This document outlines a project to develop an automatic street light controller using an AT89c51 microcontroller. It will include a photo sensor that switches the street lights on and off based on light levels, reducing power consumption. The project description provides a block diagram and overview of the main components, including the microcontroller, photo sensor, relays to control the lights, and an LCD display. It also describes the interfaces that will be used, such as the sensor, LCD, relays, switches and LED, and the software needed like a compiler and downloader.

1. PROJECT DEFINITION / SPECIFICATION
For
AUTOMATIC STREET LIGHT
CONTROLLER USING AT89c51
MICROCONTROLLER
A TECHNOLOGY PLAIN DOCUMENT
PROJECT DEFINITION AND SPECIFICATION………………………
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2.  SECTION 1: SPECIFICATION DATE
 SECTION 2: PROJECT TYPE
 SECTION 3: PROJECT DESCRIPTION
 SECTION 4: BLOCK DIAGRAM
 SECTION 5: PROJECT OUTLINE
 SECTION 6: INTERFACES USED
 SECTION 7: SOFTWARES USED
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PROJECT DEFINITION / SPECIFICATION
SECTION 1: SPECIFICATION DATE
SECTION 2: PROJECT TYPE
Microcontroller
(AT89C51)
hardware
design
with
software development (Device Driver) .
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3. SECTION 3: PROJECT DESCRIPTION
The aim of this project is to reduce the power consumption as
well as maintenance by providing the Photo sensor that switches the
light on and off automatically. The main feature of the Photo sensor
is it’s a light dependent resistor. A small hardware model, which is as
real as real world application, is built in this project. As the light falls
off these sensors switch on the street light and vice-versa.
SECTION 3: BLOCK DIAGRAM
Relay 1
Photo Sensor
Reset circuit
Oscillator
Circuit
ATMEL
89C51
Controller
Relay 2
Relay 3
Relay 4
Display1
16x2 LCD
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4. SECTION 5: PROJECT OUTLINE
 A brief introduction to internal architecture of micro controller.
 An over view of programming of micro controller.
 An overview on assembly language.
 An overview on interfacing 16X2 LCD.
 An overview of Buzzers.
 An overview on interface of switches and led.
SECTION 6: INTERFACES USED
 Sensors interfacing.
 16X2 LCD Interfacing.
 Relay interfacing
 ULN2003 interfacing
 Buzzer, switches, led interfacing with micro controller.
SECTION 7: SOFTWARES USED
 A Cross compiler for compiling and linking the code written for
AT89C51.
 Serial
communication
software
for
downloading
code
to
AT89C51.
 Operating system: Windows XP.
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