DEVICE OVERVIEW

MAX232 IC

MAX232 is an integrated circuit that converts signals from RS-232 serial port. The MAX232 is a dual driver/receiver and typically converts the RX, TX, signals. The drivers provide RS-232 voltage level outputs from a single 5V supply via on-chip charge pumps and external (typically 100 nF) capacitors. The receivers reduce RS-232 inputs (which may be as high as ± 25 V), to standard 5 V TTL levels. These receivers have a typical threshold of 1.3 V, and a typical hysteresis of 0.5 V and accept ±30-V inputs. The advantage of MAX232 is that it uses +5V power supplies same as the source voltage of PIC 16873A.

Feature for MAX232:

ü  Operate with single 5V supply

ü  Operate up to 120kbit/s

ü  Two drivers and two receivers

ü  ±30-V input levels

ü  Low supply current ,typical : 8 mA

ü  Designed to be interchangeable with MAX232

ü  Applications:TIA/EIA-232-F, Battery-Powered Systems, Terminals, Modems, Computers

                                                   Figure 1: MAX232 pin diagram

GSM Modem

                                               

A GSM modem is a wireless modem that works with a GSM wireless network. A wireless modem behaves like a dial-up modem. The main different 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.

Typically, and external GSM modem is connected to a computer through a serial cable. In order to operate, a GSM modem requires a SIM card from a wireless carrier like a GSM mobile phone. A GSM modem supports a common and extended set of standard AT commands. With the extended commands, the GSM modem can be used as:

ü  Reading, writing, and deleting SMS messages.

ü  Sending SMS messages.

ü  Monitoring the signal strength.

ü  Monitoring the charging status and charge level of the battery.

ü  Reading, writing and searching phone book entries.

The number of SMS messages that can be processed by a GSM modem per minute is very low, which is only about six to ten SMS messages per minute. The GSM net used by cell phones provides a low cost, long range, wireless communication channel for application that need connectivity rather than high data rates. Machinery such as industrial refrigerators and freezers, HVAC, vending machines, vehicle services and others could benefit from being connected to GSM system.

                                                              Figure 2: GSM Modem

RS232

RS232 is commonly used in computer serial port. The RS232 is a standard for serial binary data signal connecting between a DTE (Data Terminal Equipment-computer) and a DCE (Data Circuit-terminating Equipment-modem). This devices will be sending and receiving signals Generally, terminal and computers have male connectors with DTE functions, and modem have female connectors with DCE pin functions. Other devices may have any combination of connecter gender and pin definitions. Nowadays, many terminals were manufactured with female terminals but were sold with a cable with male connectors at each end.

To connect with GSM modem, the connection of RS232 cable pin diagram is as follows:

                                 Figure 3: RS232 null modem with loop back handshaking

PROJECT PROPOSAL (DRAFT 1)

PROJECT PROPOSAL (DRAFT 1)

GSM ACCIDENT NOTIFICATION SYSTEM

STUDENT NAME: AKMAL AKRAM BIN ABU BAKAR

ID NO: 51210210294

INSTITUTION: BRITISH MALAYSIAN INSTITUTE

SECTION: ELECTRICAL

SUPERVISOR: SIR MUHYI BIN YAAKOP

DATE: 5 FEBRUARY 2012

                                               INTRODUCTION

The general purpose of an accident notification using GSM are to implement an accident notification system wirelessly using one of the wireless communication using Global System for Mobile Communications (GSM) and to give early occurrence of an accident and detected the location where the accident happened by using Global Positioning system (GPS). News and location of an accident should be known early by family members and close friends at some distance.

Accident notification using GSM was found to be one of the best methods to ensure that the accident should be known by family members and close friends, by this we get the intimation very quickly and we save their lives by taking some correct decision. A GSM modem is a wireless modem that works with a GSM wireless network. A wireless modem behaves like a dial-up modem. The main different 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. The number of SMS messages that can be processed by a GSM modem per minute is very low, which is only about six to ten SMS messages per minute. The GSM net used by cell phones provides a low cost, long range, wireless communication channel for application that need connectivity rather than high data rates. Machinery such as industrial refrigerators and freezers, HVAC, vending machines, vehicle services and others could benefit from being connected to GSM system.
          While using GPS to detected the location of an accident, family members and close friends can know the location early and taking fast and correct decision. The GPS is a space based satellite navigation system that provides location and time information in all weather, anywhere on or near the Earth, where there is an unobstructed line of sight to four or more GPS satellites. the system imposes some technical limitations which are only removed for authorized users. The GPS program provides critical capabilities to military, civil and commercial users around the world. In addition, GPS is the backbone for modernizing the global air traffic system.

This research study will reviews the configuration of GSM module and GPS which will then be used as case studies to test and validate the proposed accident notification system. Sensitivity analysis techniques will be proposed and conducted to identify areas of improvement to the accident notification.

                                            PROJECT OBJECTIVES

There are several objectives in order to complete this “GSM Accident Notification System”. The objectives are:-

Ø  To implement an accident notification system wirelessly using one of the wireless communication using Global System for Mobile Communications (GSM) and Global Positioning System (GPS).

Ø  To design and develop a prototype of GSM Accident Notification Systems.

Ø  To integrate between GSM phone functionally with GPS system.

                                                             METHODOLOGY

There are 2 methodologies that we will use which are software and the hardware.

1.      For the hardware, the equipment that we used is, the sensors that relates to our project, such as vibration sensor or shock sensor. The function of all this sensor is to sense the vibration whenever the vehicle met an accident. By getting the information from these sensor, the microcontroller will process the data and send the other task to the equipment.

2.     The software that we will used is PIC microcontroller, that were function as the controller and main function of the system.

TIME PLAN

Project title: GSM Accident Notification System

                                                                           SEM 1/12

                                                                                    

                         

                                                                           SEM 2/12