Function:

1. The main them of the project is that it can be controlled by remote using IR communication.

2. Lifting speed can be controlled.

3. It can be controlled variable Distance through remote.

Application:

1. Screw Jacks are the ideal product to push, pull, lift, lower and position Heavy loads of anything from a couple.

2. It can be used as elevator.

3. Automobile application

4. When an industrial machine needs to move a cover or lid onto a dead stop

5. Solution for precise clamping in lowering applications in industrial machines.

Advantages:1. Can run at a Lifting Speed of up to 5.4 m/min which is 90 millimeters per second.

2. The majority of our worm gear screw jacks are self locking meaning enhanced safety and a cheaper solution.

3. The jacks must have an adjustable anti-backlash feature to assure accurate bidirectional positioning.4. linear motion transmission5. self-locking capacity6. shock-absorbent and silent

INDEX

1. INTRODUCTION

OBJECTIVE OF THE PROJECT

BLOCK DIAGRAM

2. DESCRIPTION OF THE PROJECT

BLOCK DIAGRAM DESCRIPTION

SCHEMATIC

3. HARDWARE DESCRIPTION

MICRO CONTROLLER

TV REMOTE POWER SUPPLY

RELAY

TSOP4. CONCLUSION

5. BIBLIOGRAPHY

INTRODUCTION:Objective: The main aim of this embedded application is to control electrical appliances using TV Remote.BLOCK DIAGRAM: SHAPE \* MERGEFORMAT

Description:

This application is in the area of embedded systems.

An embedded system is some combination of computer hardware and software, either fixed in capability or programmable, that is specifically designed for a particular function

Since the embedded system is dedicated to specific tasks, design engineers can optimize it reducing the size and cost of the product and increasing the reliability and performance. Embedded systems are controlled by one or more main processing cores that are typically either amicrocontrolleror a digital signal processor(DSP).Embedded systems control many devices in common use today.

Embedded C is an extension for the programming language C to support embedded processors, enabling portable and efficient application programming for embedded systems

IR remote acts as the transmitter in this project. When a button is pressed in the remote, the signal will be passed and received by the IR receiver TSOP Receiver. This signal is sent to the microcontroller which decodes the signal and performs the corresponding action in accordance with the button pressed in the remote. For example, if number 1 is pressed in the remote, the load 1 will be switched on/off according to the user requirement. The other tasks will be performed in the similar fashion using IR.

SCHEMATIC DIAGRAM:

Power Supply:

The power supply consists of ac voltage transformer, diode rectifier, ripple filter, and voltage regulators. The transformer is an AC device, which increases or decreases the input supply voltage without change in frequency. There are 2 types of transformers. One of Step-up and the other is Step-down. Here we are using a Step-down transformer, which decreases the 230 supply volts to 12 volts. The rectifier is a device which converts an AC voltage to the pulsating DC voltage. Here IN4007 diodes are used as rectifiers. A bridge type full wave rectifier is constructed using these diodes, as its efficiency is 81.2% and ripple factor is 0.482.

After the rectification, the output voltage signal contains both an average dc component and a time varying ac component called the ripple. To reduce or eliminate the ac component, one needs low pass filter(s). The low pass filter allows the dc component to pass through it but attenuate the ac at 60 Hz or its harmonics, i.e., 120 Hz. Here we use 1000Mf, 470Mf & 100Mf capacitors at the o/p and i/p of regulators. The 12v DC output of the filter is passed through voltage regulators of 7812 & 7805. 78 indicates that it is a regulator for positive voltage. There is a corresponding 79 model for negative voltage. 12 indicates that it has an output of 12 V. similarly we are connecting a 7805 to the 7812 regulator o/p, to generate 5volts. An LED in series to a 100ohms resistor is connected in parallel to the output voltage to indicate the supply. And also a switch is connected in series to the o/p voltage terminal to ON/OFF the supply.

8051 Micro controller

The first microprocessor introduced in 1981/1971, was made possible by high levels of integration of digital circuits. Continued integration of peripherals and memory on the same integrated circuit as the microprocessor core led to the creation of micro controllers. A micro controller is an integrated circuit composed of a CPU, various peripheral devices, and typically memory, all in one chip. Using one chip that contains all the necessary functions in place of a microprocessor and multiple peripheral chips has reduced the size and the power consumption of control oriented applications. A micro controller is different from a microprocessor both in hardware and software. In hardware it includes peripherals such as I/O, memory, and analog and digital interface. Micro controllers are more suited for small applications with specific control functions requiring specialized peripherals and interfaces. They are designed for process control and are required to interface to the real world processes. Many of the peripheral devices integrated on a micro controller are for that specific purpose. Analog to digital converters perform the task of converting an analog signal to digital for use by the CPU, and digital to analog converters perform the task of converting digital data into analog value and waveforms to control analog functions. In addition to the analog interface, micro controllers contain peripheral devices that enable them to communicate to other digital components within a system or to monitor and control digital functions. Communication interfaces, digital I/O and interrupt controllers fall into this category of peripheral devices. Other peripheral devices often included on the same chip include clocks and timers.

Relay:

A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism, but other operating principles are also used. Relays find applications where it is necessary to control a circuit by a low-power signal, or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits, repeating the signal coming in from one circuit and re-transmitting it to another. Relays found extensive use in telephone exchanges and early computers to perform logical operations. A type of relay that can handle the high power required to directly drive an electric motor is called a contactor. Solid-state relays control power circuits with no moving parts, instead using a semiconductor device to perform switching. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called "protection relays".

Latching relay:

Latching relay, dust cover removed, showing pawl and ratchet mechanism. The ratchet operates a cam, which raises and lowers the moving contact arm, seen edge-on just below it. The moving and fixed contacts are visible at the left side of the image.

A latching relay has two relaxed states (bistable). These are also called "impulse", "keep", or "stay" relays. When the current is switched off, the relay remains in its last state. This is achieved with a solenoid operating a ratchet and cam mechanism, or by having two opposing coils with an over-center spring or permanent magnet to hold the armature and contacts in position while the coil is relaxed, or with a remanent core. In the ratchet and cam example, the first pulse to the coil turns the relay on and the second pulse turns it off. In the two coil example, a pulse to one coil turns the relay on and a pulse to the opposite coil turns the relay off. This type of relay has the advantage that it consumes power only for an instant, while it is being switched, and it retains its last setting across a power outage. A remanent core latching relay requires a current pulse of opposite polarity to make it change state.

TSOP:Description:

The TSOP17.. series are miniaturized receivers for infrared remote control systems. PIN diode and preamplifier are assembled on lead frame, the epoxy package is designed as IR filter.

The demodulated output signal can directly be decoded by a microprocessor. TSOP17.. is the standard IR remote control receiver series, supporting all major transmission codes.

Features:_ Photo detector and preamplifier in one package

_ Internal filter for PCM frequency

_ Improved shielding against electrical field disturbance

_ TTL and CMOS compatibility

_ Output active low

_ Low power consumption

_ High immunity against ambient light

_ Continuous data transmission possible (up to 2400 bps)

_ Suitable burst length .10 cycles/burst

TV REMOTE:

A remote control is a component of an electronics device, most commonly a television set, used for operating the device wirelessly from a short line-of-sight distance.

The remote control can be contracted to remote or controller. It is known by many other names as well, such as converter clicker, didge, flipper, the tuner, the changer, or the button. Commonly, remote controls are Consumer IR devices used to issue commands from a distance to televisions or other consumer electronics such as stereo systems, DVD players and dimmers. Remote controls for these devices are usually small wireless handheld objects with an array of buttons for adjusting various settings such as television channel, track number, and volume. In fact, for the majority of modern devices with this kind of control, the remote contains all the function controls while the controlled device itself only has a handful of essential primary controls. Most of these remotes communicate to their respective devices via infrared (IR) signals and a few via radio signals. Television IR signals can be mimicked by a universal remote, which is able to emulate the functionality of most major brand television remote controls. They are usually powered by small AAA or AA size batteries.

CONCLUSION:The project SCREW JACKS CONTROL USING TV REMOTE has been successfully designed and tested. It has been developed by integrating features of all the hardware components used. Presence of every module has been reasoned out and placed carefully thus contributing to the best working of the unit.

Secondly, using highly advanced ICs and with the help of growing technology the project has been successfully implemented.

Finally we conclude that EMBEDDED SYSTEM is an emerging field and there is a huge scope for research and development.

BIBLIOGRAPHY

The 8051 Micro controller and Embedded

Systems

-Muhammad Ali Mazidi

Janice Gillispie Mazidi

The 8051 Micro controller Architecture,

Programming & Applications

-Kenneth J.Ayala

Fundamentals Of Micro processors and

Micro computers

-B.Ram

Micro processor Architecture, Programming

& Applications

-Ramesh S.Gaonkar

Electronic Components

-D.V.Prasad

Wireless Communications

- Theodore S. Rappaport

Mobile Tele Communications

- William C.Y. Lee

References on the Web:

www.national.comwww.atmel.comwww.microsoftsearch.comwww.geocities.com

TV REMOTE AS IR TRANSMITTER

LOAD 8

LOAD 1

Load driver and control

Reset

Circuit

Crystal

Oscillator

IR RECEIVER

8

0

5

1