https://github.com/ThomasDNguyen/AppDev

#This is version 1 of git Example.

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Acoustic Sensor using RPi3

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Table of Content:

1. Configuration Instructions
2. Installation Instructions
3. Operating Instructions
4. List of Project files
5. Known bugs
6. Contact information of the Programmer
7. Credits and acknowledments

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1. Configuration Instructions

This section contains 2 parts: Hardware configuration and software configuration.

This project is built on a Raspberry Pi3, with a USB sound card and a microphone. Ethernet connection is recommended. If an older version of Raspberry Pi is used, certain change might be necessary.

First you have to set USB sound card as default audio device:

a> Boot up RPi and apply USB sound card. b> RPi onboard sound card doesn't have microphone interface -> change the default audio device to USB sound card c> Use command "lsusb" to check whether USB sound card is mounted.

d> Use “sudo nano /etc/asound.conf”command and put following content to the file: pcm.!default { type plug slave { pcm "hw:1,0" } } ctl.!default { type hw card 1 }

e> Go to your home directory. Use “nano .asoundrc” command and put the same content to the file.

==> Run “alsamixer” and you should be able to see that USB sound card is the default audio device.

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Second you need to downgrade the alsa-utils from 1.0.28 to 1.0.25 :

a> Use “sudo nano /etc/apt/sources.list” command and add the last line: pi@raspberrypi:~ $ sudo aptitude versions alsa-utils

Package alsa-utils: i 1.0.25-4 oldstable 500 p 1.0.28-1 stable 500

b> Run “sudo apt-get install alsa-utils=1.0.25-4” to downgrade.

c> Reboot (if necessary)

d> Run “arecord -r44100 -c1 -f S16_LE -d5 test.wav” to test that your microphone is working. You should see a “test.wav” file in the current folder.

e> Put earphone on. Run “aplay test.wav” to check that your recording is okay.

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2. Installation Instructions

2.1> Download all the source file from this URL : https://github.com/

2.2> Open a computer with Linux OS

2.3> Go to the folder contain all the source file and type "make" (others command can be seen in makefile)

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3. Operation Instructions

• After the installation, simply execute "./wave.a" in the project folder.
• The screen will display the waveform (remember to change setting language UTF-8 of the Linux terminal for the bar character)
• The screen will also show the duration ,bits per sample and sample rate's values
• A log file has been made in order to record all the previous data and can be viewed in here :http://www.cc.puv.fi/~e1601122/php/sound.log

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4. List of project files

The projects contains following files:

--README.md : this file

--makefile : the makefile of this project

--wave.c : the module containing functions about wave processing

--wave.h : the header of wave.c

--screen.c : the module containing functions about screen manipulation

--screen.h : the header of screen.c

--comm.c : the communication module using libcurl

--comm.h : the header file of comm.c

--main.c : contains main() function

--raspsound.php : the server page to receive data

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5. Known Bugs

• No known bugs detected. Program runs smoothly

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6. Contact information of the Programmer

• Name: Nguyen Duy Thanh
• email: [email protected]
• face book: https://www.facebook.com/thanh.nguyenduy.148

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7. Credits and acknowledgments

1> Mr. Gao Chao -- Email: [email protected] 2> References : https://en.wikipedia.org/wiki/README 3> Curl library -- Webpage: https://curl.haxx.se/

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AppDev