Mobile Phone Keypad Sensed Password Entry For Door Opening

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Mobile phone keypad sensed password entry for
door opening
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Introduction

• The main objective of this project is to unlock
  the door using cell phone.
• A unique password must be entered through the
  keypad of cell phone to unlock the door.
• Each key of the password is identified with a
  frequency which is decoded to digital code
  through DTMF (digital tone multi frequency)
  decoder and that code is fed to a microcontroller
  which is programmed to recognize the code for
  operating the door duly interfaced through motor
  driver and finally the password is checked
  whether it is correct or not.

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Block Diagram

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Working of this Project

• The mobile is connected to the DTMF decoder IC
  and a call is made to data mobile from another
  mobile.
• When the network path is formed, any mobile key
  is pressed.
• If 1 is pressed then this tone is decoded to 4
  digit data and given to MC by inverting the data.
  
• MC compares this data and at output port which is
  connected to ULN gets logic high and the output
  of ULN is low which makes the relay ON. Hence,
  load 1 will be ON.

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Hardware requirements

• POWER SUPPLY
• MICROCONTROLLER 8052
• Dual Tone Multi Frequency
• MOTOR DRIVER IC

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Power supply
Bridge rectifier
230 V AC 50 Hz
5v Regulator

5V DC
Filter(470µf)
12V step down transformer
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Dual Tone Multi Frequency

• HT9170 is the series of Dual Tone Multi Frequency
  (DTMF) receivers. They employ digital counting
  techniques to detect and decode the 16 DTMF tones
  into 4 bit output code.
• HT9170 series receivers do not require any
  external filters as they use highly accurate
  switched capacitor filters for filtering low and
  high frequency signals from the DTMF tones. They
  also support power down (PWDN) and inhibit (INH)
  modes. PWDN mode is used to power off the
  crystal, while INH mode to inhibit the A, B, C
  D DTMF tones. The clock is provided by a 3.58 MHz
  crystal.
• In simple terms, HT9170 IC detects and decodes
  the 16 DTMF tones into 4 bit output. In case the
  tones are not detected, the four output bits
  remain low. The DV pin goes high on detection of
  a valid tone.

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DTMF Diagram

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Micro controller

• 8K Bytes of In-System Programmable (ISP) Flash
  Memory.
• 4.0V to 5.5V Operating Range.
• Crystal Frequency 11.0592MHZ.
• Three-level Program Memory Lock.
• 256 x 8-bit Internal RAM.
• 32 Programmable I/O Lines.
• Three 16-bit Timer/Counters.

AT89S52
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Block diagram of MC

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MC components explanation

• ROM
• A code of 4K memory is incorporated as on-chip
  ROM in 8051.
• RAM
• The 8051 microcontroller is composed of 128 bytes
  of internal RAM.
• Interrupt Control
• An event which is used to suspend or halt the
  normal program execution for a temporary period
  of time in order to serve the request of another
  program or hardware device is called an
  interrupt.

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MC components explanation
Parallel Input/Output Ports PORT P0 When there
is no external memory present, this port acts as
a general purpose input/output port. PORT P1
This port is used for various interfacing
activities. PORT P2 This port can be used as a
general purpose port when there is no external
memory but when external memory is present it
works in conjunction with PORT PO as an address
bus. PORT P3 PORT P3 behaves as a dedicated
I/O port.

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MC components explanation

• Address Bus
• A bus is group of wires using which data transfer
  takes place from one location to another within a
  system.
• Timers and Counters
• Synchronization among internal operations can be
  achieved with the help of clock circuits which
  are responsible for generating clock pulses.
• Internal operations can be synchronized using
  clock circuits which produce clock pulses.

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Pin diagram of 8052

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8052 pin diagram explanation

• Port 0(p0.0 to p0.7)
• It is 8-bit bi-directional I/O port. It is bit/
  byte addressable. During external memory access,
  it functions as multiplexed data and low-order
  address bus AD0-AD7.
• Port 1 (p1.0 to p1.7)
• It is 8-bit bi-directional I/O port. When logic
  '1' is written into port latch then it works as
  input mode. It functions as simply I/O port and
  it does not have any alternative function.

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8052 pin diagram explanation

• Port 2 (p2.0 to p2.7)
• It is 8-bit bi-directional I/O port. It is bit/
  byte addressable.
• Port 3(p3.0 to port 3.7)
• It is 8-bit I/O port. In an alternating function
  each pins can be used as a special function I/O
  pin.
• RESET 
• It is active high I/P signal. It should be
  maintained high for at least two machine cycle
  while oscillator is running then 8051
  microcontroller resets.

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Motor driver IC

• L293D is a dual H-bridge 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.
• L293D contains two inbuilt H-bridge driver
  circuits. In its common mode of operation, two DC
  motors can be driven simultaneously, both in
  forward and reverse direction.

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Motor driver ic diagram

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Operation of motor driver

• L293D has 2 set of arrangements where one set has
  input 1, input 2, output 1 and output 2 and
  other set has input 3, input 4, output 3 and
  output 4, according to block diagram if pin no 2
  7 are high then pin no 3 6 are also high.
• If enable 1 and pin number 2 are high leaving
  pin number 7 as low then the motor rotates in
  forward direction.
• If enable 2 and pin number 10 are high leaving
  pin number 15 as low then the motor rotates in
  forward direction.

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Operation of motor driver

• If enable 1 and pin number 2 are low leaving pin
  number 7 as high then the motor rotates in
  reverse direction.
• If enable 2 and pin number 15 are high leaving
  pin number 10 as low then the motor rotates in
  forward direction.

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Operational diagram

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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.

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Applications

• This project can be applicable in offices, banks
  and also at home.
• It will provide keyless entry to the users.
• Frequent carrying of keys is not required for the
  users.
• User friendly digital code lock.
•  

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Conclusion

• This PPT presentation describes about the project
  Mobile Phone Keypad Sensed Password Entry for
  Door Opening, a safety technique to unlock the
  door using cell phone.
• The goal of this work is to design and implement
  a high technology security to access proper door
  system using mobile phones at ease.

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