Faculty of Engineering

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Subject: search.filters.subject.Bluetooth

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    PublicationOpen Access
    PORTABLE SENSOR ATTACHMENT
    (SAITM Research Symposium, 2013) Chandrasiri, L. H. R. P; Abhayasinghe, N
    The rapid development of technology is placing an enormous demand for smart phones and similar devices as we are requiring more and more from these mobile devices. One of the major products which are becoming increasingly popular is the mobile phone. There are many sensors that may be used in such applications and some of which are: the accelerometer, digital compass, gyroscope, temperature, camera, etc. These sensors help enable new applications such as guiding systems, social network, health, gaming, entertainment, education, transportation, and many more. This paper presents the design, development and implementation of a portable sensor attachment that includes several sensors. The device includes sensors such as accelerometer, gyroscope, light level, atmospheric pressure, temperature and compass that may be used for human gait analysis, indoor/outdoor localization and navigation. This device can be coupled with any Bluetooth enable host device and data will be transferred to the host for further processing.
  • Thumbnail Image
    PublicationOpen Access
    Bluetooth Embedded Portable Oscilloscope
    (2013) Seneviratne, H. M. D. B; Abhayasinghe, K. N
    Portable oscilloscopes currently in the market are very expensive, less power efficient and have small low resolution displays. This paper presents the design and implementation of a low cost, portable, lightweight; low power, dual-channel oscilloscope, consisting of a hardware device and a software application. The device is equipped with a Bluetooth module to provide connectivity to a device with Bluetooth, running the Android operating system (OS), in order to display the waveforms. Android OS is selected because there are a decent number of Android device users and most of these devices satisfy the requirements of the oscilloscope’s software application. The hardware device includes circuitry to capture the input voltage signals and an embedded Bluetooth module for transmitting the captured signal information to an Android device for displaying the waveform. The Software application developed for Android receives the data transmitted from the hardware device and plots the waveform according to the display settings configured by the user. These display configurations are transmitted to the hardware device once they are set by the user, and are used by the hardware device to set the sampling rate and the values of samples. For optimal use of the available bandwidth, the application provides two modes of operation, namely single channel mode where only channel 1 is operational and dual channel mode where both channels 1 and 2 are operational. The user can select a mode from the application, which in turn sends a message to the microcontroller which then changes the sampling frequency accordingly: a higher sampling rate for single channel and half of that for dual channel.