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Development of a low-power-signal acquisition device for signals lower than 25 Hz

Title: Development of a low-power-signal acquisition device for signals lower than 25 Hz

Diploma Thesis , 2012 , 58 Pages , Grade: 2.0 bzw."B"

Autor:in: Dipl.-Ing. Franz Peter Zantis (Author)

Electrotechnology
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Summary Excerpt Details

Design a signal detection device for detection and digitization of weak signals with frequencies up to 25 Hz before their transmission into a personal computer (PC). The device should contain an input low-pass filter with a cutoff frequency of 25 Hz, a preamplifier, microcontroller MSP430F2013 for digitization and preparation of the digitized signals for transmission into the PC via USB interface.

Excerpt


Inhaltsverzeichnis (Table of Contents)

  • Assignment
  • Concepts
    • Using the sound board of a personal computer
    • Using the USB-Interface
  • Low-pass-filter
    • Motivation to use a low-pass-filter before digitizing
    • Kinds of low-pass-filters
    • Development of Butterworth-low-pass filters in general
    • Designing a Butterworth low-pass filter of 6th order
      • Measurement results
  • Digitising and preparation of the signal
    • Sampling
    • Quantization
    • Coding
    • Requirements for digitising ELF-signals
      • Anti-aliasing filter
      • Sample frequency
      • Resolution
    • Microcontroller and adapting circuits
      • Sigma-Delta-ADC
  • Data exchange
    • The SPI-Bus in general
    • Initialization of SPI with the MSP430F2013 microcontroller
  • USB-Interface
    • Requirements to transfer the data into the compute
    • The IO-Warrior56 (IOW56)
      • Normal mode function
      • Special mode function
  • Interaction
  • Power supply
  • Software
  • Appendix
    • Circuit diagram
    • Board, layout and bill of material
    • Used formulaic symbols
    • Used equipment
    • List of sources

Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)

This diploma thesis aims to develop a low-power signal acquisition device for weak signals with frequencies up to 25 Hz. This device should be capable of digitizing and transmitting the data to a personal computer via a USB interface. The device is intended for use in various applications, including the measurement of extremely low-frequency (ELF) signals. The focus is on creating a cost-effective and user-friendly device that is easy to build and operate.

  • Design and development of a low-power signal acquisition device for frequencies up to 25 Hz
  • Digitization and transmission of acquired data to a personal computer via a USB interface
  • Implementation of a low-pass filter to ensure accurate signal processing
  • Selection and application of appropriate hardware components, including a microcontroller and an analog-to-digital converter
  • Development of software for data acquisition and processing

Zusammenfassung der Kapitel (Chapter Summaries)

  • Assignment: This chapter outlines the task of designing and developing a signal acquisition device for detecting and digitizing signals within the extremely low-frequency (ELF) range (0 Hz
  • Concepts: This chapter explores various methods for capturing and transmitting the signals. It discusses the use of personal computer sound boards and USB interfaces as potential options for data transfer.
  • Low-pass-filter: This chapter focuses on the importance of using a low-pass filter before digitizing signals. It explores different types of low-pass filters and details the development and design of a sixth-order Butterworth low-pass filter. Measurement results from the filter implementation are also presented.
  • Digitising and preparation of the signal: This chapter delves into the processes involved in digitizing the acquired signal, including sampling, quantization, and coding. It examines the specific requirements for digitizing ELF-signals, addressing aspects like anti-aliasing filtering, sample frequency, and resolution. The role of the microcontroller and associated circuits, including the Sigma-Delta-ADC, in the digitization process is also discussed.
  • Data exchange: This chapter covers the use of the SPI-Bus for data exchange. It explains the general functionality of the SPI-Bus and details the initialization process of the SPI interface with the MSP430F2013 microcontroller.
  • USB-Interface: This chapter focuses on the requirements for transferring data into the computer. It introduces the IO-Warrior56 (IOW56) as a potential USB interface solution. The normal and special mode functions of the IOW56 are explored.

Schlüsselwörter (Keywords)

The thesis revolves around the design and development of a low-power signal acquisition device for frequencies up to 25 Hz, focusing on the acquisition and digitization of weak signals. Key aspects include signal processing using low-pass filters, specifically the Butterworth filter, and the application of a microcontroller (MSP430F2013) and a Sigma-Delta-ADC. Data exchange via the SPI-Bus and the use of a USB interface (IO-Warrior56) are also crucial components.

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Details

Title
Development of a low-power-signal acquisition device for signals lower than 25 Hz
College
The Slovak Technical University  (Faculty of electrical engineering and information technology)
Grade
2.0 bzw."B"
Author
Dipl.-Ing. Franz Peter Zantis (Author)
Publication Year
2012
Pages
58
Catalog Number
V196879
ISBN (eBook)
9783656230175
ISBN (Book)
9783656231660
Language
English
Tags
development
Product Safety
GRIN Publishing GmbH
Quote paper
Dipl.-Ing. Franz Peter Zantis (Author), 2012, Development of a low-power-signal acquisition device for signals lower than 25 Hz, Munich, GRIN Verlag, https://www.grin.com/document/196879
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