bluetooth attendance system design

Bluetooth networking transmits data via low-power radio waves. It communicates on a frequency of 2.45 gigahertz (actually between 2.402 GHz and 2.480 GHz, to be exact). This frequency band has been set aside by international agreement for the use of industrial, scientific and medical devices (ISM). A number of devices that you may already use take advantage of this same radio-frequency band. Baby monitors, garage-door openers and the newest generation of cordless phones all make use of frequencies in the ISM band. Making sure that Bluetooth and these other devices don t interfere with one another has been a crucial part of the design process. One of the ways Bluetooth devices avoid interfering with other systems is by sending out very weak signals of about 1 milliwatt.

By comparison, the most powerful cell phones can transmit a signal of 3 watts. The low power limits the range of a Bluetooth device to about 10 meters (32 feet), cutting the chances of interference between your computer system and your portable telephone or television. Even with the low power, Bluetooth doesn t require line of sight between communicating devices. he walls in your house won t stop a Bluetooth signal, making the standard useful for controlling several devices in different rooms.

Bluetooth can connect up to eight devices simultaneously. With all of those devices in the same 10-meter (32-foot) radius, you might think they d interfere with one another, but it s unlikely. Bluetooth uses a technique called spread-spectrum frequency hopping that makes it rare for more than one device to be transmitting on the same frequency at the same time. In this technique, a device will use 79 individual, randomly chosen frequencies within a designated range, changing from one to another on a regular basis. In the case of Bluetooth, the transmitters change frequencies 1,600 times every second, meaning that more devices can make full use of a limited slice of the radio spectrum.

Since every Bluetooth transmitter uses spread-spectrum transmitting automatically, it’s unlikely that two transmitters will be on the same frequency at the same time. This same technique minimizes the risk that portable phones or baby monitors will disrupt Bluetooth devices, since any interference on a particular frequency will last only a tiny fraction of a second.

bluetooth attendance

An Automated Biometric Attendance Management System with Dual Authentication Mechanism Based on Bluetooth and NFC Technologies
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Abstract:Attendance Management System (AMS) is the easiest way to keep track of attendance for community organisations for day-to-day monitoring of attendance and manpower analysis. AMS comes in four types. These are Manual, Biometric, Card-based

Cloud Based Intra-College Information Communication With Bluetooth Attendance System Using Mobile Clients
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Abstract: In this paper, authors about the cloud computing architecture and other aspects that are required for communication over cloud. The users primarily focus on using web services through mobile phones. Cloud computing is the use of computing resources that

Staff Attendance and Monitoring System Using Bluetooth via Wired Network and File Sharing System for Android User in Grid Server
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ABSTRACT Today the location of a staff will be tracked or monitored only by the tower, GPS and android applications inside the college or university. We propose a Bluetooth based staff monitoring system for both GPS and non GPS mobile user. So that we can get the full

The Bluetooth Based Attendance Tracker
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Abstract:This paper proposes a better solution for tracking Students' Attendance. The proposed system provides automation of student attendance tracking using wireless technology such as Bluetooth and scalability using integration of databases and cloud

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ABSTRACT Wireless communication is one of the fastest-growing technologies. The demand for connecting devices without the use of cables is increasing everywhere. Wireless LANs can be found on college campuses, in office buildings, and in many public areas. In

MITSAT-An Automated Student Attendance Tracking System using Bluetooth and EyeOS
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Abstract-This paper proposes a novel solution MITSAT (Madras Institute of Technology Student Attendance Tracking system). MITSAT provides automation of student attendance tracking using wireless technology such as Bluetooth and scalability using cloud

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ABSTRACT Nowadays, several office, company, or organization, whether governmental or non-governmental organizations are still using manual or traditional methods to record the attendance of their staff. More than that, they used a punch card machine. In line with

request paper-Portable 4 Wire Bioimpedance Meter with Bluetooth Link

Portable 4 wire bioimpedance meter with bluetooth link
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Abstract To allow some clinical research based on bioimpedance measurements a small and easy to use device that can be used in the clinical environment is needed. A portable device for 4 wire bioimpedance monitoring is presented. It consists of a battery powered