HardLabs

Spectrum analyzer

JadenS180·spectrum-analyzer·hardware/spectrum_analyzer.kicad_pcb

Spectrum analyzer PCB layout, top view — open source ESP32 board by JadenS180

About the Spectrum analyzer PCB

Spectrum analyzer is an open source ESP32 PCB design by JadenS180, published on GitHub under the MIT license. It is a 2-layer board measuring 74.9 × 100.3 mm, with 11 components from 8 distinct parts.

Its main chip is the ESP32-WROOM-32, from the ESP32 family. Other key parts include the AMS1117-3.3 and ER_OLEDM0.91_1x-I2C. By type, the board carries 3 ICs, 3 capacitors, 3 resistors and 2 connectors.

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

From the project

ESP32-based real-time audio spectrum analyzer with custom PCB design. Features INMP441 I2S microphone, SSD1306 OLED display, FFT processing, and real-time WiFi streaming to a browser-based visualizer via WebSockets.

A real-time audio spectrum analyzer built on the ESP32, featuring a custom-designed PCB. Captures audio via an I2S MEMS microphone, runs FFT processing on-chip, displays a live 16-bar frequency spectrum on an OLED display, and streams real-time FFT data over WiFi to a browser-based visualizer via WebSockets.

https://github.com/JadenS180/spectrum-analyzer/raw/main/media/spectrum-DemoNoise.MOV

Spectrum analyzer, from the project README
From the project README

Main components on the Spectrum analyzer

AMS1117-3.3ESP32-WROOM-32ER_OLEDM0.91_1x-I2C

Spectrum analyzer bill of materials (BOM)

11 components, 8 distinct parts.

QtyPartRefs
1
AMS1117-3.3
U1
1
ESP32-WROOM-32
U2
1
ER_OLEDM0.91_1x-I2C
U3
1
INMP441
J1
1
USB_C_Receptacle_USB2.0_16P
J2
3
100n
C1, C2, C3
1
10k
R1
2
5.1k
R2, R3

Spectrum analyzer design files

The KiCad project lives in the JadenS180/spectrum-analyzer repository on GitHub; these links point at the commit this page was built from.

Spectrum analyzer: common questions

What microcontroller does the Spectrum analyzer use?

The Spectrum analyzer is built around the ESP32-WROOM-32, from the ESP32 family.

How big is the Spectrum analyzer PCB?

The Spectrum analyzer measures 74.9 × 100.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Spectrum analyzer?

11 components, from 8 distinct parts. The full bill of materials is listed on this page.

Where can I download the Spectrum analyzer design files?

From the JadenS180/spectrum-analyzer repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Spectrum analyzer design in my own project?

Yes, under the terms of its MIT license, which JadenS180 chose for the repository.

Can I test firmware for the Spectrum analyzer 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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