GSM SECURITY SYSTEM
In this project we show that how we use the telephone as a electronics eye. With the help of landline phone we check and examine the position of the house automatically. In this logic we attach some sensor with the telephone and if there is any mis happening then telephone is automatic on and then circuit press the redial button of the telephone and then telephone dial the pre-dialied number and sense the voice message to the received end. All these logic is to be divided into few parts.
Micro controller interface
Switch on the telephone
In this sensor unit it is our choice , how many sensorís we use , IN this project we use two sensorís, In this project we use two electronics circuit with infra red sensorís and fire alarm sensor.
In the infra red sensor. We use ic 555 as a main component. Pin no 4 and pin no 8 is connected to the positive supply. Pin no 1 is connected to the negative voltage. One capacitor is grounded from the pin no 5 for noise cancellation. Output is available on the pin no 3. Sensor is connected to the pin no 2.
In the case of infra red sensor. Pin no 2 is negative bias through the 33k ohm resistor and pin no is positively biased through the photodiode. One infra red transmitter l.e.d is focused to the photodiode . Infra red l.e.d is directly connected to the positive and negative supply through the 470 ohm resistor..
In normal stage when light is focus on the photodiode then pin no 2 is positively biased photodiode. If pin no 2 is positive then negative output is available on the pin no 3. Now when any body interrupt the light then there is no light on the photodiode and pin no 2 is now gets its voltage from only 33 k ohm resistor. If pin no 2 is become negative then output is shifted to the pin no 3. when positive output is available on the pin no 3 and with the help of this voltage NPN transistor is on and npn transistor provide a negative voltage as a pulse to the microcontroller.
If we connect two sensor as a input to the microcontroller then we use same circuit with the ic 555 .
Note that microcontroller sense only negative input to the microcontroller.
ATMEL AT89C2051 Pinout and
The 2051 is a low voltage (2.7V - 6V), high performance CMOS 8-bit microcontroller with 2 Kbytes of Flash programmable and erasable read only memory (PEROM). This device is compatible with the industry standard 8051 instruction set and pinout. The 2051 is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications. The 2051 provides the following features:
~ 2 Kbytes of Flash
In addition, the 2051 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The Power Down Mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset.
2051 - 24MHz DIP Available
The 2051 can be programmed using a device programmer such as the PG302 (Click Here).
have Projects that use the 2051 Microcontroller.
This page last updated on April 7, 2003.
All the input sensor is connected to the pin no 18 and 19. Pin no 18 is connected to the P1.6, and pin no 19 is connected to the P1.7. pin no 20 is connected to the positive supply. Pin no 1 reset pin. One capacitor is connected from positive to pin no 1 and one resistor is grounded from pin no 1. One microswitch is connected across the capacitor fro manual reset switch.
One buzzer is connected to the pin no 16 ( Port p1.4) this buzzer is on when circuit sense a input from the input sensorís. .
Microntroller get input from sensors and then give signal to RF modules
RF modules work at 433 MHz frequencies.
push to on sw
.001 Ķf,0.1 Ķf,0.01Ķf
crystal 11.0592 MHz
speaker 8 ohm
relay 12v 100 ohm
transformaer 6v 500mA
BLOCK DIAGRAM SECURITY SYSTEM
Easy to implement
Components easily available in market.