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https://github.com/ThomasDNguyen/AppDev

#This is version 1 of git Example.

Acoustic Sensor using RPi3

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
  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.

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.

  1. 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)

  1. 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
  1. 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

  1. Known Bugs
  • No known bugs detected. Program runs smoothly
  1. Contact information of the Programmer
  1. 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/

	# THE END #

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AppDev