Home Automation using Digital Control

Home Automation using Digital Control

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Home Automation using Digital Control ABSTRACT:  Here is a teleremote circuit which enables switching ‘on’ and ‘off’ of appliances through telephone lines. It can be used to switch appliances from any distance, overcoming the limited range of infrared and radio remote controls.  The circuit can be used to switch up to nine appliances (corresponding to the digits 1 through 9 of the telephone key-pad). The DTMF signals on telephone instrument are used as control signals.  The digit ‘0’ in dtmf mode is used to toggle between the appliance mode and normal telephone operation mode. Thus the telephone can be used to switch on or switch off the appliances also while being used for normal conversation http://www.edgefxkits.com/

Home Automation using Digital Control Block Diagram:

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Home Automation using Digital Control Hardware Requirements:  POWER SUPPLY BLOCK  555 TIMER  RELAY  MT8870 DTMF DECODER  CD4049 INVERTER  CD4013 FLIP FLOP  MCT2E OPTO-ISOLATOR  74LS154  BC547  NPN TRANSISTOR

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Home Automation using Digital Control Power Supply:

230 V AC 50 Hz

Bridge rectifier

5v Regulator 5V DC Filter(470Âľf)

12V step down transformer

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Home Automation using Digital Control 555 TIMER The 555 Has Three Operating Modes: Monostable mode: ďƒ˜ In this mode, the 555 functions as a "one-shot". Applications include timers, missing pulse detection, switches, touch switches, frequency divider, capacitance measurement, pulse-width modulation (PWM) etc.

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Home Automation using Digital Control Astable: ďƒ˜ The 555 can operate as an oscillator. Uses include LED and lamp flashers, pulse generation, logic clocks, tone generation, security alarms, pulse position modulation, etc.

Bistable mode or Schmitt trigger: ďƒ˜ The 555 can operate as a flip-flop, if the DIS pin is not connected and no capacitor is used. Uses include bounce free latched switches, etc.

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Home Automation using Digital Control CD4049-Inverter: ďƒ˜ The CD4049 devices are inverting hex buffers, and feature logic level conversion using only one supply voltage (VCC) ďƒ˜ These devices are intended for use as CMOS to DTL/TTL converters and can drive directly two DTL/TTL loads

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Home Automation using Digital Control DTMF Decoder:  This circuit detects the dial tone from a telephone line and decodes the keypad pressed on the remote telephone.  Two distinct frequency tones make up the DTMF(dual tome multiple frequency), and hence the name.  The dialer and the telephone exchange communicate one way through the DTMF communication.  The tone generator and the tone decoder consist of a complete communication setup.  In this project, IC MT8870DE is used to decode the input dial tone to the dialed numbers. http://www.edgefxkits.com/

Home Automation using Digital Control  These digital bits are interfaced to a microcontroller for any application.  Pulse/dial tone communication.

method

is

used

in

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modern

telephone

 There is a dial tone generator on the caller side and a unique tone consisting of two audible tone frequency is generated when the user presses a button.  As an example, 697hz & 1209hz will be generated when key '1' is being pressed on the phone.  A decoder circuit is present on the receiver side, which decodes the tone to a digital code. http://www.edgefxkits.com/

Home Automation using Digital Control CD4013 Flip Flop: ďƒ˜ The CD4013B dual D-type flip-flop is a monolithic complementary MOS (CMOS) integrated circuit has two D-type flip-flops, which you can use independently ďƒ˜ A D-type flip-flop, also called a D-type bistable, is a subsystem with two stable states. Using appropriate input signals, you can trigger the flipflop from one state to the other.

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Home Automation using Digital Control OPTO-Isolator:  Opto coupler is a 6 pin IC.  It is a combination of 1 LED and a transistor.  when light falls on the Base-Emitter junction then it switches pin5 goes to zero.  When logic zero is given as input then the light doesn’t fall on transistor so it doesn’t conduct which gives logic zero as output.  When logic 1 is given as input then light falls on transistor so that it conducts, that makes transistor switched ON and it forms short circuit this makes the output is logic zero as collector of transistor is connected to ground. http://www.edgefxkits.com/

Home Automation using Digital Control OPTO-Isolator:

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Home Automation using Digital Control BC547:  The BC547 transistor is an NPN Epitaxial Silicon Transistor.  The BC547 transistor is a general-purpose transistor in small plastic packages. 

It is used in general-purpose switching and amplification BC847/BC547 series 45 V, 100 mA NPN general-purpose transistors.

 Whenever base is high, then current starts flowing through base and emitter and after that only current will pass from collector to emitter http://www.edgefxkits.com/

Home Automation using Digital Control 74LS154:  Each of these 4-line-to-16-line decoders utilizes TTL circuitry to decode four binary-coded inputs into one of sixteen mutually exclusive outputs when both the strobe inputs, G1 and G2, are LOW  The DE multiplexing function is performed by using the 4 input lines to address the output line, passing data from one of the strobe inputs with the other strobe input LOW. When either strobe input is HIGH, all outputs are HIGH.  These DE multiplexers are ideally suited for implementing highperformance memory decoders. All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design. http://www.edgefxkits.com/

Home Automation using Digital Control 74LS154:

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Home Automation using Digital Control Circuit Diagram:

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Home Automation using Digital Control Circuit Explanation: ďƒ˜ This system is designed to provide control of home appliances through landline by dialing the designated number for the particular load. Dialing can be done from the home phone or a call made to the home number from outside. This system is designed without engaging a programmable microcontroller but is based on digital logic using DTMF technology (Dual Tone multiple frequency) which receives the command from the landline phone to develop digital output. ďƒ˜ This digital signal is further processed to actuate switching mechanism through relay driver to turn on/off the loads/appliances. It can be used to switch appliances from anywhere, overcoming the limited range of other infrared and radio frequency type controls. This proposed system gives a new direction to the development of home automation. http://www.edgefxkits.com/

Home Automation using Digital Control Advantages:  High sensitive  Works with any Cell phone from anywhere  Low cost and reliable circuit  Coverage distance up to 10 meter

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Home Automation using Digital Control Applications:  Home appliances control  Hotel lights/ fans Control  Shops and Showrooms appliances control  Industrial appliances

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Home Automation using Digital Control Conclusion: ďƒ˜ The concept of this system can be extended in future by giving an acknowledgement message to the user by system on the status of loads by using GSM modem. ďƒ˜ Home Automation using Digital Control Project is very helpful in Home, Industrial,Hotels and Show rooms

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