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VENUGOPAL.P SATHISH .A

JANARDHAN.P

VENKATRAMAN.MPROJECT CO-ORDINATOR INTERNAL GUIDE

MR. K.SENTHAMILSELVAN, ME, p.hd., MR.S.SIDDIK.BE

REALIZATION OF I2C PROTOCOL USING

RTC TECHNIQUE

BATCH 24

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ABSTRACT

Our project is REALIZATION OF I2C PROTOCOL USING REAL TIME

CLOCK TECHNIQUE in this project realizing the I2C protocol and

implementation of I2C Protocol with Atmel 89c51 and REAL TIME

CLOCK IC (DS1307).Using I2C protocol external peripherals can

connect with microcontroller but in our project RTC IC interface

with microcontroller and controlling a devices by setting year

,month ,day ,hours ,minutes ,and seconds in the RTC IC.We hope

this development will lead a new role in industry in future.

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AIM OF THE PROJECT:

THE AIM OF THE PROJECT IS TO CONTROL THE

HIGH CURRENT DEVICE BY USING I2C PROTOCOL

USING RTC TECHNIQUE.

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REAL TIME CLOCK CHIP

The DS1307 serial real-time clock (RTC)CHIP is alowpower,full binary-coded decimal (BCD)clock/calendarplus 56 bytes of NV SRAM.

Address and data are transferred serially throughan I2C, bidirectional bus.

The clock/calendar provides seconds, minutes,hours,day, date, month, and year information.

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The end of the month date is automatically adjusted

for months with fewer than 31 days, includingcorrections for leap hour format with AM/PMindicator.

The DS1307 has abuilt-in power-sense circuit thatdetects power failures and automatically switches tothe backup supply.

Timekeeping operation continues while the partoperates from the backup supply.

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FEATURES OF RTC :

Real-Time Clock (RTC) Counts Seconds, Minutes,Hours, Date of the Month, Month, Day of theweek, and Year with Leap-Year CompensationValid Up to 2100 .

56-Byte, Battery-Backed, General-Purpose RAMwith Unlimited Writes.

I2C Serial Interface

Programmable Square-Wave Output Signal

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Automatic Power-Fail Detect and Switch Circuitry

Consumes Less than 500nA in Battery-Backup

Mode with Oscillator Running

Optional Industrial Temperature Range: -40C to

+85C

Available in 8-Pin Plastic DIP or SO

Underwriters Laboratories (UL) Recognized

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What is I2C

The name stands for Inter - Integrated Circuit Bus A Small Area Network connecting ICs and other electronic systems

Originally intended for operation on onesingle board / PCB Synchronous Serial Signal

Two wires carry information betweena number of devices

One wire use for the data

One wire used for the clock

Today, a variety of devices are available with I2C Interfaces Microcontroller, EEPROM, Real-Timer, interface chips, LCD driver, A/D

converter

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I2C Bus Configuration Example

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BLOCK DIAGRAM

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BLOCK DIAGRAM EXPLANATION

Initializing the time anddate in the RTC chip through I2C protocol . Real Time

and date information is read by microcontroller and

then and display in LCD ,LCD used to display time and

date of RTC and controlling device timing also.

Through setting the device timing either by switch or

pre initialization the program itself we can control the

any devices. power supply required for both RTC chip

and microcontroller .RTC clock having separate

battery for to run continuous clock without interrupt.by setting the time in rtc , we can control many

device by timing .But in our project we are

controlling DC motor.

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CIRCUIT DIAGRAM

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CIRCUIT DIAGRAM EXPLANATIONS

The 8 bit microcontroller 89c51is used in this circuit to interface lcd and RTC

and switches .RTC Real time clock ic DS 1307 is used for clock timing and date .That the

time is initialization in the by switches s0,s1,s2,s3 .the switches connected with the

microcontroller port 1 pin p1.0,p1.1,p1.2,p1.3 .crystal 12 MHZ connected with

microcontroller pin 19 and 18 xtal 1 and xtal2 .

The real time clock chip DS1307 pin number 5 & 6 SDA and SCL connected

with the microcontroller port0 p0.0,p0.1pin number 38 & 39 shorted with the resister

10K R1&R2and connected 5V . microcontroller port 2.0 to port2.7 is connected with

the LCD data D0 to D7. The microcontroller port3.0 is connected with the LCD read

pin 4 . the port 3.1 connected with LCD write pin 5. Port 3.2 is connected with LCD

enable pin 6 . that we can take the output from the controller p3.2 to p3.7

according to the program . but in this circuit we connected the relay drivers circuit at

port 3.4 32KHZ crystal resonator are used for DS1307 . DS1307 ground pin

number 4 . positive supply at pin number 8 and 3V battery positive is connected withVbat , pin number 3 and then battery connected with pin number 4. For LCD pin

number 1 is for ground and pin number 2 is for VCC and pin number 3 is for VEE.

For microcontroller pin number 20 is ground. Pin number 31 ,9 &40 connected with

5V supply .

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EMBEDDED SYSTEM

An embedded system is some combination of computerhardware and software either fixed in capability or programmable

that is specially designed for a particular function. A computer

system designed to perform one or few dedicated function often

with real time computing constraints.

Embedded system are controlled by or more main

processing cores that is typically either a microcontroller or a DSP.

These are processors, arrays or other hardware using dedicated

logic or programming called FIRMWARE. They are designedaround a microcomputer which integrates memory and peripherals.

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MICROCONTROLLER

ATMEL 89C51FEATURES

COMPITABLE WITH MCS 51 PRODUCTS.

4K BYTES OF IN-SYSTEM REPROGRAMMABLE FLASH MEMORYENDURANCE:1,000

WRITE/ERASE CYCLES.

FULLY STATIC OPERATION:0 HZ TO 24 MHZ.

THREE-LEVEL PROGRAM MEMORY LOCK.

128x8-BIT INTERNAL RAM.

32 PROGRAMMABLE I/O LINES.

TWO 16-BIT TIMMER/COUNTERS.

SIX INTERRUPT SOURCES.

PROGRAMMABLE SERIAL CHANNELS.

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PROGRAM FLOW CHART

START

INITIAL LCD

INITIAL I2C

START I2C

SEND RTC ADDRESS

SEND INITIAL LOCATION

SEND SECONDS

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SEND MIN,HRS,DAYS,MONTHS,YEARS

SEND STOP

START I2C

SEND RTC ADDRESS FOR WRITE

SEND RTC ADDRESS FOR FIRST LOCATION

SEND READ ADDRESS

READ SEC,MIN,HRS,DAYS,MONTHS,YEARS

I2C STOP

SEND TO LCD

DELAY FOR 1 SEC

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CONCLUSION

This our project will be new attempt at the student level being a real

time clock project student will have wide exposure to the real time

I2Cprotocal project .

In our project real-time clock application is widely used

in the irrigation field ,it is easy to implement in the irrigation field , with lowcost, most effective and easy to maintains. our project will surely prevent the

hardships faced by a farmers when he works in irrigation field .

This project would not have been a great success without the guidance

and support of our department staff .we thank them whole

heartily.

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