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1   Designed by-Yogesh Kumar
   How to design a electronic system ?
       Block diagrams
       Electronic circuit
       HACS
       Mobile remote control
       DTMF & Cell phone
       Mobile network
       Signal Decoding
       MCU
       Interfacing MCU & 220VAC Mains supply
       Conclusion


2                                               Designed by-Yogesh Kumar
   Pick a problem from daily life.
       Check what you have & what you want ?
       Design flow of process.
       Draw block diagrams.
       Explore each process as you can.
       Now its time to design electronic circuit. Choose electronic
        components as per requirement.
       Assemble & connect complete system circuit.
       Test it , Now your system is ready to work.




3                                                    Designed by-Yogesh Kumar
Block diagrams


      INPUT     PROCESS               PROCESS



                     SYSTEM FUNCTION
     You Have




                                        OUTPUT

                           You Want
4                               Designed by-Yogesh Kumar
Electronic circuit

       Clock Generator   Decade Counter




5                          Designed by-Yogesh Kumar
HACS
      [Home Automation Control System]

     Home Appliance Control System accessed by a remote device such
    as mobile phone or a palm-top(PC) to allow a home owner to control,
    monitor and coordinate home appliances.
    The following picture gives an
    overview of how the system is works.
     HACS
     is a system which provides
     various services to remotely
    operate on home appliances.
    The HACS system receives
     commands from remote devices that are
    manipulated by user.
6                                                 Designed by-Yogesh Kumar
Need of Automation

    1.   Saves time              When: you are in a traffic jam
    2.   Save money (Long run)   on the highway
    3.   Self Maintenance        What: You set microwave
                                 oven in a slow cooking mode
    4.   Security
    5.   Makes life easy




            Oven
7                                   Designed by-Yogesh Kumar
Mobile Network & Remote Control

    SMS Based           DTMF-
    DTMF Based          High Compatibility with all cell       MS
    GSM Data logging    phone models
                         Very cheap ,Easy to implement




                   BTS               GSM / CDMA
                                      NETWORK
                                                               BTS




8     MS
                                                Designed by-Yogesh Kumar
DTMF Signals

       DTMF is a signalling system for identifying the keys or better say the
        number dialled on a pushbutton or DTMF keypad.
        DTMF is a multi frequency tone dialling system used by the push
        button keypads in telephone and mobile sets to convey the number or
        key dialled by the caller.
        DTMF has enabled the long distance signalling of dialled numbers in
        voice frequency range over telephone lines.
        DTMF (Dual tone multi frequency) as
         the name suggests uses a combination of two
         sine wave tones to represent a key.
        These tones are called row and column
         frequencies as they correspond to the layout of
         a telephone keypad.
9                                                       Designed by-Yogesh Kumar
DTMF signaling application

        DTMF tones are thus mainly used at the telephone switching
         centres for detection of dialled/called number.

        IVR systems , Call centers ,Security systems.

        DTMF tones were also used by terrestrial stations for turning on
         and shutting off remote transmitters.




10                                                  Designed by-Yogesh Kumar
DTMF to BCD decoding

     3.5 mm Jack




                   3.5 mm audio
                     connector




11                                Designed by-Yogesh Kumar
220VAC Mains Interfacing




12                         Designed by-Yogesh Kumar
Mobile Remote Control System

                                                                   DTMF Decoder chip

     To/from Phone Jack
     (Output/Input)
                            Data Access
                          Arrangement Chip




                            Voice Chip




                                                            Microcontroller




                                         Outputs



                                              SS Relay        SS Relay         SS Relay




                                             Device No. 1   Device No. 2      Device No. 3
13                                                                                           Designed by-Yogesh Kumar
MCU Electronic Circuit




14                            Designed by-Yogesh Kumar
Project at a glance




15                         Designed by-Yogesh Kumar
Want to ask ???




     Any doubts or queries……


16                             Designed by-Yogesh Kumar
17   Designed by-Yogesh Kumar

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DTMF (Mobile) Based Automation

  • 1. 1 Designed by-Yogesh Kumar
  • 2. How to design a electronic system ?  Block diagrams  Electronic circuit  HACS  Mobile remote control  DTMF & Cell phone  Mobile network  Signal Decoding  MCU  Interfacing MCU & 220VAC Mains supply  Conclusion 2 Designed by-Yogesh Kumar
  • 3. Pick a problem from daily life.  Check what you have & what you want ?  Design flow of process.  Draw block diagrams.  Explore each process as you can.  Now its time to design electronic circuit. Choose electronic components as per requirement.  Assemble & connect complete system circuit.  Test it , Now your system is ready to work. 3 Designed by-Yogesh Kumar
  • 4. Block diagrams INPUT PROCESS PROCESS SYSTEM FUNCTION You Have OUTPUT You Want 4 Designed by-Yogesh Kumar
  • 5. Electronic circuit Clock Generator Decade Counter 5 Designed by-Yogesh Kumar
  • 6. HACS [Home Automation Control System] Home Appliance Control System accessed by a remote device such as mobile phone or a palm-top(PC) to allow a home owner to control, monitor and coordinate home appliances. The following picture gives an overview of how the system is works. HACS is a system which provides various services to remotely operate on home appliances. The HACS system receives commands from remote devices that are manipulated by user. 6 Designed by-Yogesh Kumar
  • 7. Need of Automation 1. Saves time When: you are in a traffic jam 2. Save money (Long run) on the highway 3. Self Maintenance What: You set microwave oven in a slow cooking mode 4. Security 5. Makes life easy Oven 7 Designed by-Yogesh Kumar
  • 8. Mobile Network & Remote Control SMS Based DTMF- DTMF Based High Compatibility with all cell MS GSM Data logging phone models Very cheap ,Easy to implement BTS GSM / CDMA NETWORK BTS 8 MS Designed by-Yogesh Kumar
  • 9. DTMF Signals  DTMF is a signalling system for identifying the keys or better say the number dialled on a pushbutton or DTMF keypad.  DTMF is a multi frequency tone dialling system used by the push button keypads in telephone and mobile sets to convey the number or key dialled by the caller.  DTMF has enabled the long distance signalling of dialled numbers in voice frequency range over telephone lines.  DTMF (Dual tone multi frequency) as the name suggests uses a combination of two sine wave tones to represent a key. These tones are called row and column frequencies as they correspond to the layout of a telephone keypad. 9 Designed by-Yogesh Kumar
  • 10. DTMF signaling application  DTMF tones are thus mainly used at the telephone switching centres for detection of dialled/called number.  IVR systems , Call centers ,Security systems.  DTMF tones were also used by terrestrial stations for turning on and shutting off remote transmitters. 10 Designed by-Yogesh Kumar
  • 11. DTMF to BCD decoding 3.5 mm Jack 3.5 mm audio connector 11 Designed by-Yogesh Kumar
  • 12. 220VAC Mains Interfacing 12 Designed by-Yogesh Kumar
  • 13. Mobile Remote Control System DTMF Decoder chip To/from Phone Jack (Output/Input) Data Access Arrangement Chip Voice Chip Microcontroller Outputs SS Relay SS Relay SS Relay Device No. 1 Device No. 2 Device No. 3 13 Designed by-Yogesh Kumar
  • 14. MCU Electronic Circuit 14 Designed by-Yogesh Kumar
  • 15. Project at a glance 15 Designed by-Yogesh Kumar
  • 16. Want to ask ??? Any doubts or queries…… 16 Designed by-Yogesh Kumar
  • 17. 17 Designed by-Yogesh Kumar