Remote computer management system is a system that provides remote access to the network and the system. Consider designing with two applications. The first module being a GPRS Server, where the user can interact with system. The user will type the command in cell phone, and send it to server via GPRS, computer based online server will receive the command, and execute the command on MS-DOS for example ipconfig, ifconfig or ping etc. The second module is GSM Server, in which user can interact with system via sms, the user will type the command in cell phone, and send it to server via GSM, computer based GSM server will receive the command, and execute the command on MS-DOS for example ipconfig, ifconfig or ping etc.
It only requires the user to login through cell phone and manage the system. The remote computer management system includes a J2ME based client side application in cell phone to type MS-DOS / Bash commands and display the results. The client has the capability to interact with Linux and Windows based server applications. A Server Application to receive client requests, the user can interact with Command Prompt in Windows and bash terminal in Linux. Client/Server application can communicate either using GSM Modem or GPRS. Remote computer management system is developed using API’s of J2SE, J2EE and J2ME to provide independent platform, MySql database is used for maintaining the records and file handling for maintaining log information.
Tuesday, November 29, 2011
Sunday, November 20, 2011
Prepaid Energy Meter
A scheme of Electricity billing system called "PREPAID ENERGY METER WITH TARIFF INDICATOR" can facilitate in improved cash flow management in energy utilities and can reduces problem associated with billing consumer living in isolated area and reduces deployment of manpower for taking meter readings.
Consumers need to buy memory cards with a password stored inside it using a MC program. Memory cards are available at various ranges (ie. Rs 50, Rs 100, Rs 200 etc). When the consumer insert a smart card into the card reader which is connected kit.Then the card reader will read the stored information and delete the information from the EEPROM IC(smart card) using the MC program. So that the smart card cannot be reused by others. According to the power consumption the amount will be reduced.
Consumers need to buy memory cards with a password stored inside it using a MC program. Memory cards are available at various ranges (ie. Rs 50, Rs 100, Rs 200 etc). When the consumer insert a smart card into the card reader which is connected kit.Then the card reader will read the stored information and delete the information from the EEPROM IC(smart card) using the MC program. So that the smart card cannot be reused by others. According to the power consumption the amount will be reduced.
Sunday, November 6, 2011
Auction Site
Over the past decade, sites like eBay and Amazon have used auction website design to turn the phenomenon of online auctions into a viable business model. In their wake, companies in every industry and of every size have been able to employ similar strategies on their own sites to create additional revenue streams.
Launching an online auction website, however, is not something that happens overnight. The complexity of the project is exactly the reason you need a digital marketing firm with internet professionals experienced in crafting auction sites.
An online auction requires an intense amount of time and planning as well as capital investment to be successful. From crafting a design that is easy to use, to programming backend functions to handle bids and purchases, a well executed auction site requires a high level of skill to deliver results.
Launching an online auction website, however, is not something that happens overnight. The complexity of the project is exactly the reason you need a digital marketing firm with internet professionals experienced in crafting auction sites.
An online auction requires an intense amount of time and planning as well as capital investment to be successful. From crafting a design that is easy to use, to programming backend functions to handle bids and purchases, a well executed auction site requires a high level of skill to deliver results.
Monday, July 26, 2010
Access Control System
An Access Control System would contain two parts- the client side and the server side. The client side would contain a keypad, LCD display, door opening unit, monostable multivibrator, microcontroller, DTMF encoder and a DTMF decoder. The client side would contain a DTMF encoder, DTMF decoder and a microcontroller that is connected to the computer
Automatic Traffic Control System
Automotive technologies are gaining ground in road traffic-control systems today. There is a need for safety-critical traffic automation, and traffic engineering makes the dynamic or static analysis and the synthesis of automotive vehicle technologies possible. The goal of engineering is the planning and management of traffic systems.
The intelligent and cooperative set-up of actuation and its linkage to the central control system is vital for avoiding traffic jams and accidents. Moreover, environmental costs (eg pollution) can be decreased.
The design of the traffic control system can be evaluated in two steps – synthesis and analysis. Several models and multiple control strategies exist, and engineers must decide between them using a priori knowledge of the real system. Previously collected information can help to choose the appropriate model, parameters, measurement and control methodologies to create the optimal solution.
The intelligent and cooperative set-up of actuation and its linkage to the central control system is vital for avoiding traffic jams and accidents. Moreover, environmental costs (eg pollution) can be decreased.
The design of the traffic control system can be evaluated in two steps – synthesis and analysis. Several models and multiple control strategies exist, and engineers must decide between them using a priori knowledge of the real system. Previously collected information can help to choose the appropriate model, parameters, measurement and control methodologies to create the optimal solution.
Wednesday, July 21, 2010
Difference b/w microprocessor and microcontroller
The microprocessor is meant to perform as a CPU in a microcomputer system. Microprocessor will have no RAM, ROM or I/O ports in it. It has to be configured with other chips to produce a microcomputer systems. The microprocessor instruction set is arranged to allow instruction code and large amount of data to be moved between microprocessor and external memory using working registers, address pointers etc.
Microcontroller on the other hand is designed to operate with minimal external circuitry using a control program in ROM. The instruction set is simpler in a microcontroller compared to that in microprocessor as instruction are needed to move code and data between internal memory and ALU.
Microcontroller on the other hand is designed to operate with minimal external circuitry using a control program in ROM. The instruction set is simpler in a microcontroller compared to that in microprocessor as instruction are needed to move code and data between internal memory and ALU.
Sunday, July 18, 2010
LCD Interface
This is the first interfacing example for the Parallel Port. We will start with something simple. This example doesn't use the Bi-directional feature found on newer ports, thus it should work with most, if no all Parallel Ports. It however doesn't show the use of the Status Port as an input. So what are we interfacing? A 16 Character x 2 Line LCD Module to the Parallel Port. These LCD Modules are very common these days, and are quite simple to work with, as all the logic required to run them is on board.
Schematic
Circuit Description
Above is the quite simple schematic. The LCD panel's Enable and Register Select is connected to the Control Port. The Control Port is an open collector / open drain output. While most Parallel Ports have internal pull-up resistors, there are a few which don't. Therefore by incorporating the two 10K external pull up resistors, the circuit is more portable for a wider range of computers, some of which may have no internal pull up resistors.
We make no effort to place the Data bus into reverse direction. Therefore we hard wire the R/W line of the LCD panel, into write mode. This will cause no bus conflicts on the data lines. As a result we cannot read back the LCD's internal Busy Flag which tells us if the LCD has accepted and finished processing the last instruction. This problem is overcome by inserting known delays into our program.
The 10k Potentiometer controls the contrast of the LCD panel. Nothing fancy here. As with all the examples, I've left the power supply out. You can use a bench power supply set to 5v or use a onboard +5 regulator. Remember a few de-coupling capacitors, especially if you have trouble with the circuit working properly.
The 2 line x 16 character LCD modules are available from a wide range of manufacturers and should all be compatible with the HD44780. The one I used to test this circuit was a Powertip PC-1602F and an old Philips LTN211F-10 which was extracted from a Poker Machine! The diagram to the right, shows the pin numbers for these devices. When viewed from the front, the left pin is pin 14 and the right pin is pin 1.
Programming - Source Code
/* LCD Module Software */
/* 17th May 1997 */
/* Copyright 1997 Craig Peacock */
/* WWW - http://www.senet.com.au/~cpeacock */
/* Email - cpeacock@senet.com.au */
/* */
/* Register Select must be connected to Select Printer (PIN 17) */
/* Enable must be connected to Strobe (PIN1) */
/* DATA 0:7 Connected to DATA 0:7 */
#include
#include
#define PORTADDRESS 0x378 /* Enter Your Port Address Here */
#define DATA PORTADDRESS+0
#define STATUS PORTADDRESS+1
#define CONTROL PORTADDRESS+2
void main(void)
{
char string[] = {"Testing 1,2,3 "
"It' Works ! "};
char init[10];
int count;
int len;
init[0] = 0x0F; /* Init Display */
init[1] = 0x01; /* Clear Display */
init[2] = 0x38; /* Dual Line / 8 Bits */
outportb(CONTROL, inportb(CONTROL) & 0xDF); /* Reset Control Port - Make sure Forward Direction */
outportb(CONTROL, inportb(CONTROL) | 0x08); /* Set Select Printer (Register Select) */
for (count = 0; count <= 2; count++)
{
outportb(DATA, init[count]);
outportb(CONTROL,inportb(CONTROL) | 0x01); /* Set Strobe (Enable)*/
delay(20); /* Larger Delay for INIT */
outportb(CONTROL,inportb(CONTROL) & 0xFE); /* Reset Strobe (Enable)*/
delay(20); /* Larger Delay for INIT */
}
outportb(CONTROL, inportb(CONTROL) & 0xF7); /* Reset Select Printer (Register Select) */
len = strlen(string);
for (count = 0; count < len; count++)
{
outportb(DATA, string[count]);
outportb(CONTROL,inportb(CONTROL) | 0x01); /* Set Strobe */
delay(2);
outportb(CONTROL,inportb(CONTROL) & 0xFE); /* Reset Strobe */
delay(2);
}
}
Above is the source code to get this example running. It's been written for Borland C, so if you are using a Microsoft compiler, then you will have to change the outportb() function to outp() and inportb() to inp().
The LCD panel requires a few instructions to be sent, to order to turn on the display and initialise it. This is what the first for loop does. These instructions must be sent to the LCD's Instruction Register which is controlled by the Register Select (Pin 4). When pin 4 is low the instruction register is selected, thus when high the data register must be selected. We connect this to the Parallel Port's Select Printer line which happens to be hardware inverted. Therefore if we write a '1' to bit 3 of the Control Register the Select Printer line goes low.
We want to first send instructions to the LCD module. Therefore the Register Select line must be low. As it is hardware inverted, we will want to set bit 3 of the Control Register to '1'. However we don't want to upset any other bits on the Control Port. We achieve this by reading the Control Port and OR'ing 0x80 to it. e.g. outportb(CONTROL, inportb(CONTROL) | 0x08); This will only set bit 3.
After we place a data byte on the data lines, we must then signal to the LCD module to read the data. This is done using the Enable line. Data is clocked into the LCD module on the high to low transition. The Strobe is hardware inverted, thus by setting bit 0 of the Control Register we get a high to low transition on the Strobe line. We then wait for a delay, and return the line to a high state ready for the next byte.
After we initialize the LCD Module, we want to send text to it. Characters are sent to the LCD's Data Port, thus we want to clear bit 3. Once again we must only change the one bit, thus we use outportb(CONTROL, inportb(CONTROL) & 0xF7);. Then we set up another for loop to read a byte from the string and send it to the LCD panel. This is repeated for the length of the string.
The delays should be suitable for most machines. If the LCD panel is not initializing properly, you can try increasing the delays. Likewise if the panel is skipping characters, e.g. Tst ,2. On the other hand, If the LCD module is repeating characters e.g. TTTeessttiinngg then you may have a faulting Enable connection. Check your Enable to Strobe connection.
Schematic
Circuit Description
Above is the quite simple schematic. The LCD panel's Enable and Register Select is connected to the Control Port. The Control Port is an open collector / open drain output. While most Parallel Ports have internal pull-up resistors, there are a few which don't. Therefore by incorporating the two 10K external pull up resistors, the circuit is more portable for a wider range of computers, some of which may have no internal pull up resistors.
We make no effort to place the Data bus into reverse direction. Therefore we hard wire the R/W line of the LCD panel, into write mode. This will cause no bus conflicts on the data lines. As a result we cannot read back the LCD's internal Busy Flag which tells us if the LCD has accepted and finished processing the last instruction. This problem is overcome by inserting known delays into our program.
The 10k Potentiometer controls the contrast of the LCD panel. Nothing fancy here. As with all the examples, I've left the power supply out. You can use a bench power supply set to 5v or use a onboard +5 regulator. Remember a few de-coupling capacitors, especially if you have trouble with the circuit working properly.
The 2 line x 16 character LCD modules are available from a wide range of manufacturers and should all be compatible with the HD44780. The one I used to test this circuit was a Powertip PC-1602F and an old Philips LTN211F-10 which was extracted from a Poker Machine! The diagram to the right, shows the pin numbers for these devices. When viewed from the front, the left pin is pin 14 and the right pin is pin 1.
Programming - Source Code
/* LCD Module Software */
/* 17th May 1997 */
/* Copyright 1997 Craig Peacock */
/* WWW - http://www.senet.com.au/~cpeacock */
/* Email - cpeacock@senet.com.au */
/* */
/* Register Select must be connected to Select Printer (PIN 17) */
/* Enable must be connected to Strobe (PIN1) */
/* DATA 0:7 Connected to DATA 0:7 */
#include
#include
#define PORTADDRESS 0x378 /* Enter Your Port Address Here */
#define DATA PORTADDRESS+0
#define STATUS PORTADDRESS+1
#define CONTROL PORTADDRESS+2
void main(void)
{
char string[] = {"Testing 1,2,3 "
"It' Works ! "};
char init[10];
int count;
int len;
init[0] = 0x0F; /* Init Display */
init[1] = 0x01; /* Clear Display */
init[2] = 0x38; /* Dual Line / 8 Bits */
outportb(CONTROL, inportb(CONTROL) & 0xDF); /* Reset Control Port - Make sure Forward Direction */
outportb(CONTROL, inportb(CONTROL) | 0x08); /* Set Select Printer (Register Select) */
for (count = 0; count <= 2; count++)
{
outportb(DATA, init[count]);
outportb(CONTROL,inportb(CONTROL) | 0x01); /* Set Strobe (Enable)*/
delay(20); /* Larger Delay for INIT */
outportb(CONTROL,inportb(CONTROL) & 0xFE); /* Reset Strobe (Enable)*/
delay(20); /* Larger Delay for INIT */
}
outportb(CONTROL, inportb(CONTROL) & 0xF7); /* Reset Select Printer (Register Select) */
len = strlen(string);
for (count = 0; count < len; count++)
{
outportb(DATA, string[count]);
outportb(CONTROL,inportb(CONTROL) | 0x01); /* Set Strobe */
delay(2);
outportb(CONTROL,inportb(CONTROL) & 0xFE); /* Reset Strobe */
delay(2);
}
}
Above is the source code to get this example running. It's been written for Borland C, so if you are using a Microsoft compiler, then you will have to change the outportb() function to outp() and inportb() to inp().
The LCD panel requires a few instructions to be sent, to order to turn on the display and initialise it. This is what the first for loop does. These instructions must be sent to the LCD's Instruction Register which is controlled by the Register Select (Pin 4). When pin 4 is low the instruction register is selected, thus when high the data register must be selected. We connect this to the Parallel Port's Select Printer line which happens to be hardware inverted. Therefore if we write a '1' to bit 3 of the Control Register the Select Printer line goes low.
We want to first send instructions to the LCD module. Therefore the Register Select line must be low. As it is hardware inverted, we will want to set bit 3 of the Control Register to '1'. However we don't want to upset any other bits on the Control Port. We achieve this by reading the Control Port and OR'ing 0x80 to it. e.g. outportb(CONTROL, inportb(CONTROL) | 0x08); This will only set bit 3.
After we place a data byte on the data lines, we must then signal to the LCD module to read the data. This is done using the Enable line. Data is clocked into the LCD module on the high to low transition. The Strobe is hardware inverted, thus by setting bit 0 of the Control Register we get a high to low transition on the Strobe line. We then wait for a delay, and return the line to a high state ready for the next byte.
After we initialize the LCD Module, we want to send text to it. Characters are sent to the LCD's Data Port, thus we want to clear bit 3. Once again we must only change the one bit, thus we use outportb(CONTROL, inportb(CONTROL) & 0xF7);. Then we set up another for loop to read a byte from the string and send it to the LCD panel. This is repeated for the length of the string.
The delays should be suitable for most machines. If the LCD panel is not initializing properly, you can try increasing the delays. Likewise if the panel is skipping characters, e.g. Tst ,2. On the other hand, If the LCD module is repeating characters e.g. TTTeessttiinngg then you may have a faulting Enable connection. Check your Enable to Strobe connection.
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