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DESCRIPTIONUsed for presentation at AKG College of Engineering on March 12,2010.
- 1. GVC Systems Pvt LtdElectronics - Embedded - Entreprenurship
2. Agenda About me About Embedded & Electronics About You Why I am here Inviting you to work with us 3. Me - Professional Vinay Chaddha. Electronics Hobbyist. Author. Innovator. Passionate about learning and sharing. Filed 3 patents, Shared ve successful commercial projects. Many copy rights. Developed over 200 comemrcially successful projects. 4. CONSTRUCTION CONSTRUCTION Remote-controlled centre values of treble, balance and bass. Volume will be set at 50 per cent of the maximum value and the relayAudio Processor Using will be off. Loudness and mute will also remain in the off mode. A remote hand- set can be used to change the settings as desired.Caller-ID Unit Using transmit the telephone number of call- Microcontroller Audio controller. TDA7315 is a ing party just before the first ring whilesingle-chip I2C bus-compatible audio in systems used in USA and China, the controller which is used to control all data relating to the calling number isfunctions of the audio amplifier. StereoMicro-controller sent between first and the second rings.audio input from the preamplifier is fed The number of calling party in India is OOto the IC input. A microcontroller canSAG transmitted by MTNL/DoT exchanges VINAY CHADDHA G.S. in DTMF codes.PARTS LIST ILLO N Two documents containing stan-Semiconductors:M . DHA.P.Sdards and specifications issued by DoTsIC1 - TDA7315 digitally controlledVINAY CHADDHAost hi-fi audio CD systems and 3. audio processor Telecommunications Engineering Cen-nowadays are available withIC2 - MC68HC705KJ1CP Motorola tre (TEC) in the form of Generic re-Tremote control. However, nomicrocontroller (GVC-AMP- he facility of knowing your tended to the normal telephone usersquirements and Interface require- such circuit is available for adding to Description 257) callers telephone number beforealso in Delhi, Mumbai and some otherments for Subscriber service unit forMemory. 24C02 is an I2C bus compat- IC3 - 24C02 I2C serial EEPROM the AF power amplifiers made as hobby IC4 - 7805 fixed regulator +5V answering the call, which has cities of India through MTNL and DoTcalling line identification presentation ible 2k-bit EEPROM, organised as 256 projects. The design of such an add-onIC5 - 7809 fixed regulator +9Vbeen available to cellular phone users since 1st January.(SSU for CLIP) are available from TEC,x 8 bits. It can retain data for a period circuit along with remote control is pre- IC6 - PD6121 infrared remoteonly in India so far, has now been ex- MTNL/DoT telephone exchangesKhursheed Lal Bhawan, Janpath, of more than ten years, including thecontrol sented here. It can be used by hobby- T1,T2,T3- BC547 npn transistor ists as an attachment to their audio current settings of volume, treble, bal- T4- 2SC2001 npn transistor power amplifiers.ance, bass, as well as the on/off status D0-D7 - Red LED This design is based on audio con- of the main amplifier unit or the relayD8, D10-D11 - 1N4007 rectifier diode troller TDA7315 from SGS-THOMSON status. The various audio parameters D9- 8.2V,0.5W zenercan be stored in just six bytes. D12 - IR LED andMotorola microcontroller MC68HC705KJ1. The microcontroller, Mains power failure is quite com- Resistors (all 1/4W, 5% metal/carbon film, unless stated otherwise) after programming with the specificmon in India. This does not allow the R1,R2,R15,R16- 10-kilo-ohm software code for the current applica- last settings of volume, tone and bal- R3,R4,R14 - 1-kilo-ohm tion, has been renamed GVC-AUD-ance to remain intact. To overcome thisR0,R5-R9, 257. Other construction projects bythe microcontroller unit (MCU) mustR12,R13 - 330-ohm the author using the same series ofstore all audio settings of the user inR10,R11 - 5.6-kilo-ohmmemory (EEPROM). The memory en-R17 - 2-ohm, 0.5W microcontrollers, which can be referred R18,R19 - 200-kilo-ohm to for additional details, have been pub-sures that even after a power trip, the Capacitors: lished in EFY in Jun. 97 (Set-Top Con-MCU will read the latest saved settings C1- 10F, 16V electrolytic verter) and Apr. 99 (Caller ID). In ad- from the EEPROM. C2-C4,C7, dition to audio controller and Using two lines, SCL (serial clock)C19,C20 - 0.1F ceramic disc microcontroller the circuit comprisesand SDA (serial data), the microcon- C15,C16,C9, the following standard parts that aretroller can read and write six bytes for C10,C11,C13 - 0.1F polyester C5,C6 - 33pF ceramic disc used in any normal system: all the audio parameters. For more de- C8- 22F, 25V electrolytic 1. Power supplytails on I2C bus and memory interfac-C12,C14 - 2.7nF polyster 2. LED indicator panel to indicate ing, please refer to Caller ID construc- C17,C18 - 2.2F, 16V electrolytic status/keys pressedtion project in Apr. 99 issue of EFY. C21,C22 - 220pF ceramic discAt power on, the last-saved audioC23 - 10F, 50V electrolytic 3. Relay to switch on/off the supply to the power amplifier or the main unitsettings are read by the MCU. In caseMiscellaneous:memory IC cannot be read by theRL1 - 12V, 150 ohm, SPST relay The following parts are used in re- OEN Pt. No. 57DP-12-1C6 mote systems for VCR, TV, etc: microcontroller, volume LED will blink XTAL- 4MHz quartz crystal 1. Memory (24C02). three times to indicate the problem. The Y - 455kHz, ceramic resonator 2. Remote handset with 12 keys possible reasons could be either a bad - Battery 1.5V, pencil cell 3. IR receiver for remote operationmemory IC, or a discontinuity/shorting - IR sensor module - Remote control handset, Functionality of these parts is ex-of its tracks, or improper insertion ofcomplete with keyboard plained below with reference to Figs 1 the IC in its socket.- Connectors for audio input- The author is the proprietor of GVC Systems, Under the circumstances, the unitoutput and power supplywill still work, but it will not remem-- 12V DC, 250mA battery Noida. He can be approached through e-mail eliminator at firstname.lastname@example.org the last settings and will select the52 ELECTRONICS FOR YOU SEPTEMBER '99Fig. 1: Complete circuit diagram of caller-ID unit CC O NTS T RTU O N I O N ONS RUC I CT44ELECTRONICS FOR YOU APRIL '99MICROCONTROLLER-BASED CMYKCONSTRUCTION MARIL KU ACCESS CONTROL SYSTEM SUN BEVERAGE VENDINGVINAY CHADDHA*the password data for over ten years.PARTS LISTMACHINE CONTROLLERThe user can modify the password asSEO SANI THSemiconductors:ecurity is a prime concern in our day-well as relay-activation time duration forIC1(U1)- MC68HC705KJ1to-day life. Everyone wants to be asdoor entry. This version of softwaremicrocontrollermuch secure as possible. An access- enables use of the unit even without theIC2 (U2) - ST24C02 I2C EEPROMcontrol system forms a vital link in a secu-I2C EEPROM. (However, without EEPROM, IC3 (MN1)- MN1280 reset stabiliser VINAY CHADDHArants and even in companies. Press a allow compact size, higher reliability,rity chain. The microprocessor-based digi-the password and relay-activation timeIC4 (Reg1) - 7805 +5V regulatorswitch and the machine delivers a hotlower cost and multiple functionalities. T1, T2 - BC547 npn transistor Btal lock presented here is an access- duration will be reset to default values everage vending machines are cup of your favourite drink. This tea/coffee/soup vending ma- (Q1, Q2)control system that allows only authorisedon interruption of the power supply.) D1, D2 - 1N4007 rectifier diode commonplace at railway sta- This looks quite a simple operation chine controller uses Freescales latest persons to access a restricted area.LED1 - Red LED tions, airports, fast-food restau- but has a very complex logic behindMC908JL16 microcontroller chip. Theit: It involves use of controller is programmable and user-Hardware detailsResistors (all -watt, 5% carbon, unlesstwelve precision timersfriendly. You can set the quantity ofSystem overview Fig. 2 shows the access control circuit. Itsstated otherwise):R1-R6- 10-kilo-ohmand four counters apartthe beverages through a button switchThe block diagram of the access-control main components are a microcontroller,R7-R9- 1-kilo-ohmfrom physical devices like provided on the front panel of the con-system is shown in Fig. 1. The system I2C memory, power supply, keypad, relay,Capacitors:display, solenoid and mo-troller as per your requirements. Thus,comprises a small electronic unit with aand buzzer.C1, C2 - 33pF ceramic disktor to deliver water and cups of any size can be filled at anynumeric keypad, which is fixed outside theM ic r ocon t r olle r . The 16-pinC3, C4,premixed tea/coffee/soup time.entry door to control a solenoid-operated MC68HC705KJ1 microcontroller from C6, C7 - 0.1F ceramic diskpowder in exact quantitylock. When an authorised person enters aMotorola has the following features:C5 - 10F, 10V electrolyticfor better taste and in ex-The hardware predetermined number (password) via the Eleven bidirectional input/output Miscellaneous:act sequence.Fig. 1 shows the block diagram of thekeypad, the relay operates for a limited time (I/O) pinsXtal (Y1)- 4MHz quartz crystalto unlatch the solenoid-operated lock so the 1240 bytes of OTPROM programPZ1 (BZ1)- Ceramic piezo buzzerThis has become pos- vending machine controller. It com-door can be pushed/pulled open. At the endmemoryCon1 - Power-supply connectorsible because of the use ofprises the following sections: powerThe prototype of beverage vending machine controllerof preset delay, the relay de-energises and 64 bytes of user RAMCon2 - 2-pin male/female Bergdeveloped by the author microcontrollers, whichsupply, microcontroller, relays, relayconnectorsthe door gets locked again. If the entered 15-stage multiple-function timerdriver, alphanumericOut of eleven I/O pins, seven lines- 7-pin male/female Bergpassword is correct the unit gives threedisplay, keyboard and small beeps, and if the entered password is have been used for the keyboard, one for connectorsmemory. The power SW1-SW12 - Tactile keyboard switchwrong it