Cellular Services using Cell Phone Modem

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Cellular Services usingCell Phone Modem

• Palak Shah, Ranjul Gelda, Huzaifa Biviji

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Contents

• Motivation
• Goals
• Approach
• Components
• Difficulties Faced
• Future Enhancements
• Questions

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Motivation

• Loads of onfield devices
• Make data acquisition easier
• Develop a base application

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Goals

• Sending SMS
• Making Calls
• Developing a GUI

Serial communication
Number and Text
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Approach

• Understand the AT-Commands
• Develop a C application for serially sending
  AT-Commands
• Convert to dll
• Develop GUI to use dll

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Hardware

• eBox 2300
• x86 embedded computer system
• Runs Windows CE 6.0
• Two Com ports
• Cell Phone Modem
• Supports GSM and GPRS
• Connects to the ebox via a serial cable

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Software

• OS
• Dynamic Link Library
• GUI

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Pseudo Code

• open serial port with the right settings
• send initialization commands to the modem
• return control to the GUI
• accept command from the user along with the
  inputs
• send appropriate AT-Commands to the modem using
  the dll
• if user wants to exit close the serial port

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GUI
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Difficulties Faced

• Linking errors due to sms.lib
• smsSendMessage failure
• Opening the serial port in C

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Disadvantages
Advantages

• Ease of Use
• No requirement of dedicated network
• Long distance coverage
• Easy addition of devices

• Slow
• Cost

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Future Enhancements

• Receive SMS
• Accept incoming Calls
• Voice communication
• Access internet
• Attach to sensors to create remote sensing
  systems
• Security System

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Questions?