TOUCH SCREEN AND RF BASED HOME AUTOMATION Project Title TOUCH SCREEN AND RF BASED HOME AUTOMATION Under the Guidance of Submitted by

ABSTRACT Home automation has become even simpler with touch screen technology. Owners familiar with the icon system appreciate touch screens that make home automation systems user friendly. Touch screens are also designed for commercial, industrial and medical systems. The main objective of the project is automation of the industrial loads using a touch panel LCD using RF technology. In order to achieve this, a touch panel is interfaced to the microcontroller on transmitter side which sends the commands ON/OFF to receiver where loads are connected. By touching the specified position on this module the loads can be turned ON/OFF through wireless. The microcontroller used here is of 8051 family. The loads are interfaced to the Microcontroller using opto-isolators and triacs.

BLOCK DIAGRAM Transmitter section

Receiver Section

HARDWARE REQUIREMENTS POWER SUPPLY BLOCK MICROCONTROLLER AT89S52/AT89C51 TOUCH PANEL RF TRANSMITTER & RF RECEIVER (HT12E/HT12D) OPTO-ISOLATOR TRIAC REGULATORS CRYSTAL OSCILLATOR DIODES RESISTORS CAPACITORS

POWER SUPPLY Bridge rectifier 5v Regulator 230 V AC 50 Hz 5V DC Filter(470µf) 12V step down transformer

It is a smaller computer Has on-chip RAM, ROM, I/O ports... MICROCONTROLLER It is a smaller computer Has on-chip RAM, ROM, I/O ports... RAM ROM I/O Port Timer Serial COM Port Microcontroller CPU A single chip

INTERNAL STRUCTURE OF A MICRO CONTROLLER-AT89S52/51 CPU On-chip RAM On-chip ROM for program code 4 I/O Ports Timer 0 Serial Port OSC Interrupt Control External interrupts Timer 1 Timer/Counter Bus Control TxD RxD P0 P1 P2 P3 Address/Data Counter Inputs

Features of AT89S51/52 Compatible with MCS®-51 Products 8K Bytes of In-System Programmable (ISP) Flash Memory Endurance: 10,000 Write/Erase Cycles 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz 256 x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Eight Interrupt Sources Full Duplex UART Serial Channel Interrupt Recovery from Power-down Mode Watchdog Timer Dual Data Pointer

Pin Description

RF Transmitter and Receiver RF modules are normally divided into three groups, RF transmitter module, RF receiver module and RF transceiver module 433MHz ASK transmitter and receiver is used for the remote control. Fig : RF Transmitter Fig RF Receiver

Features of RF Range in open space(Standard Conditions) : 100 Meters RX Receiver Frequency : 433 MHz RX Typical Sensitivity : 105 Dbm RX Supply Current : 3.5 mA RX IF Frequency : 1MHz Low Power Consumption Easy For Application RX Operating Voltage : 5V TX Frequency Range : 433.92 MHz TX Supply Voltage : 3V ~ 6V TX Out Put Power : 4 ~ 12 Dbm

HT 12 ENCODER Operating voltage is 2.4V~12V for the HT12E. Features Operating voltage is 2.4V~12V for the HT12E. Low power and high noise immunity CMOS technology Low standby current: 0.1_A (typ.) at VDD=5V HT12A with a 38kHz carrier for infrared transmission medium Minimum transmission words are Four words for the HT12E Built-in oscillator needs only 5% resistor Data code has positive polarity Minimal external components HT12A/E: 18-pin DIP/20-pin SOP package

HT12 DECODER Features Operating voltage: 2.4V~12V. Low power and high noise immunity CMOS technology. Low standby current. Capable of decoding 12 bits of information. Binary address setting. Address/Data number combination for HT12D: 8 address bits and 4 data bits. Valid transmission indicator Minimal external components 18-pin DIP, 20-pin SOP package

40 Pin GRAPHICAL TOUCH SCREEN

Contd…. A touch pad is a device for pointing (controlling input positioning) on a computer display screen. It is an alternative to the mouse. Originally incorporated in laptop computers, touch pads are also being made for use with desktop computers. A touch pad works by sensing the user's finger movement and downward pressure.

BC547 (NPN –Transistor) The BC547 transistor is an NPN Epitaxial Silicon Transistor. It is used in general-purpose switching and amplification BC847/BC547 series 45 V, 100 mA NPN general-purpose transistors. The ratio of two currents (Ic/Ib) is called the DC Current Gain of the device and is given the symbol of hfe or nowadays Beta, (β).

The current gain from the emitter to the collector terminal, Ic/Ie, is called Alpha, (α), and is a function of the transistor itself

TRIAC TRIAC, from Triode for Alternating Current, is a generalized trade name for an electronic component which can conduct current in either direction when it is triggered (turned on), and is formally called a bidirectional triode thyristor or bilateral triode thyristor.

Opto-isolator Opto-coupler MOC3061/63 an LED SCR type combination. Opto coupler is a 6 pin IC. Additionally while using this IC with microcontroller and one LED can be connected in series with IC LED to indicate when high is given from micro controller such that we can know that current is flowing in internal LED of the opto-IC. When logic high is given current flows through LED from pin 1 to 2 .So in this process LED light falls on SCR causing 6 & 4 to close only at the zero cross of the supply voltage.

Contd…. During each half cycle current flows through scr gate, external series resistor and through opto-scr for the main thyristor / triac to trigger for the load at the beginning of the supply cycle always to operate.

Touch screen rf load control_transmiter SCHEMATIC DIAGRAM Touch screen rf load control_transmiter

RF LOAD CONTROL RECEIVER

Software Requirements Keil an ARM Company makes C compilers, macro assemblers, real-time kernels, debuggers, simulators, integrated environments, evaluation boards, and emulators for ARM7/ARM9/Cortex-M3, XC16x/C16x/ST10, 251, and 8051 MCU families. Compilers are programs used to convert a High Level Language to object code. Desktop compilers produce an output object code for the underlying microprocessor, but not for other microprocessors.

i.e the programs written in one of the HLL like ‘C’ will compile the code to run on the system for a particular processor like x86 (underlying microprocessor in the computer). For example compilers for Dos platform is different from the Compilers for Unix platform  So if one wants to define a compiler then compiler is a program that translates source code into object code.

Applications

Advantages

Conclusion

Future scope

BIBILOGRAPHY “The 8051 Microcontroller and Embedded systems” by Muhammad Ali Mazidi and Janice Gillispie Mazidi , Pearson Education. ATMEL 89S52 Data Sheets. www.atmel.com www.beyondlogic.org www.wikipedia.org www.howstuffworks.com www.alldatasheets.com

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