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

2. 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).

3. BLOCK DIAGRAM

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

6. 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.

7. EMBEDDED SYSTEMS

8. 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 MHZ
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

9. PIN DIAGRAM OF AT89S52

10. 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

11. 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 

12. 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

13. 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.

14. 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.

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

16. SCHEMATIC DIAGRAM

17. 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

18. KEIL COMPILER WINDOW

19. APPLICATIONS

20. ADVANTAGES & DISADVANTAGES

21. CONCLUSION

22. BIBILOGRAPHY
The Microcontroller and Embedded systems” by Muhammad Ali Mazidi and Janice Gillispie Mazidi , Pearson Education.
ATMEL 89S52 Data Sheets.

23. THANK ‘Q’