NoiseMeter: Difference between revisions
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This thing has a bluetooth interface. | This thing has a bluetooth interface. | ||
In short, as I interpret it: | |||
* a basic information service, like all BLE devices have | |||
* a service related to bluetooth parameters, also looks fairly standard, and not related to the measurements themselves | |||
* a custom vendor-specific service, where I suspect the noise-meter specific data is | |||
<pre> | |||
* service 00001801-0000-1000-8000-00805f9b34fb: Generic Attribute Profile | * service 00001801-0000-1000-8000-00805f9b34fb: Generic Attribute Profile | ||
** ... | ** ... | ||
| Line 137: | Line 142: | ||
** characteristic: 0000fff2-0000-1000-8000-00805f9b34fb Write | ** characteristic: 0000fff2-0000-1000-8000-00805f9b34fb Write | ||
** characteristic: 0000ffe0-0000-1000-8000-00805f9b34fb Read, typically 00000001010000000190146821100048 | ** characteristic: 0000ffe0-0000-1000-8000-00805f9b34fb Read, typically 00000001010000000190146821100048 | ||
</pre> | |||
Revision as of 07:38, 21 April 2024
| Project NoiseMeter | |
|---|---|
| File:NoiseMeter.jpg | |
| Measuring audio noise as citizen science | |
| Status | Initializing |
| Contact | bertrik |
| Last Update | 2024-04-21 |
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:
- DNMS project by Helmut Bitter
- LoRa sound kit by Marcel Meek, ESP32 with I2S microphone, shares many concepts with EspAudioSensor
- LoRaWAN PM/Sound sensor by Bas van Drunen, shares many concepts with LoraWanDustSensor
- 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 page considers a kind of clone of the Amsterdam Sounds project.
Other interesting stuff:
- My brother looked inside three inexpensive sound meters: https://twitter.com/jrsikken/status/1779225176464392685
Hardware
Nano33 IOT
Hardware is a nano33 iot board.
| 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, a kind of clone of the Amsterdam Sounds project, modified to use WiFi (instead of LoRa), written by Rene Kuijf.
My modifications consist of a platformio configuration, for easy building.
See AdamSoundsInflux-slim-nano-33 github repo for the source code.
Casing
Microphone protection
To protect the microphone, use a membrane, like:
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
Experiments
Uni-T UT353 BT noise meter
This thing has a bluetooth interface.
In short, as I interpret it:
- a basic information service, like all BLE devices have
- a service related to bluetooth parameters, also looks fairly standard, and not related to the measurements themselves
- a custom vendor-specific service, where I suspect the noise-meter specific data is
* service 00001801-0000-1000-8000-00805f9b34fb: Generic Attribute Profile ** ... * service: 0000ff12-0000-1000-8000-00805f9b34fb: Unknown ** characteristic: 0000ff01-0000-1000-8000-00805f9b34fb Unknown *** descriptor: 00002901-0000-1000-8000-00805f9b34fb Characteristic User Description "Data In" ** characteristic: 0000ff02-0000-1000-8000-00805f9b34fb Unknown *** descriptor: 00002902-0000-1000-8000-00805f9b34fb Client Characteristic Configuration *** descriptor: 00002901-0000-1000-8000-00805f9b34fb Characteristic User Description "Data Out" ** characteristic: 0000ff03-0000-1000-8000-00805f9b34fb Unknown *** descriptor: 00002901-0000-1000-8000-00805f9b34fb Characteristic User Description "Baud Rate" ** characteristic: 0000ff04-0000-1000-8000-00805f9b34fb Unknown *** descriptor: 00002901-0000-1000-8000-00805f9b34fb Characteristic User Description "Link Interval" ** characteristic: 0000ff05-0000-1000-8000-00805f9b34fb Unknown *** descriptor: 00002901-0000-1000-8000-00805f9b34fb Characteristic User Description "Pair code" ** characteristic: 0000ff06-0000-1000-8000-00805f9b34fb *** descriptor: 00002901-0000-1000-8000-00805f9b34fb "BT Name" ** characteristic: 0000ff07-0000-1000-8000-00805f9b34fb *** descriptor: 00002901-0000-1000-8000-00805f9b34fb "Pair Code En" ** characteristic: 0000ff08-0000-1000-8000-00805f9b34fb *** descriptor: 00002901-0000-1000-8000-00805f9b34fb "Adv interval" ** characteristic: 0000ff09-0000-1000-8000-00805f9b34fb *** descriptor: 00002901-0000-1000-8000-00805f9b34fb "TX Power" ** characteristic: 0000ff0a-0000-1000-8000-00805f9b34fb *** ... "MCU Delay" ** characteristic: 0000ff0b-0000-1000-8000-00805f9b34fb *** ... "Mode Control" ** characteristic: 0000fff0-0000-1000-8000-00805f9b34fb *** ... "Factory Set" ** characteristic: 0000fff1-0000-1000-8000-00805f9b34fb *** descriptor: 00002901-0000-1000-8000-00805f9b34fb "Reset" * service: 0000180a-0000-1000-8000-00805f9b34fb Device Information ** ... * service: 0000d0ff-3c17-d293-8e48-14fe2e4da212 Vendor specific ** characteristic: 0000ffd1-0000-1000-8000-00805f9b34fb Write ** characteristic: 0000ffd2-0000-1000-8000-00805f9b34fb Read, typically 40C1F6049BD7 ** characteristic: 0000ffd3-0000-1000-8000-00805f9b34fb Read, typically 01901468 ** characteristic: 0000ffd4-0000-1000-8000-00805f9b34fb Read, typically 21100048 ** characteristic: 0000ffd5-0000-1000-8000-00805f9b34fb Read, typically ...? ** characteristic: 0000ffd8-0000-1000-8000-00805f9b34fb Write ** characteristic: 0000fff1-0000-1000-8000-00805f9b34fb Read, typically 0501000700080000F00F0000 ** characteristic: 0000fff2-0000-1000-8000-00805f9b34fb Write ** characteristic: 0000ffe0-0000-1000-8000-00805f9b34fb Read, typically 00000001010000000190146821100048