAGRAM

SOFTWARE REQUIREMENTS PROGRAMMING LANGUAGES Embedded C , ALP (Assembly Language) COMPILERS: Keil 2.0/3.0uv DUMPING SOFT WARE: Using Micro controller flash Software we are dumping our HEX Code into Micro Controller

KEIL COMPILER WINDOW

APPLICATIONS

ADVANTAGES & DISADVANTAGES

CONCLUSION

BIBILOGRAPHY The 8051 Microcontroller and Embedded systems” by Muhammad Ali Mazidi and Janice Gillispie Mazidi , Pearson Education. ATMEL 89S52 Data Sheets. www.atmel.com www.beyondlogic.org www.wikipedia.org www.howstuffworks.com www.alldatasheets.com

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