Introduction <ul><li>A  touchpad  (also  track pad ) is a pointing device consisting of specialized surface that can trans...
Operation & Development <ul><li>Touchpad’s operate in one of several ways including capacitance and conductance  sensing. ...
Applications <ul><li>Touchpad’s are primarily used in portable laptop computers. </li></ul><ul><li>ATM machine . </li></ul...
Main Component Of OTEA <ul><li>Touch pad </li></ul><ul><li>LM358 </li></ul><ul><li>Microcontroller </li></ul><ul><li>Volta...
Touch Pad <ul><li>Resistance touch is most commonly used because of its relatively low price and ability to use a range of...
LM358 (Low Power Dual Operational Amplifier) <ul><li>The LM358 series consists of two independent, high gains; internally ...
Connection Diagram
Features <ul><li>Internally frequency compensated for unity gain. </li></ul><ul><li>Large dc voltage gain: 100 dB. </li></...
Microcontroller <ul><li>The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash progr...
PIN DIAGRAM
Features <ul><li>Compatible with MCS-51™ Products. </li></ul><ul><li>4K Bytes of In-System Reprogrammable Flash Memory- En...
Voltage Regulator (LM7805c) <ul><li>A voltage regulator is an electrical regulator designed to automatically maintain a co...
Features <ul><li>Output Current up to 1A. </li></ul><ul><li>Output Voltage of 5. </li></ul><ul><li>Thermal Overload Protec...
 
TRANSCEIVER(MAX 232) <ul><li>A transceiver is a device that has both a transmitter and a receiver which are combined and s...
 
Pin Diagram MAX232
FEATURES <ul><li>120kbits/sec data rate. </li></ul><ul><li>Low power shutdown current: 1µA. </li></ul><ul><li>Designed for...
LCD(LIQUID CRYSTAL DISPLAY) <ul><li>A liquid crystal display (LCD) is an electronically-modulated optical device shaped in...
 
<ul><li>D0-D7 is the bi-directional data bus. </li></ul><ul><li>R/W determines if we read from or write to the LCD. </li><...
<ul><li>E pin enables or disables the LCD module. When Enable is low the LCD is disabled and When Enable pin is high the L...
Electromechanical Relays <ul><li>A simple electromagnetic relay is an adaptation of an electromagnets and It consists of a...
electromechanical relay Small relay as used in electronics
 
Type Of Relays <ul><li>Latching relay </li></ul><ul><li>Reed relay </li></ul><ul><li>Mercury-wetted relay </li></ul><ul><l...
Applications <ul><li>Control a high-voltage circuit with a low-voltage signal, as in some types of modems or audio amplifi...
ULN 2803APG <ul><li>The ULN2803APG / AFWG Series are high voltage, high current Darlington drivers comprised of eight NPN ...
Features <ul><li>Output current (single output) - 500 mA (Max.) </li></ul><ul><li>High sustaining voltage output -50 V (Mi...
Pin Digram
Model Digram
Circuit Digram
 
Conclusion <ul><li>The OTEA is operating on the resitivity of the hand and is easy to operate and process the required fun...
REFERENCES <ul><li>Ritchie W.K., “Different Display Device” British Telecommunication Engg.1(4), PP. 205-210; 1983. </li><...
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One Touch Electrical Appliances Control Using Microcontroller 89C51

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Check report at http://www.final-yearproject.com/2009/04/one-touch-electrical-appliances-control.html

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One Touch Electrical Appliances Control Using Microcontroller 89C51

  1. 2. Introduction <ul><li>A touchpad (also track pad ) is a pointing device consisting of specialized surface that can translate the motion and position of a user's fingers to a relative position on screen.  </li></ul>
  2. 3. Operation & Development <ul><li>Touchpad’s operate in one of several ways including capacitance and conductance sensing. </li></ul><ul><li>we prefer the resistance touch pad in some respect as compared to other touchpad. </li></ul><ul><li>Hotspots are the main configuration of the touch pad. </li></ul>
  3. 4. Applications <ul><li>Touchpad’s are primarily used in portable laptop computers. </li></ul><ul><li>ATM machine . </li></ul><ul><li>Washing Machine. </li></ul><ul><li>Photostat Machine. </li></ul>
  4. 5. Main Component Of OTEA <ul><li>Touch pad </li></ul><ul><li>LM358 </li></ul><ul><li>Microcontroller </li></ul><ul><li>Voltage Regulator </li></ul><ul><li>Transceiver </li></ul><ul><li>LCD </li></ul><ul><li>Electromechanical Relays </li></ul><ul><li>8 ULN 2803APG </li></ul>
  5. 6. Touch Pad <ul><li>Resistance touch is most commonly used because of its relatively low price and ability to use a range of input means. </li></ul>
  6. 7. LM358 (Low Power Dual Operational Amplifier) <ul><li>The LM358 series consists of two independent, high gains; internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. </li></ul>
  7. 8. Connection Diagram
  8. 9. Features <ul><li>Internally frequency compensated for unity gain. </li></ul><ul><li>Large dc voltage gain: 100 dB. </li></ul><ul><li>Wide power supply range: </li></ul><ul><li>Single supply: 3V to 32V </li></ul><ul><li>dual supplies : ±1.5V to ±16V </li></ul><ul><li>Large output voltage swing. </li></ul>
  9. 10. Microcontroller <ul><li>The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash programmable and erasable read only memory (PEROM). </li></ul><ul><li>The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set and pin out. </li></ul>
  10. 11. PIN DIAGRAM
  11. 12. Features <ul><li>Compatible with MCS-51™ Products. </li></ul><ul><li>4K Bytes of In-System Reprogrammable Flash Memory- Endurance: 1,000 Write/Erase cycles . </li></ul><ul><li>Fully Static Operation: 0 Hz to 24 MHz. </li></ul><ul><li>Three-level Program Memory Lock. </li></ul><ul><li>128 x 8-bit Internal RAM. </li></ul><ul><li>32 Programmable I/O Lines. </li></ul><ul><li>Two 16-bit Timer/Counters. </li></ul><ul><li>Six Interrupt Sources. </li></ul>
  12. 13. Voltage Regulator (LM7805c) <ul><li>A voltage regulator is an electrical regulator designed to automatically maintain a constant voltage level. </li></ul><ul><li>The LM78XX series of three terminal positive regulator. </li></ul><ul><li>Each type employs internal current limiting, thermal shut down and safe operating area protection. </li></ul>
  13. 14. Features <ul><li>Output Current up to 1A. </li></ul><ul><li>Output Voltage of 5. </li></ul><ul><li>Thermal Overload Protection. </li></ul><ul><li>Short Circuit Protection. </li></ul><ul><li>Output Transistor Safe Operating Area Protection. </li></ul>
  14. 16. TRANSCEIVER(MAX 232) <ul><li>A transceiver is a device that has both a transmitter and a receiver which are combined and share common circuitry or a single housing. </li></ul><ul><li>If no circuitry is common between transmit and receive functions, the device is a transmitter-receiver. </li></ul><ul><li>An electronic switch allows the transmitter and receiver to be connected to the same antenna and prevents the transmitter output from damaging the receiver. </li></ul>
  15. 18. Pin Diagram MAX232
  16. 19. FEATURES <ul><li>120kbits/sec data rate. </li></ul><ul><li>Low power shutdown current: 1µA. </li></ul><ul><li>Designed for RS-232 and V.28 Applications. </li></ul><ul><li>Three state TTL/CMOS receiver outputs. </li></ul><ul><li>0.1µF to 10µF external capacitors. </li></ul>
  17. 20. LCD(LIQUID CRYSTAL DISPLAY) <ul><li>A liquid crystal display (LCD) is an electronically-modulated optical device shaped into a thin. </li></ul><ul><li>flat panel made up of any number of color or monochrome pixels filled with liquid crystals and arrayed in front of a light source or reflector. </li></ul><ul><li>It is often utilized in battery-powered electronic devices because it uses very small amounts of electric power. </li></ul>
  18. 22. <ul><li>D0-D7 is the bi-directional data bus. </li></ul><ul><li>R/W determines if we read from or write to the LCD. </li></ul><ul><li>RS stands for &quot;register select” RS=0 means that the instruction register is selected. </li></ul><ul><li>RS=1 means that the data register is selected. </li></ul>
  19. 23. <ul><li>E pin enables or disables the LCD module. When Enable is low the LCD is disabled and When Enable pin is high the LCD is enabled. </li></ul><ul><li>Vo pin is for adjusting the contrast of the display. </li></ul><ul><li>Vdd and Vss are the power supply pins. </li></ul><ul><li>  </li></ul>
  20. 24. Electromechanical Relays <ul><li>A simple electromagnetic relay is an adaptation of an electromagnets and It consists of a coil of wire surrounding a soft iron core. </li></ul><ul><li>An iron yoke provides a low reluctance path for magnetic flux, a moveable iron armature and a set of contacts. </li></ul><ul><li>The armature is hinged to the yoke and mechanically linked to a moving contact or contacts. </li></ul><ul><li>It is held in place by a spring so that when the relay is de-energized there is an air gap in the magnetic circuit. </li></ul>
  21. 25. electromechanical relay Small relay as used in electronics
  22. 27. Type Of Relays <ul><li>Latching relay </li></ul><ul><li>Reed relay </li></ul><ul><li>Mercury-wetted relay </li></ul><ul><li>Polarized relay </li></ul><ul><li>Machine tool relay </li></ul><ul><li>Solid-state relay </li></ul><ul><li>Overload protection relay </li></ul>
  23. 28. Applications <ul><li>Control a high-voltage circuit with a low-voltage signal, as in some types of modems or audio amplifiers. </li></ul><ul><li>Control a high-current circuit with a low-current signal, as in the starter solenoid of an automobile. Detect and isolate faults on transmission and distribution lines by opening and closing circuit breaker (protection relays). </li></ul><ul><li>Isolate the controlling circuit from the controlled circuit when the two are at different potentials. </li></ul>
  24. 29. ULN 2803APG <ul><li>The ULN2803APG / AFWG Series are high voltage, high current Darlington drivers comprised of eight NPN Darlington pairs. </li></ul><ul><li>All units feature integral clamp diodes for switching inductive loads. Applications include relay, hammer, lamp and display (LED) drivers. The suffix (G) appended to the part number represents a Lead(Pb)-Free product. </li></ul>
  25. 30. Features <ul><li>Output current (single output) - 500 mA (Max.) </li></ul><ul><li>High sustaining voltage output -50 V (Min.) </li></ul><ul><li>Output clamp diodes </li></ul><ul><li>Inputs compatible with various types of logic. </li></ul><ul><li>Package Type−APG: DIP−18pin </li></ul>
  26. 31. Pin Digram
  27. 32. Model Digram
  28. 33. Circuit Digram
  29. 35. Conclusion <ul><li>The OTEA is operating on the resitivity of the hand and is easy to operate and process the required function. </li></ul><ul><li>The OTEA functioning is controlled by the microcontroller AT89C51 for the required controlled function at the output so that we can get the desired result. </li></ul><ul><li>most widely used application of the touch pad is in a laptop in the case where we can not have a mouse all the time in our bag. </li></ul>
  30. 36. REFERENCES <ul><li>Ritchie W.K., “Different Display Device” British Telecommunication Engg.1(4), PP. 205-210; 1983. </li></ul><ul><li>Smith D.R., “Different Microcontroller IC’s IEEE Comm. Mag. 24(1), PP. 9-15; 1986. </li></ul><ul><li>Trischitta P.R. & Chen D.T.S., “Opto Electronics Devices”, IEEE Comm. Mag., PP.16-21; May 1989 </li></ul><ul><li>D.F. Stout Handbook of Operational Amplifier Circuit Design (McGraw-Hill, 1976, ISBN 007061797X). </li></ul><ul><li>The Encyclopedia of Electronic Circuits - Volume 1 to 7. Rudolf Graf's. </li></ul>

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