NoiseMeter

Project NoiseMeter
File:NoiseMeter.jpg
Measuring audio noise as citizen science
Status	Initializing
Contact	bertrik
Last Update	2023-10-12

Introduction

This project is about measuring environmental audio noise as citizen science.

For example, noise can be:

• road traffic noise (cars, mopeds, etc)
• air traffic noise,
• industrial noise, like building activities

Existing sound/noise meter projects:

• LoRa sound kit by Marcel Meek
• DNMS project by Helmut Bitter
• Amsterdam sounds kit from Waag Society,
• Unknown sensor tested by RIVM in Schiedam (mentioned on https://www.samenmetenaanluchtkwaliteit.nl/nieuws/citizen-science-geluidmetertest-op-rivm-terrein )
• Sound meter by Bart Jurgens uit Amerongen, link ???

This project is about a kind of clone of the Amsterdam Sounds project.

hardware

Nano33 IOT

Nano33 IOT pinout

Hardware is a Nano 33 IoT board.

Connections

SPH0645	nano33 iot	Remark
SEL	-	leave unconnected
LRCK	A2 (16) - I2S FS	sample clock
DOUT	D4 (4) - I2S SD	data
BCLK	A3 (17) - I2S SCK	bit clock
GND	GND
3V	3v3

Software

The software is based on arduino, built using platformio.

• software repo

Casing

I'm looking into several options:

Junction box

Simple junction boxes sold by Gamma:

• https://www.gamma.nl/assortiment/attema-kabeldoos-m20-met-3-wartels-ip65/p/B410376 and
• https://www.gamma.nl/assortiment/attema-kabeldoos-ip65-3x-m25-m20/p/B306878 (IP65)

A downward pointing hole can be used for an 868 MHz LoRaWAN antenna.

Sensor.community casing

See https://sensor.community/docs/dnms/dnms-noise-measuring-dn40-result.jpg

Dimensions:

• microphone is on a half inch (12.7 mm OD) white polystyrene pipe, 115 mm long
• main piece is 25mm, length 160mm
• some other connecting piecess

"RIVM" test casing

Exact dimensions unknown, see photo on this page: https://samenmeten.nl/nieuws/citizen-science-geluidmetertest-op-rivm-terrein

My guess:

• microphone is on a 10mm diameter pipe, length 100mm
• main case is a 40mm diameter pipe, length 200mm