CELL PHONE BASED DEVICE CONTROL UNDER THE GUIDANCE OF “MS.G.SUSMITHA”Asst.Prof.DEPARTMENT OF ELETRICAL AND ELECTRONICS ENGG. GROUP MEMBERS: A.VISHWANATH (09281A0233) K.BHAVANA (0928A10246) D.SANTHOSH (09281A0209)
OBJECTIVETurning on/off the appliance with our cell phone.Cell phone as the remote control for our home appliances.System also gives voice acknowledgement of the appliances status.
FEATURESWe can control up to 6 devicesThere is no risk for false switching.Before changing the state of the device we can confirm the present status of the device.
INTERFACING OF SWITCHES WITH MICROCONTROLLER TABLE- ISWITCHES MOBILE KEYS FUNCTIONS1 1 Select Device 1:On/OffS2 2 Select Device 2:On/OffS3 3 Select Device 3:On/OffS4 4 Select Device 4:On/OffS5 5 Select Device 5:On/OffS6 6 Select Device 6:On/OffS7 * Initialize to inform the status of the device
CONTROL SOURCE SELECTION USING DIP SWITCHES TABLE-II S17 S18 CONTROL STATUS 0 0 Rest Status 0 1 Switches Only 1 0 Mobile Only 1 1 Switches and Mobile
RECORDING AND PLAYBACK TABLE TABLE III SWITCHES TRIGGER OF IC FUNCTIONS S9 1 NAME OF DEVICE 1 S10 2 NAME OF DEVICE 2 S11 3 NAME OF DEVICE 3 S12 4 NAME OF DEVICE 4 S13 5 NAME OF DEVICE 5 S14 6 NAME OF DEVICE 6 S15 7 STATUS” ON” S16 8 STATUS” OFF”
INTRODUCTION TO MICROCONTROLLER A single chip that contains: a)Processor(CPU) b)Non volatile memory(ROM) c)Volatile memory(RAM) d)ClockCPU RAM ROM e)I/O controlling unitI/O TIMER SERIAL COM PORT
INTERFACING DRIVER USING IC-L293DL293D is a dual motor driver integrated circuit (IC). Motor drivers act as current amplifiers since they take a low-current control signal and provide a higher- current signal. This higher current signal is used to drive the motors.In its common mode of operation, two DC motors can be driven simultaneously, both in forward and reverse direction. The motor operations of two motors can be controlled by input logic at pins 2 & 7 and 10 & 15. Input logic 00 or 11 will stop the corresponding motor. Logic 01 and 10 will rotate it in clockwise and anticlockwise directions, respectively.
DTMF DECODING USING IC-HT9170B.Decodes the mobile signal.It gets DTMF tone from the mobile headset’s speaker pins.
DECODING TABLE TABLE IVKEY STD Q3 Q2 Q1 Q01 H 0 0 0 12 H 0 0 1 03 H 0 0 1 14 H 0 1 0 05 H 0 1 0 16 H 0 1 1 0* H 1 0 1 1# H 1 1 0 0
Comparison between 8051 and Atmel• 8051 and 89c51 are same architecture but difference is ROM memory .• ROM less for 8051 while ROM (flash) for 89c51.• it advanced EEPROM (flash) is difference.• it becomes possible for the 8051 designer to directly start using 89SXX and 89S20XX microcontrollers without any more efforts in learning these microcontrollers.
ADVANTAGES OF THE PROJECTUtilization Of Electrical power.Power Conservation.Design is small and portable.Easy to use.Economical.
LIMITATIONSThe receiver must reside where sufficient signal can be received from a cellular phone network.The receiver must have a power source attached at all times. Only 6 devices can be connected to the system.
SOFTWAREThe program (Device_Control.BAS) for the microcontroller is written using BASCOM microcontroller programming software.In the program, first, initialize the ports (P0-P3) for corresponding controls. Thereafter, declare the variables for the program. After declaration, assign some initial value to variables. Here, microcontroller ports are initialized to make all the devices ‘off’ initially .
FUTURE SCOPEIn this project we are monitoring and controlling the home appliances from remote places by using the mobile technology. This project can be further enhanced to the High voltage A.C Applications by changing the ratings of the Relay.By this we can control and monitoring the high speed induction motors as well as synchronous motors. This can be done in an economical way
CONCLUSION• The project “Development of Cell-phone Based Device Control " an effective switching system for controlling home and office appliances.”
BIBLIOGRAPHYReference Books:1)Electronic Devices & circuits by J.B.GUPTA.2)The 8051 Microcontroller And Embedded Systems by M.A.MAZIDI3)Electronics For You Magazine.Reference Websites:1) www.engineersgarage.com2)www.efy.com3)www.electronicsforu.com