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.
Content
1. Assignment
2. Concepts
2.1 Using the sound board of a personal computer
2.2 Using the USB-Interface
3. Low-pass-filter
3.1 Motivation to use a low-pass-filter before digitizing
3.2 Kinds of low-pass-filters
3.3 Development of Butterworth-low-pass filters in general
3.4 Designing a Butterworth low-pass filter of 6th order
3.4.1 Measurement results
4. Digitising and preparation of the signal
4.1 Sampling
4.2 Quantization
4.3 Coding
4.4 Requirements for digitising ELF-signals
4.4.1 Anti-aliasing filter
4.4.2 Sample frequency
4.4.3 Resolution
4.5 Microcontroller and adapting circuits
4.5.1 Sigma-Delta-ADC
5. Data exchange
5.1 The SPI-Bus in general
5.2 Initialization of SPI with the MSP430F2013 microcontroller
6. USB-Interface
6.1 Requirements to transfer the data into the compute
6.2 The IO-Warrior56 (IOW56)
6.2.1 Normal mode function
6.2.2 Special mode function
7. Interaction
8. Power supply
9. Software
10. Appendix
10.1 Circuit diagram
10.2 Board, layout and bill of material
10.3 Used formulaic symbols
10.4 Used equipment
10.5 List of sources
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