HardLabs

PS-OHK Control Board

blueOkiris·ps-ohk·ctrl/ctrl.kicad_pcb

PS-OHK Control Board layout, top view — open source WCH CH32/CH55x board by blueOkiris
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About the PS-OHK Control Board

PS-OHK Control Board is an open source WCH CH32/CH55x PCB design by blueOkiris, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 65 × 114 mm, with 17 components from 9 distinct parts.

Its main chip is the SOIC-16_3.9x9.9mm_Pitch1.27mm, from the WCH CH32/CH55x family. By type, the board carries 4 connectors and 2 capacitors.

It belongs with the keyboards designs in this gallery.

From the project

Type with only one hand

1) the most common letters used 2) relationships between sounds 3) the shape of a left hand 4) practicality

The PS-OHK (pronounced "psawk" [p͡sɑk̚]) aims to be the ultimate one-handed typing experience all without special modifiers (a standard key count) and a layout that is relatively easy to get used to.

- arduino-cli - make - sdcc - ch55xtool - libusb

Hold program button down, plug in, let go of program button, and run make -C fw upload within 3 seconds

PS-OHK Control Board, from the project README
From the project README

PS-OHK Control Board bill of materials (BOM)

17 components, 9 distinct parts — part numbers from the project's BOM.

QtyPartRefs
4
Conn_01x20
J1, J2, J3, J4
2
PCA9505DGGY
~
IC_IOEXP1, IC_IOEXP2
1
~
IC_MCU1
1
~
J_USB1
3
1-10k
R_ADDR1, R_I2C1, R_I2C2
2
5.1k
R_CC1, R_CC2
1
10k
R_PROG1
1
~
SW_PROG1
2
100NF
100nF
C1, C2

PS-OHK Control Board design files

The KiCad project lives in the blueOkiris/ps-ohk repository on GitHub; these links point at the commit this page was built from.

PS-OHK Control Board: common questions

What microcontroller does the PS-OHK Control Board use?

The PS-OHK Control Board is built around the SOIC-16_3.9x9.9mm_Pitch1.27mm, from the WCH CH32/CH55x family.

How big is the PS-OHK Control Board?

The PS-OHK Control Board measures 65 × 114 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the PS-OHK Control Board?

17 components, from 9 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 PS-OHK Control Board design files?

From the blueOkiris/ps-ohk 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 PS-OHK Control Board design in my own project?

Yes, under the terms of its GPL-3.0 license, which blueOkiris chose for the repository.

Can I test firmware for the PS-OHK Control Board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug WCH CH32/CH55x firmware against it before you order a PCB.

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