GSM modem LCD display Microcontroller AT89S MAX Software requirements Embedded C Keil software AT commands The Engineering model System Model Use case diagram Functional decomposition Data flow diagram State Transition diagram Architecture of the system Microcontroller — Modem interfacing RS Microcontroller — LCD interfacing Implementation at institute level Serial transfer using T1 and R1 flags Validity, check and display Future improvements Project Overview The GSM based e-notice board also called Campus Display System CDS is aimed at the colleges and universities for displaying day-to-day information continuously or at regular intervals during the working hours.
Being GSM-based system, it offers flexibility to display flash news or announcements faster than the programmable system. GSM-based campus display system can also be used at other public places like schools, hospitals, railway stations, gardens etc. The CDS mainly consists of a GSM receiver and a display toolkit which can be programmed from an authorized mobile phone. It can serve as an electronic notice board and display the important notices instantaneously thus avoiding the latency.
Being wireless, the GSM based CDS is easy to expand and allows the user to add more display units at any time and at any location in the campus depending on the requirement of the institute. Information Transfer A coordinated sequence of user and telecommunication system actions that causes information present at a source user to become present at a destination user.
An information-transfer transaction usually consists of three consecutive phases called the access phase, the information-transfer phase, and the disengagement phase. Broadcast A term to describe communication where a piece of information is sent or transmitted from one point to all other points.
There is just one sender, but the information is simultaneously sent to all connected receivers. In networking, a distinction is made between broadcasting and multicasting. Broadcasting sends a message to everyone on the network whereas multicasting sends a message to a select list of recipients.
One of the most common examples is broadcast through a cellular network service. This serves multiple end users at different locations in a simulcast fashion.
Practically every cellular system has some kind of broadcast mechanism. This can be used directly for distributing information to multiple mobiles, commonly, for example in a mobile telephony system, the most important use of broadcast information is to set up channels for one to one communication between the mobile Trans-receiver and the base station. This is called paging. The details of the process of paging vary somewhat from network to network, but normally we know a limited number of cells where the phone is located this group of cells is called a location area in the GSM system.
Paging takes place by sending the broadcast message on all of those cells. This project aims at integrating the expansiveness of a wireless cellular network and the ease of information transfer through the SMS with the coverage of campus display boards. It can also be a modest effort to realize the complete potential of public display boards in instantaneous information broadcast in swift response to events of interests.
Components Overview This system uses the following components. It is 20 character x 2 line display module. A wireless modem behaves like a dial-up modem. The main difference between them is that a dial-up modem sends and receives data through a fixed telephone line while a wireless modem sends and receives data through radio waves. In this project, we must take into account the fact that the modem requires a wired connection at one end and wireless at the other.
It is a compact and portable terminal that can satisfy various data communication needs over GSM. It can be connected to a computer with the help of a standard RSC serial port. The Simado GDT11 is easy to set up.
Computers use AT commands to control modems. GSM modem can be used just like a dialup modem. This interface is used to setup the GSM modem. These receivers have a typical threshold of 1. System operation The operation of the system is very simple.
Sending message from any of the remote area to the distant located e-notice board using GSM mobile. For sending the text message from remote area we need to interface the mobile phone with GSM Modem. Moreover GSM based applications could be easily developed and enhanced due to easily accessibility of components in local markets at very pocket friendly prices. Nowadays many people are showing lot of interest to know more about GSM related concepts.
So, here we have surveyed a list of various GSM based projects ideas which are having more demand and very interesting to learn. The following projects based on GSM technology we surveyed would give better idea about the GSM technology practically. We want to control everything and without moving an inch. This remote of appliances is possible through Embedded Systems. The main aim of this project will be to design a SMS driven automatic display toolkit which can replace the currently used programmable electronic display.
It is proposed to design receive cum display toolkit which can be programmed from an authorized mobile phone. The message to be displayed is sent through an SMS from an authorized transmitter. This project is designed to monitor various parameters like humidity, rainfall, wind direction, temperature, light intensity, etc.
This system saves time and money by eliminating the need for service personnel to visit each site for inspection and data collection. They are used in all types of industries, from electrical distribution systems, to food processing, to facility security alarms. Most of our tertiary students carry mobile phones with SMS facilities and can be used for teaching and learning.
There are many projects using SMS technologies in education as outlined in the literature survey, but many publications do not provide the possible underlying technologies to implement such as the teaching and learning systems. The system is capable of supporting administrative teaching and learning activities via the SMS technology. AMR system gives the information of meter reading, power cut, total load used, power disconnect and tempering on request or regularly in particular interval through SMS.
The information is being sent and received by concerned energy Provider Company with the help of GSM network. Energy provider receives the meter reading within a second without visiting person AMR minimize the number of traditional visits required by employs of energy Provider Company. This system not only reduces the labor cost but also increase meter reading accuracy and save huge amount of time. The proposed system automatically reads the energy consumed and sends it to the service provider using the existing SMS.
In the age of electronic systems it is important to be able to control and acquire information from everywhere. Remote management of several home and office appliances is a subject of growing interest and in recent years we have seen many systems providing such controls. Fig 3. But we must take into account the fact that the MODEM requires a wired connection at one end and wireless at the other.
Dedicating a general purpose computer at each and every site of the display boards, although makes the task a lot easier but is too expensive to be a possibility. The design procedure involves identifying and assembling all the required hardware and ensuring fail safe interfacing between all the components. The number of valid mobile numbers can be more than one.
The limiting constraint is the RAM of the microcontroller rather than the coding-complexities. Advantage of using this modem will be that you can use its RS port to communicate and develop embedded applications.
Applications like SMS Control, data transfer, remote control and logging can be developed easily. The modem can either be connected to PC serial port directly or to any microcontroller.
It can also be used in GPRS mode to connect to internet and do many applications for data logging and control. GSM modem can be used just like a dial-up modem. Fig 4. Some of the most common LCDs connected to the are 16x2 and 20x2 displays. This means 16 characters per line by 2 lines and 20 characters per line by 2 lines, respectively. This is due to the following reasons: 1.
Declining prices 2. Ability to display numbers, characters and graphics. Incorporation of a refreshing controller into the LCD. Ease of programming. The standard is referred to as HDU, which refers to the controller chip which receives data from an external source in this case, the and communicates directly with the LCD. The user may select whether the LCD is to operate with a 4-bit data bus or an 8-bit data bus.
If a 4-bit data bus is used the LCD will require a total of 7 data lines 3 control lines plus the 4 lines for the data bus. This is a cheaper solution than a two-way GPS communication system wherein communication is done in both ways with GPS satellites.
GSM modem with a SIM card used here implements the same communication technique as in a regular cellphone. The system can be mounted or fitted in your vehicle in a hidden or suitable compartment. After this installation, you can easily track your vehicle using your mobile phone by dialling the mobile number of the SIM attached to the GSM modem. You will automatically get the location of the vehicle in the form of an SMS short message on your mobile phone.
In the Vehicle tracking project, you can track the location of your Vehicle. Also, if you have Google Map installed on your smartphone then you can get the exact location of the vehicle on Google map. User needs to click on the URL in the SMS, then the smartphone will open the link in Google map and will show a red marker location on the map. This red marker represents the location of the Vehicle.
This design continuously records or logs the fuel consumption and fuel filling in the memory. Also, it facilitates the user or owner to send different commands from mobile to the GSM module in order to get the information of fuel log and also for knowing the exact location of the vehicle. This information is passed to the nearby police station through GSM modem. Upon this collected information from various UPS section, we can easily find out the fault. The control signals from user mobile corresponding key on dial pad received by GSM module along with DTMF decoder helps to control the direction of four legged robot.
This robot can be used for surveillance and land mine detection application on rocky terrains. This design deal with automatic message sending and receiving technique to send the current speed of the motor to remote mobile and to accept the user SMS to control the speed.
In this, PWM technique is implemented to control the speed of the motor. Automated System for Air Pollution Detection and Control in Vehicles : The objective of this project is to implement a small embedded unit for automobiles that can detect the pollution or emission of pollutants in the vehicle and thereby take control over vehicle engine.
This design continuously monitors the pollution caused by the vehicle, if the pollution level is violated; it immediately turns off the vehicle engine and also informs the owner via GSM. This system uses a cryptography technique to provide the security to the audio data transfer within GSM networks. The results obtained after decryption is the exact copy of original file. This design allows the user to open or close the door via SMS through GSM modem and also informs the owner in case of any person trying to access the door via keypad attached to it even for correct or wrong password.
GPS and GSM modules on this system send the exact location of cracks on the track to remote authorized mobiles. Various weather parameters like temperature, humidity, gas, etc are acquired and send to the remote mobile via GSM mobile so that user could able to control appliances like fans, water sprinklers, alarm devices, etc remotely.
The specified water levels detected by the circuit is send to the remote mobile via GSM modem so that user aware the level information. This project is useful for the industries for remote monitoring of liquids in large tanks. GSM module attached to this system allows the user for advance booking of slot in parking area. A wrist watch type device with one button sends the exact location to the SOS contacts or police station in the emergency conditions.
GPS module determines the exact location while GSM module sends that location data to predefined user telephone numbers. GSM based Distribution Transformer Monitoring System : In this project, remote monitoring of transformer parameters such as oil level, load current and ambient temperature, etc is performed by using GSM technology.
The microcontroller unit along with GSM modem sends the transformer parameters data to remote mobile so that user can monitor any abnormality of transformer from far remote locations. Various sensor data collected by microcontroller unit in crop fields is transferred to the field GSM transceiver and then send to remote GSM transceiver.
This can be useful in public places, hospitals, banks, etc to update the information every time through mobile. The GSM modem attached to the hardware receives the messages from remote mobile and then translates not only into voice using loudspeaker but also into Braille language. This also facilitates to send the messages to remote mobile by typing letter upon Braille pad attached to this hardware. C Control System for Vehicles : This project implements a system which automatically controls the vehicle ignition system as well as air conditioning system whenever user sends a message to the control unit from mobile.
This increases flexibility and facilitates to turn AC earlier as compared with conventional turning ON process of Air conditioning. Whenever station master sends the SMS from his mobile to the controlling unit located at level crossing, GSM modem receives the message and then transfers it to the microcontroller which further drives the motor. Whenever fault takes place in transmission and distribution lines such as falling of live conductor on ground, this system automatically stops the power supply as well as generates the SMS and conveys it to the electricity department.
The location information will be sent to the GSM module so that it can be conveyed to remote person in order to track the blind people. This system also provides obstacle detection on the path. This system uses automatic meter reading equipment and GSM module along with tactile sensor to address the power theft problem.
When this system detects the theft of power, it automatically generates the SMS and sends it to the electricity department. RFID reader collects the attendance and transmits it into the microcontroller. Further this data is logged to the central computer and also sends the message to the parents via GSM module. This wireless vending machine based on USSD is given an in depth introduction. It provides more security to the bank locker. This project shows the efficient using of resources and monitoring of the field.
GSM is used to send an sms about the condition of the field to the user.
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