Power Saver Using Rtc

Topics: Clock signal, Central processing unit, Clock rate Pages: 35 (11177 words) Published: August 27, 2013

In this competitive world human cannot spare his time to perform his daily activities manually without any fail. The most important thing he forgets is to switch off the room lights wherever not required. With this, even the power will be wasted up to some extent. This can be seen more effectively in the case of commercial sign boards. This project gives the best solution for electrical power wastage. Also the manual operation is completely eliminated. This project provides different on and off timings to operate the lights around sign boards.. The user can once program these timings according to his requirements and these timings will be stored in EEPROM and cannot be erased unless the user wishes to change it again.
This project is very useful for commercial sign boards, advertising boards. 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.

Three switches are provided for entering the required timings. These switches made this project user friendly. 16X2 LCD 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. The user can even change the preprogrammed timings and set the timings according to his requirements.

Microprocessors and microcontrollers are widely used in embedded systems products. Microcontroller is a programmable device. A microcontroller has a CPU in addition to a fixed amount of RAM, ROM, I/O ports and a timer embedded all on a single chip. The fixed amount of on-chip ROM, RAM and number of I/O ports in microcontrollers makes them ideal for many applications in which cost and space are critical.

The Intel 8051 is Harvard architecture, single chip microcontroller (µC) which was developed by Intel in 1980 for use in embedded systems.

It was popular in the 1980s and early 1990s, but today it has largely been superseded by a vast range of enhanced devices with 8051-compatible processor cores that are manufactured by more than 20 independent manufacturers including Atmel, Infineon Technologies and Maxim Integrated Products.

8051 is an 8-bit processor, meaning that the CPU can work on only 8 bits of data at a time. Data larger than 8 bits has to be broken into 8-bit pieces to be processed by the CPU. 8051 is available in different memory types such as UV-EPROM, Flash and NV-RAM.

Features of AT89S52:
* 8K Bytes of Re-programmable Flash Memory.
* RAM is 256 bytes.
* 4.0V to 5.5V Operating Range.
* Fully Static Operation: 0 Hz to 33 MHz’s
* 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.
* Low-power Idle and Power-down Modes.
* Interrupt recovery from power down mode.
* Watchdog timer.
* Dual data pointer.
* Power-off flag.
* Fast programming time.
* Flexible ISP programming (byte and page mode).

The AT89s52 is a low-voltage, high-performance CMOS 8-bit microcomputer with 8K bytes of Flash programmable memory. The device is manufactured using Atmel’s high density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set. The on chip flash allows the program memory to be reprogrammed in system or by a conventional non volatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89s52 is a powerful microcomputer, which provides a highly flexible and cost-effective solution to many embedded control applications. In addition, the AT89s52 is designed...
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