GSM Modem
A GSM modem is a device which can be used by a computer or any processor to communicate over a network. It requires a SIM (Subscriber Identity Module) card to operate and operates over a network range subscribed by the network operator. It can be connected to a processor through USB, serial or Bluetooth connection. A GSM modem exposes an interface that allows applications such as SMS to send and receive message. Message sending and receiving was performed directly on a mobile phone and charges by the mobile operator. To perform these tasks, a GSM modem must support an “extended AT command set” for sending/receiving SMS messages, as defined in the ETSI GSM 07.05 and3GPP TS 27.005 specifications. GSM modems can be a quick and efficient way to get started with SMS, because a special subscription to an SMS service provider is not required.
GPS Module
The Global Positioning System (GPS) Receiver Module is a low-cost, fully integrated with on-board patch antenna which provides standard, raw NMEA0183 (National Marine Electronics Association) information or specific data, such as latitude, longitude, altitude, current time, date, speed, and travel direction through a serial interface. The GPS able to calculate the position and time accurately when it receives the data from each satellite. GPS systems contain three segments; GPS satellites, ground control stations and GPS receiver. GPS able to work when signal of time is first sent from GPS satellite at a given point. Then the time difference between GPS time and point of time clock when GPS receiver receives the time signal is calculated to generate the distance from receiver to the satellite.
This system using Arduino as microcontroller to work on this safety device. It is an open-source platform used for building electronics projects. Arduino consists of both physical programmable circuit board can be referred as a microcontroller) and a software, or IDE (Integrated Development Environment) that can be runs with computer to write and upload computer code to the physical board.
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