RECOMMENDATIONS

              i.            Hardware

a.       Use another frequency wave which is a wider range so that can be detected in more meters or kilometers. Upgrading to GSM modem which is it can transmit to hand phone. Consequently, it gave more secure for user and increases the security.

b.      Zigbee is another alternative to improve this project because can transmit the signal in wide range up to 1.5 kilometers. Operating Zigbee frequency is 2.4GHz. Besides, it supports network topologies.

            ii.            Power Supply

Battery can be replaced with direct supply because enough supply is very important to ensure circuit work properly while battery works as backup power supply during no electricity.

          iii.            Software

a.       It can simulate using software such as Matlab to get the improvement in keypad input and intruder response by using controller packages such as PID controller, Fuzzy Logic and others. Besides, it will reduce the total hardware complexity and cost at the same time.

b.      The used of internet controlling should be applied to expand the variety of controlling modes. Several software needs to be explored for example HTML and free website. By this, the surveillance can be monitoring anywhere in the world.fore can be executed.

CONCLUSION AND RECOMMENDATION

   CONCLUSION

The goal of this project is to design a door security monitoring system by using micro controller PIC16F877A. The controller will receive input from the user. Then, it will analyze either input is right or wrong. If input true, the input will display on the LCD. If wrong, the transmitter will activate to send the signal to the receiver. Upon receiving the signal, the microcontroller in the receiver will activate the buzzer and sent data to max 232. Lastly, it will display on a PC.

COMPLETE CIRCUIT

FRONT VIEW

UPPER VIEW

HARDWARE

  KEYPAD INPUT RESULT

For the keypad, encoder keypad is being used to encode 8 data from the keypad (4 bits data row and 4 bits data columns). A Data Available output goes high when a valid keypad entry has been made. The Data Available output returns to a low level when the key entered is released, even if another key is depressed

OUTPUT VOLTAGE OF KEYPAD 

TRANSMITTER

TRANSMITTER TRANSMITTING THE SIGNAL

The transmitter goes high when transmitting the signal to the receiver. The transmitter will able to transmit the signal when it has enough voltage

    RECEIVER

RECEIVER RECEIVES THE SIGNAL

Receiver also active high when receives the signal. Figure 24 shown that value of voltage is 1.69 volts. Therefore, receiver fast detected the signal from the transmitter. Low supply voltage from input power causes lagging in receiving the signal.

SCHEMATIC DIAGRAM AND PCB LAYOUT FOR RECEIVER

EXPERIMENTAL RESULT

TRANSMITTER SENDING THE DATA

RECEIVER RECEIVE THE DATA

From the figure it shows that transmitter and receiver can send signal and receive the signal up to 4 bits. In figure 18 the transmitter send signal 3 bits (b) and receiver in figure 19 receive the bits same as transmitter sent signal. While waveform in ‘a’ its reserve for address (8 bits). When address transmitter 00000000 bits, address receiver also must 00000000 bits.  

RESULT AND ANALYSIS

EXPERIMENTAL ANALYSIS

Relationship of voltage supply and resistor (frequency encoder and decoder)

Supply voltage	(KHz)	Value Resistor (Ω)	Supply voltage	(KHz)	Value Resistor (Ω)
2	3.5	510 K	5	175	43 K
4	4	680 K	5	200	36 K
6	4	750 K	5	200	36 K
8	4.125	750 K	5	206.25	33 K
10	5	620 K	5	250	27 K
12	1.625	2 M	5	81.5	100 K

RS 232 SERIAL COMMUNICATION

SCI is an abbreviation for Serial Communication Interface and, as a special subsystem of microcontroller PIC16F877A. It provides RS232 serial communication with PC easily. As with hardware communication, use standard NRZ (Non Return to Zero) format also known as 8 (9)-N-1, or 8 or 9 data bits, without parity bit and with one stop bit. Free line is defined as the status of logic one. Start of transmission - Start Bit, has the status of logic zero. The data bits follow the start bit (the first bit is the low significant bit), and after the bits we place the Stop Bit of logic one. The duration of the stop bit 'T' depends on the transmission rate and is adjusted according to the needs of the transmission. For the transmission speed of 9600 baud, T is 104μs.

In order to connect a microcontroller to a serial port on a computer, need to adjust the level of the signals so communicating can take place. The signal level on a PC is -10V for logic zero, and +10V for logic one. Since the signal level on the microcontroller is +5V for logic one and 0V for logic zero, we need an intermediary stage that will convert the levels. One chip specially designed for this task is MAX232. This chip receives signals from -10 to +10V and converts them into 0 and 5V. The circuit for this interface is shown in the.