Design And Implementation

3.1 Introduction

          The project work is a delicate one to design in board as lots of Fragile device needs to be soldered and fixed to make it operational, But initial presumption is made totally on the modeling aspect of the project in terms of components to be used in our research work, The paragraph below will give an idea about the various components deployed in our project work.

3.2 Components Deployed

            The various components deployed for the development of the model are provided in the following list.

Components	Quantity	Cost  per component	Total cost
TLP RLP  pair  (Transmitter and Receiver)	1	600	600
AT89c2051	1	70	70
AT89c51 IC	1	70	70
HT12E  IC	1	50	50
HT12D  IC	1	50	50
MAX232  IC	1	25	25
DB9 Connector	1	10	10
11.0592Mhz crystal	1	12	12
ULN2003  IC	2	10	20
Relays	8	25	200
Stepper Motor	2	250	500
Switch mode power supply	1	500	500
Discreet Register	15	1	15
Web Camera	1	700	700
Laser Pointer	4	20	80
Discreet Capacitors	10	8	80
Total			2982

                                                  

Table 3.1: List of Component

            Above table shows the list of components with their cost and quantity which are deployed in the project unmanned gun control mechanism, In this project we use AT89c51 microcontroller which contains Non-volatile FLASH program memory that is parallel programmable.

PCB’s	Quantity	Design charges	Film making charge	PCB making charge
40 pin  µc  PCB	1	900	250	50
Relay PCB	2	650	150	20
20 pin µc PCB	1	700	150	30
Total			550	100

Table 3.2: PCB Design & layout list

                                                                                                                                                                                      

3.3 Block Diagram

Fig 3.3 (a):- Block diagram of receiver.

Fig 3.3(b): Remote control to Disable/Enable the gun

Above figure shows the block diagram of unmanned gun control mechanism. In this project :-

v  A mechanism which will employ image processing in which a camera (Webcam) will be continuously observing the "area under surveillance".

v  This data will be then processed by a MATLAB code which will be running on a pc and will be able to detect a particular color (say Red) in front of a white background (depicting snow).

v  Depending on this processed data the information about the intruder location will be sent to a microcontroller (8051) via the serial/parallel port of the pc and then a motor controlled gun will be used to point in the direction of the intruder.

v  The mechanism will be online i.e the Gun will continuously be pointing in the direction of the intruder, further depending on range (Distance from the Gun) the Gun can be activated and a laser pointer will be switched ON to depict "Shooting the target".

v  Another feature of remote controlling will be incorporated to disable the device from a distance lest .it might start shooting the people from the same country.

v  For this we will be using a wireless control employing TLP/RLP 434 devices whose     wireless range can be extended up to 250Fts. further to take care of certain condition when the enemy also visits the post in white dress and the device might fail to detect him .we propose a laser sensors deployment along the periphery which will be able to identify. In case any thing has been present in front of it for a certain amount of time.

3.4 Circuit Diagram                                                                             

3.4.1 Circuit diagram of Gun Pointer Transmitter

Figure 3.4.1: Circuit diagram of Gun Pointer Transmitter

Above block diagram shows the Transmitter of the gun pointer which are used for the purpose of enable & disable the gun. Transmitter are connected with the HT12E encoder which takes the image from webcam and segmented into 16 quadrants. Transmitter are driven by 5v dc voltage.

3.4.2 Circuit Diagram Gun Pointer Receiver

Figure 3.4.2: Circuit Diagram of Gun Pointer Receiver

Circuit diagram of receiver is used MAX232 IC and DB9 connector which convert the input into serial port. HT12D decoder are used by the receiver for modulate the ASK signal which are received from the TLP transmitter. RLP is driven by the 5v dc voltage.

3.4.3 Circuit Diagram of Stepper Motor

Figure 3.4.3: Circuit Diagram of Stepper Motor.

Circuit diagram of stepper motor is shown in the fig 3.4.3. In the above diagram Stepper motor is directly connected to the Pin 13,14,15 and 16 of ULN2003. Which is monolithic high voltage and high current Darlington transistor arrays. It consist of seven NPN Darlington pairs that features high voltage outputs with common cathode clamp diode for switching inductive loads. The motor has full torque at standstill (if winding are energize).

3.4.4 Design of the system

The design is mainly related to robot  type ,the transmitter which we are using in this circuit is HT12E (encoder),which is 18 pin IC ,which works on +/- 12V,the address lines (AD0-AD3) connected in series with the microcontroller (P3.3-P3.6) respectively, which intern connected to switches and 17th pin of HT12E is connected in series with the transmitter line pulse (TLP), its function is to send the ASK modulated signals to the receiver (RLP).

ASK  modulated signals from TLP is received from the RLP and its digital output is sent to the HT12D, which is 18 pin IC, which works at +/- 12V, the address lines  (D0-D3) is connected in series to the micro controller (P3.3-P3.6) which intern connected to high voltage and high current darling ton transistor array ULN, from pins(P0.0-P0.7) its function is to drive the relay from 5V to 12V,which is connected to the stepper motor.

The microcontroller controls the stepper motor rotation and laser pointer direction depending upon the serial data from the PC, here MAX232 IC is been used for the TTL logic level compatibility.