Dual tone multi-frequency- based computer interface for remote access and control of instruments

Date

10-2001

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Nelio C. Altoveros

Abstract

A Windows-based program that allows remote accessing of computer-interfaced devices through the use of a touch telephone was developed and evaluated. The functionality of the program was demonstrated using a computer interfaced temperature monitor/controller. A temperature sensor, LM3911 was used to convert temperature reading into electrical signal. An ADC converts the analog signal from the sensor so that it can be processed by the program. A parallel port-interfaced control switch was also used to turn on/off the heating device. The program can accept incoming calls and check if the caller have the authority to use the program by asking and verifying passwords The program also checks every two seconds if the maximum temperature setting had been reached and then call a specified telephone number to notify the receiver that this happened. It gives the remote users the ability to know the current temperature reading, turn on/off the heating device and change the maximum temperature setting. The local users have additional options of specifying the telephone number to be dialed, set the caller password and set the number of rings before answering an incoming call The program's accuracy of giving the temperature reading is 73%, the accuracy for checking the maximum temperature settings 75%, the accuracy for password checking is 100%, remotely switching on/off the switch has 100%, and remotely changing the maximum temperature setting has 100%. This program can be used both for scientific and ordinary home use once it is improved.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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