CONSTRUCTION OF ROTARY LAWN MOWER

INTRODUCTION

The lawn mower is a mechanical device that literally shaves the surface of the grass by using a rapidly rotating blade or blades. It is a grass cutting machine. There are several kinds of grass cutting machine. Some are electro mechanical and some are manual. On this work, I have tried my best to construct an efficient lawn mower and tested it after construction.
ROTARY LAWN MOWER
A rotary lawn mower is a machine that uses revolving blades to cut a lawn at an even length.

OBJECTIVES OF THE PROJECT

1.To study the rotary lawn mower.
2.To construct a rotary lawn mower.
3.To use the mower for cutting grasses in flat land.

METHODOLOGY

1.Making frame.
2.Fitting the wheel with the frame.
3.Installing the motor on the frame.
4.Fitting the cutting blade with the motor shaft.
5.Assembling other necessary components.

DESIGN AND FABRICATION OF A THIEF DETECTOR SYSTEM FOR A PARTICULAR OBJECT (MOBILE)

OBJECTIVES

1.The aim of this project is to detect thief for a particular object such as mobile .
2.By user authentication code (a password) the owner can take easily his object .
3.To Design and fabricate the controller circuit .

KEY REQUIREMENT
1.Microcontroller(PIC16F84A)
2.IC (TX-2B)
3.IC (RX-2B)
4.Vero Board
5.NPN Transistor (BD135)
6.Switch
7.Crystal (4MHZ)
8.Infrared Transmitter
9.Infrared Receiver
10.OPAMP (LM324)
11.Variable resistor (10K)

ADVANTAGES

1.It detects thief instantly
2.Only owner can inform about this
3.It is easy to design and fabricate

AUTOMATIC OCCUPANCY OF COOLING FAN OPERATION

INTRODUCTION

1.As the world gets more and more technologically advanced, we find new technology coming in deeper and deeper into our personal lives even at home.

2.Human also mostly demands something that can be easily to be used without wasting energy.

3.This project has developed a system that automatically controls the fan in a room based on room occupancy,

OBJECTIVES

1.To develop an automatic fan system using infrared sensor to detect room occupants to turn the fan on and off when empty.

2. To develop an automatic fan system that can preview the status of the human presence in the liquid crystal display.

THEORY OF OPERATION

1.Power supply to convert 220V AC to DC.

2.Sensing units that convert body motion into analogue electrical signals.

3.Analogue comparator to convert analogue signals into digital signals.

4.Microcontroller to process these digital signals and send the appropriate command to the fan motor.

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