GSM Shield library
GSM coding is significantly facilitated by using the GSM library. The library consists of a few header files and examples. The header files encompass AT commands to start up SIM900 and test the serial communications between Arduino and GSM. Moreover, several functions are integrated in the library to facilitate sending text messages, making phone calls and data transfer. It is worthwhile to note that two GSM libraries can be found on the internet, including GSM_Shield library and GSM-GPRS-GPS-Shield library. Both libraries have been tested in the project and it has been found out that the former is not functional. Therefore, the latter is used.
The GSM-GPRS shield header files include: call.h, GPS.h, GSM.h, HWSerial.h, inetGSM.h, log.h, SIM900.h, sms.h, Streaming.h and Widetextfinder.h. In this project, the objective of GSM shield is to send a text message upon detection of an intruder. The libraries required for sending a text message are SIM900.h and sms.h.
The code for sending a text message is shown below. After declaring the header files, variable “sms” of type SMSGSM is declared. The Boolean variable “started” is used to check whether the shield is started or not. The first function sets up the GSM shield. In the first step the serial port of Arduino is started at a Baud rate of 9600 and then a text message is sent to the serial port. The text messages can be monitored using “Serial Monitor” tool in Arduino IDE or on any serial communication software on a PC. This helps examining the operation of GSM and making sure that it is started without any error. Then, the command “gsm.begin” is used to start GSM. The command encompasses a large number of AT commands, which aim at testing the communication link between GSM and Arduino and starting up the GSM. The serial communication is tested for several different Baud rates. By attempting Baud rates from 19200 to 2400, the maximum valid Baud rate is found. After establishing serial communication, the GSM is started. It is worthwhile to point out that prior to starting up the GSM, the SIM900 has to be turned on by pressing the SIM900 power button on the shield. Otherwise, the program will get stock on “gsm.begin” and the system will not work. Another necessary condition for starting up the GSM is proving appropriate power source. If GSM starting is successful, it will return “1”and the message “status=ready” is printed on the serial monitor.
Roommate conflict can be described as incompatible differences between two or more unrelated people sharing a living space where the needs of each are either met or obstructed by the other (Knapp, Putnam & Davis, 1988). Roommate conflicts can be dealt with in many ways depending on the issue and the closeness of the relationship of the individuals. Some of these ways are through face-to-face communication and text messaging.
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Cellphones have changed physically and technologically throughout the decades. From the militarized phone bags that were used to give orders during war to the more modernized, smaller, multi-use cellphones where anything can be found
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Cell phones are a miracle to modern day living. Unlike previous eras where communication was done strictly across a hard-wired telephone line, cell phones now give the freedom to those that can afford them a radio-based uplink to the rest of the world. Not only are they for voice communication, but they also allow for transmission of virtually any kind of digital data.
Analysis of the Environment of the Mobile Network System Executive Summary 3 Glossary of Abbreviations 4 Introduction 5 Recent History
Many people in today’s society rely on technology to help us with our daily lives and help us stay connected to family, friends, and other people. The advancements in today’s cell phone technology is very complex and made to be efficient for their owners, allowing them to surf the net and IM message people instantly. Cellphones in particular have developed very fast in the past 15 years. From my childhood, cell phones have evolved from the old school Nokia bricks that allowed texts, calls, and simple graphic games, to todays I-Phones that have higher computable capabilities than some computers. In the United States alone, there is an estimated population of around 297 million people, and 197 million people are subscribed to cell phone companies (Starr). With so many people in today’s society with so much power and opportunity in the palm of their hands, we shouldn’t forget that “With great power comes great responsibility” –Voltaire.
In recent years texting has become one of the most popular ways to stay in touch with the people around you. Texting is something that occurs every day and almost everyone does it. One of the
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Smartphone’s, PADs, tablet computers and other handheld devices that are used to run over operating system are called mobile operating system (Mobile OS). A specified data and programs that run over the mobile devices are referred as mobile operating system. It handles all the hardware and optimizes the performance of the application software in the device. Mobile multimedia functions, Internet connectivity and many other applications are handled by mobile operating system. Base infrastructure software inherent of a computerized system is operating system. It controls all primitive operations of the computer such as PDA and Smartphone. To install and execute the third party applications (known as apps) by users are allowed in the operating system devices. It enumerates new functionalities of the devices. Today mobile devices with a desired OS are called Smartphone’s and a wide range of applications for instances games, apps,communication or social media apps, digital maps, etc are used by users.
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frequency carrier while the user is moving within a telephone service area. In addition to telephony, modern mobile phones support a variety of other services, such as text messaging, email, Internet access, short-range wireless communications, business applications, gaming, and photography. Cell Phones which offer these and more general computing capabilities are referred to as smartphones. Cell Phones are now a way of life in the generation we live in and call home today, and cell phones have changed and benefited our world. By means of texting , making calls, gaming applications, saving people’s lives , helping people while
One of the latest advancements in wireless data. It is used in GSM (Global System for Mobile Communications) for transferring data in packets.