HardLabs

Quiet trace

rwrife·quiet-trace·hardware/kicad/quiet-trace.kicad_pcb

Quiet trace PCB layout, top view — open source ESP32 board by rwrife
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About the Quiet trace PCB

Quiet trace is an open source ESP32 PCB design by rwrife, published on GitHub under the MIT license. It is a 2-layer board measuring 80 × 52 mm, with 24 components from 19 distinct parts.

Its main chip is the ESP32-S3-WROOM-1-N8R8, from the ESP32 family. Other key parts include the AP2112K-3.3TRG1, USBLC6-2SC6 and ICS-43434. By type, the board carries 8 resistors, 5 capacitors, 4 ICs, 2 connectors, 2 switches and 2 diodes.

It belongs with the iot & wireless and audio designs in this gallery.

From the project

USB-powered ESP32-S3 ambient sound-level logger for home offices and shared rooms that keeps only privacy-preserving loudness summaries and serves a local history dashboard—never raw audio.

The first revision is a carrier around an Espressif ESP32-S3 module rather than a chip-down RF design. It should remain hand-assemblable, expose recovery and measurement points, and keep the module antenna region outside copper/enclosure obstructions.

Revision A selects ESP32-S3-WROOM-1-N8R8 after comparison with ESP32-S3-MINI-1-N8. The WROOM variant provides 8 MB flash and 8 MB PSRAM, native USB on GPIO19/GPIO20, official KiCad library support, and a less dense assembly footprint. See parts-selection.md for datasheet citations, sourcing limits, and the +65 °C normal operating limit of the…

Main components on the Quiet trace

ESP32-S3-WROOM-1-N8R8AP2112K-3.3TRG1USBLC6-2SC6ICS-43434

Quiet trace bill of materials (BOM)

24 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-S3-WROOM-1-N8R8
Espressif Systems
U1
1
AP2112K-3.3TRG1
Diodes Incorporated
U2
1
USBLC6-2SC6
STMicroelectronics
U3
1
ICS-43434
TDK InvenSense
U4
1
USB4105-GF-A
GCT
J1
1
M20-9990645
DEBUG_RECOVERY
Harwin
J2
1
BSMD1206-050-16V
500mA hold / 1A trip
BHFUSE
F1
1
KMR221GLFS
RESET
C&K
SW1
1
KMR221GLFS
SETUP_MARK_BOOT
C&K
SW2
1
LTST-C170KGKT
STATUS_YELLOW_GREEN
Lite-On
D1
1
PESD5V0S1BA,115
PESD5V0S1BA
Nexperia
D2
2
TCC0603X7R475K100CT
4.7uF 10V X7R
CCTC
C1, C2
1
GRM21BR71A106KE51L
10uF 10V X7R
Murata Electronics
C3
2
GRM188R71C104KA01D
100nF 16V X7R
Murata Electronics
C4, C5
2
0603WAF5101T5E
5.1k
UniOhm
R1, R2
2
0603WAF220JT5E
22R
UniOhm
R3, R4
2
0603WAF1002T5E
10k
UniOhm
R5, R6
1
0603WAF1001T5E
1k
UniOhm
R7
1
0603WAF1003T5E
100k
UniOhm
R8

Quiet trace design files

The KiCad project lives in the rwrife/quiet-trace repository on GitHub; these links point at the commit this page was built from.

Quiet trace: common questions

What microcontroller does the Quiet trace use?

The Quiet trace is built around the ESP32-S3-WROOM-1-N8R8, from the ESP32 family.

How big is the Quiet trace PCB?

The Quiet trace measures 80 × 52 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Quiet trace?

24 components, from 19 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Quiet trace design files?

From the rwrife/quiet-trace repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Quiet trace design in my own project?

Yes, under the terms of its MIT license, which rwrife chose for the repository.

Can I test firmware for the Quiet trace without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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