supershinyeyes / spl-meter-with-rpi

Sound Pressur Level meter with RPI using Python

Raspberry Pi SPL meter

• Sound Pressur Level meter with RPI implemented with Python.
• Author: Seyoung Park
• Date: 2016 Feb. 23rd

Demo

Requirements

HW

• Raspberry Pi(1 or 2)
• Microphone (Webcam)

Docker

I made a Docker image for non-gui version.

# Run this command at the project dir
# Pull the image
docker pull shinyeyes/rpi-spl-meter:v0.1

# Enter the container
docker run -it --privileged -v /dev/bus/usb:/dev/bus/usb shinyeyes/rpi-spl-meter:v0.1

# Run this command in the container
$HOME/miniconda/envs/spl-meter/bin/python spl_meter_text.py

GUI version

SW

• Python 2
• EasyProcess==0.2.2
• numpy==1.10.4
• PyAudio==0.2.9
• PyVirtualDisplay==0.1.5
• scipy==0.17.0
• selenium==2.52.0
• wheel==0.24.0

Filter: A-weighting

I applied A-weighting to filter to filter the stream. A-weighting results frequencies which average person can hear. For further information read: Frequency Weightings - A-Weighted, C-Weighted or Z-Weighted? For the actual programmatic implementation I borrowed the code from endolith and is saved as /spl_lib.py. A-weighting() is translated from [MATLAB script](: http://www.mathworks.com/matlabcentral/fileexchange/69).

spl-meter-with-rpi's Issues

[Errno -9981] Input overflowed follow by [Errno -9988] Stream closed

Hello,
I ran in the same problem as servas089 (He solve his problem with [https://raspberrypi.stackexchange.com/questions/47045/hcitool-scan-says-no-such-device]).

First reading fine (read the dB(A) correctly) then Error Input overflowed follow by Error stackhoverflow

(1) Error recording: [Errno -9981] Input overflowed
(2) Error recording: [Errno -9988] Stream closed
(3) Error recording: [Errno -9988] Stream closed
Traceback (most recent call last):
File "/home/pi/Bureau/spl-meter-with-RPi-master/spl_meter.py", line 116, in
listen()
File "/home/pi/Bureau/spl-meter-with-RPi-master/spl_meter.py", line 91, in listen
print(" (%d) Error recording: %s" % (error_count, e))
File "/usr/lib/python2.7/idlelib/PyShell.py", line 1356, in write
return self.shell.write(s, self.tags)
KeyboardInterrupt

The code is not tweaked, on Pi 2 B. I try a lot of Chunk and Rate number with no sucess.

There is a USB microphone plug to the Pi (the first reading varie according to the noise, so I assume the microphone is not faulty ?).

I really a # noob at Pi and programming but good in Acoustics.

I installed all the prerequisite (pyaudio, selenium, etc) but I don't know if I must take the new one or the prerequisite with theyre version number.

I am very sorry to bother you, I think it's my poor knowledge of the programming and Pi stuff that lead me to this point.

It seem that servas089 as a Pi 3, let me know if you think that I must buy a Pi 3 instead of a Pi 2.

All help will be very appreciated

Yannick

For more information there is the Python consol output:

====== RESTART: /home/pi/Bureau/spl-meter-with-RPi-master/spl_meter.py ======
Listening
A-weighted: +24.10 dB
update_max_if_new_is_larger_than_max called
max observed
(1) Error recording: [Errno -9981] Input overflowed
(2) Error recording: [Errno -9988] Stream closed
(3) Error recording: [Errno -9988] Stream closed

Traceback (most recent call last):
File "/home/pi/Bureau/spl-meter-with-RPi-master/spl_meter.py", line 116, in
listen()
File "/home/pi/Bureau/spl-meter-with-RPi-master/spl_meter.py", line 91, in listen
print(" (%d) Error recording: %s" % (error_count, e))
File "/usr/lib/python2.7/idlelib/PyShell.py", line 1356, in write
return self.shell.write(s, self.tags)
KeyboardInterrupt

And for more information
Pi 2B
pi@raspberrypi:~ $ cat /proc/asound/cards
0 [ALSA ]: bcm2835 - bcm2835 ALSA
bcm2835 ALSA
1 [Device ]: USB-Audio - USB PnP Sound Device
C-Media Electronics Inc. USB PnP Sound Device at usb-3f980000.usb-1.5, full spe

Error recording: [Errno -9988] Stream closed

Hi, am trying to implement your project. I am almost done. One (initial) single value is displayed in the browser and written to the 2 log files. Unfortunately it directly exits the program with the following error message:

(96097) Error recording: [Errno -9988] Stream closed
(96098) Error recording: [Errno -9988] Stream closed
(96099) Error recording: [Errno -9988] Stream closed
Traceback (most recent call last):
File "spl_meter.py", line 117, in
listen()
File "spl_meter.py", line 92, in listen
print(" (%d) Error recording: %s" % (error_count, e))

Maybe this is something because of the CHUNK value. I have tried serveral values withou success, but I am also not sure how to calculate the correct and value and if it is the cause of the error.

Looking for any kind of ideas that make me the next step.

thanks
kr

Please Add Steps on how to install to Raspberry Pi

Hi!
I am new to raspberry pi but I have been a long time arduino user.
The video demo in youtube sent me here and I want to try your code.
I am using a Raspberry Pi 3 with a USB mic.
Can you please help us newbies on how to install your library?
I did "git clone https://github.com/SuperShinyEyes/spl-meter-with-RPi"
but I don't know how to install the requirements and I don't know what docker is for.

I hope you can help. Thank you in advance!

can this code to rasspberry pi 3?

Add license

Hi- I'd like to use some of your code in a project I'm working on. Would you mind adding a license to confirm that it's open source? https://help.github.com/articles/adding-a-license-to-a-repository/

Thanks!

Docker pull not found

Hi,

It appears the docker container is no longer hosted on Docker Hub

"Error response from daemon: manifest for shinyeyes/rpi-spl-meter:v0.1 not found"

HOW TO RUN

Hello Shin,

I have installed all the libraries you have suggested and I changed the rate but when I run spl_meter.py an error stating that init driver cannot run. please help me to solve the error