2 layers44 × 31 mm
Noisemeter
CivicTechTO/tRacket-sensor
Design files and source code for the tRacket noise sensor
30 parts11
2 layers50 × 50 mm
Noisemeter
CivicTechTO/tRacket-sensor11Design files and source code for the tRacket noise sensor
- Size
- 50 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 32
- Nets
- 42
- Pads
- 138
- Tracks, vias
- 109, 50
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 31 Dec 2023
- Updated
- 19 Jul 2026
Overview
Noisemeter is an open-source printed circuit board by CivicTechTO, from the CivicTechTO/tRacket-sensor repository on GitHub. It is a 2-layer board of 50 × 50 mm with 32 parts on 42 nets, routed with 109 tracks and 50 vias.
It is built around the ESP32-C3-MINI-1-N4, AP2112K-3.3 and SPH0645LM4H-B. Its parts include 10 resistors, 7 capacitors, 2 ICs, 2 diodes and 2 connectors. It belongs with the audio and music and sensors and measurement boards and the ESP32 and RISC-V boards of this library.
Main components
3
ESP32-C3-MINI-1-N4
SMD,16.6x13.2mm-40℃~+85℃ -98dBm 20.5dBm 350mA 3V~3.6V 84mA Integrated temperature sensor、Integrated antenna、Built-in watchdog On-board PCB Antenna SPI、UART、I2C、I2S、USB Transceiver SMD,16.6x13.2mm WiFi Modules ROHSEspressif SystemsRF Modules
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorised
SPH0645LM4H-B
SMDSMD Sourcing Parts ROHSKnowlesMEMS Microphones
README
README.mdtRacket: Community-Driven Urban Noise Monitoring
This repository contains all source code and hardware design files for the tRacket noise sensor.
Overview
Environmental noise, especially in urban settings, is a known public health concern:
The growing body of evidence indicates that exposure to excessive environmental noise does not only impact quality of life and cause hearing loss but also has other health impacts, such as cardiovascular effects, cognitive impacts, sleep disturbance and mental health effects.
The tRacket noise sensor continuous monitors ambient sound levels (in decibels, dBA) and sends these measurements to an online dashboard (also on GitHub). Our goal is to help local communities better understand the sound levels and extreme noise events that they experience day to day.
The project has been started and is maintained by volunteers from the CivicTech Toronto community.
Privacy
We followed Privacy by Design principles in setting up the data collection.
- The sound meter devices are deployed on private properties in residential areas at different locations in the city. We are not publishing exact device locations.
- The devices do not record sound only sound levels in A-weighted decibel levels (dBA)(https://en.wikipedia.org/wiki/Decibel).
- We calculate minimum and maximum sound levels at 5 minute intervals on the device and only broadcast these aggregate values (along wiht the device ID) to a database.
Source Code
The noisemeter-device folder contains the device's source code, which is written in C++ and can be built using PlatformIO. Build instructions are available in the online documentation.
The source code is released under the GNU GPL v3 license.
Hardware Files
The hardware folder contains design files and documentation for each iteration of the sensor hardware. The PCBs are designed using KiCAD.
The hardware design files are released under an open hardware license.
For Developers
- Check out the Issues page to see current bugs and feature requests. Any contributions are welcome!
- Online documentation of the firmware is available here.
Parts
32| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole_Pad | MountingHole:MountingHole_2.5mm | H1, H2, H3, H4 |
| 3 | 10K | Resistor_SMD:R_0603_1608Metric | R4, R5, R6 |
| 3 | 1U | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3 |
| 3 | 51 | Resistor_SMD:R_0603_1608Metric | R2, R3, R10 |
| 3 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP2, TP3 |
| 2 | 0 | Resistor_SMD:R_0603_1608Metric | R1, R7 |
| 2 | 0.1U | Capacitor_SMD:C_0603_1608Metric | C5, C6 |
| 2 | 150 | Resistor_SMD:R_0603_1608Metric | R8, R9 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | D1, D2 |
| 1 | 10U | Capacitor_SMD:C_0805_2012Metric | C4 |
| 1 | 200P | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J2 |
| 1 | ESP32-C3-MINI-1-N4 | noisemeter:XCVR_ESP32-C3-MINI-1-N4 | U2 |
| 1 | SPH0645LM4H-B | noisemeter:MIC_SPH0645LM4H-B | MK1 |
| 1 | SW_Push | Button_Switch_SMD:SW_SPST_TL3305A | SW1 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Molex_47346-0001 | J1 |
Questions
How big is the Noisemeter PCB?
It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Noisemeter use?
32 parts, built around the ESP32-C3-MINI-1-N4, AP2112K-3.3 and SPH0645LM4H-B. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Noisemeter KiCad files?
From the CivicTechTO/tRacket-sensor repository on GitHub, at the commit this page was made from: the board is hardware/pcb-rev1/noisemeter.kicad_pcb and its schematic hardware/pcb-rev1/noisemeter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Noisemeter design in my own project?
Its repository states no licence, so its author keeps all rights: ask CivicTechTO before reusing the design.
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