REAL TIME CLOCK
BASED INDUSTRIAL AUTOMATION USING DALLAS RTC AND I2C PROTOCOL
TECHNICAL SPECIFICATIONS:
Title of the
project : Real Time Clock Based Industrial
Automation using Dallas RTC and I2C protocol
Domain : Embedded Systems Design
Software : Embedded C, Keil, Proload
Microcontroller : AT89S52
Power Supply : +5V,
500mA Regulated Power Supply
+12V,
500mA Regulated Power Supply
Display : a)
Seven Segment Display
RTC : DS 1307
Crystal : 11.0592MHz for MCU, 32.768 KHz for RTC
Input : 3X4 keypad
Advertising hoardings, commercial
sign boards, and street lights are generally switched on at 6:30 pm and switched off at 10:00 am because nobody is available
at the place in the morning to switch it off. But actual required time is 6:30pm to 11:30pm and 4:30am to 6:30am . Meantime i.e., from
11:30pm to 4:30am is not required, because the
public flow on the roads is almost nil in this time. And from 6:30am to 10:00am is also not required as the sun light is
available during this time. That means every day around nine hours of power is
wasted. This project gives the best solution for electrical energy wastage.
Also the manual operation of the lighting system is completely eliminated.
The Project AT89S52 Microcontroller
Based Energy saver for Commercial Lighting system with RTC DS1307 Interfacing
is an interesting project which uses AT89S52 microcontroller as its brain. This
project is very useful for commercial sign boards, advertising boards, street
lights for automation lighting system. This system switches on the lights only
at preprogrammed timings. As the DS1307 Real Time Clock chip with battery
back-up is used, there will be no disturbances for the programmed on/off
timings even in power failures.
3X4
keypad is provided for entering the required timings. This keypad made this
project user friendly. 4-digit seven segment display is provided to display the
alarm times and current time. DS1307 is interfaced to the microcontroller for
real timing performance. A 3V battery can be connected to DS1307 to avoid time
disturbances caused by power failures.
AT89S52 has inbuilt flash EPROM. Data stored remains in the memory even
after power failure, as the memory ensures reading of the latest saved settings
by the micro controller. It can retain data for more than ten years.
This
project uses regulated 5V, 500mA power supply. Unregulated 12V DC is used for
relay. 7805 three terminal voltage regulator is used for voltage regulation.
Bridge type full wave rectifier is used to rectify the ac out put of secondary
of 230/12V step down transformer.
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