HardLabs

Oso75

vamshikrishnaramasamy·oso-keyboard·hardware/kicad/oso75/oso75.kicad_pcb

Oso75 PCB layout, top view — open source ESP32 board by vamshikrishnaramasamy

About the Oso75 PCB

Oso75 is an open source ESP32 PCB design by vamshikrishnaramasamy, published on GitHub under the MIT license. It is a 2-layer board measuring 337.1 × 150.1 mm, with 179 components from 11 distinct parts.

Its main chip is the ESP32-S3-WROOM-1U-N16, from the ESP32 family. Other key parts include the AP2112K-3.3. By type, the board carries 82 switches, 82 diodes, 7 resistors, 4 capacitors, 2 ICs and 1 connector.

It belongs with the keyboards designs in this gallery.

From the project

Generated from hardware/layout/oso75.layout.json and the PCB circuit netlists, then hand-finished for fabrication. Do not re-run scripts/generate-kicad.mjs over this board - it would clobber the routing and the real footprints below.

Generated from hardware/layout/oso75.layout.json and the PCB circuit netlists, then hand-finished for fabrication. Do not re-run scripts/generate-kicad.mjs over this board - it would clobber the routing and the real footprints below.

Open oso75.kicadpro` in KiCad 10. The board contains:

- 82 Kailh MX hotswap switch footprints (cloned from the proven annovax75 reference board: 3.05 mm plated contact holes, 4.0 mm center / 1.75 mm fixation NPTH, F.Cu SMD socket pads); Esc and F1 are replaced by the module bay - 82 SOD-123 diode footprints, 6 x 16 COL2ROW matrix - ESP32-S3-WROOM-1U-N16 module…

Main components on the Oso75

ESP32-S3-WROOM-1U-N16AP2112K-3.3

Oso75 bill of materials (BOM)

179 components, 11 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-S3-WROOM-1U-N16
U1
1
AP2112K-3.3
U3
1
USB_C_HRO_TYPE-C-31-M-12
J1
1
0603L050SLYR
F1
82
MX_Hotswap
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +74
82
1N4148W
D1, D2, D3, D4, D5, D6, D7, D8 +74
2
10uF
C1, C2
2
100NF
100nF
C3, C4
2
5.1K
5.1k
R1, R2
2
27R
R3, R4
3
10K
10k
R5, R6, R10

Oso75 design files

The KiCad project lives in the vamshikrishnaramasamy/oso-keyboard repository on GitHub; these links point at the commit this page was built from.

Oso75: common questions

What microcontroller does the Oso75 use?

The Oso75 is built around the ESP32-S3-WROOM-1U-N16, from the ESP32 family.

How big is the Oso75 PCB?

The Oso75 measures 337.1 × 150.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Oso75?

179 components, from 11 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 Oso75 design files?

From the vamshikrishnaramasamy/oso-keyboard 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 Oso75 design in my own project?

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

Can I test firmware for the Oso75 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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