2 layers60 × 30 mm
Controller
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
11 parts3kApache-2.0
2 layers50.9 × 72.5 mm
Spectrogram flex pcb
CCHS-Melbourne/Spectrogram4Spectrogram running MicroPython
- Size
- 50.9 × 72.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 18
- Pads
- 36
- Tracks, vias
- 55, 4
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 16 Mar 2024
- Updated
- 1 Sep 2026
Overview
Spectrogram flex pcb is an open-source printed circuit board by CCHS-Melbourne, from the CCHS-Melbourne/Spectrogram repository on GitHub. It is a 2-layer board of 50.9 × 72.5 mm with 11 parts on 18 nets, routed with 55 tracks and 4 vias.
Its parts include 5 ICs and 3 diodes. It belongs with the lEDs and displays boards of this library.
README
README.md
Spectrogram
It's a 36 LED stack of neopixels joy with an integrated microphone, running MicroPython:
- Audio reactive LEDs
- Acrylic-ready, to show off your creative animations
- Stepped structure to elimate gaps between edge-lit panels
- Touch-enabled to switch between all its range of features
Building
To build the firmware it helps to use mpbuild like so, since this hardware will not work without ulab:
$ git clone https://github.com/mattytrentini/mpbuild && cd mpbuild
$ git clone https://github.com/v923z/micropython-ulab ulab
$ python3 -mvenv .venv && source .venv/bin/activate && pip install -e .
(.venv)$ mpbuild build ESP32_GENERIC_S3 FLASH_4M USER_C_MODULES=$PWD/ulab/code/micropython.cmake allThe resulting object you want to flash with the esptool.py command from the previous section is typically named firmware.bin.
Running
cd software/micropython
./run.shCloseup
Uoooohhh
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | LOGO | LOGO | G***, G***, G*** |
| 3 | ~ | Waveshare_ESP32_S3_mini:Cap touch sensor | U3, U4, U5 |
| 3 | ~ | Waveshare_ESP32_S3_mini:LED strip ghost | D7, D8, D9 |
| 1 | ~ | Waveshare_ESP32_S3_mini:INMP441 | U2 |
| 1 | ~ | Waveshare_ESP32_S3_mini:WS-ESP32-S3-Mini | U1 |
Questions
How big is the Spectrogram flex pcb PCB?
It measures 50.9 × 72.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Spectrogram flex pcb use?
11 parts. 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 Spectrogram flex pcb KiCad files?
From the CCHS-Melbourne/Spectrogram repository on GitHub, at the commit this page was made from: the board is hardware/pcb/Spectrogram flex pcb.kicad_pcb and its schematic hardware/pcb/Spectrogram flex pcb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Spectrogram flex pcb design in my own project?
Its repository states no licence, so its author keeps all rights: ask CCHS-Melbourne before reusing the design.
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