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L.I.P.S.

milar111·L.I.P.S.·pcb/LIPS_V3.2/LIPS_V3.2.kicad_pcb

L.I.P.S. PCB layout, top view — open source WCH CH32/CH55x board by milar111
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About the L.I.P.S. PCB

L.I.P.S. is an open source WCH CH32/CH55x PCB design by milar111, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 38.6 × 15.8 mm, with 17 components from 8 distinct parts.

Its main chip is the CH552G, from the WCH CH32/CH55x family. Other key parts include the USBLC6-2SC6. By type, the board carries 4 test points, 4 capacitors, 3 resistors, 2 ICs, 1 connector and 1 jumper.

It belongs with the sensors designs in this gallery, and the repository also holds 2 earlier revisions of it.

From the project

OpenSource Affordable SipAndPuff device: Linear Interface for Paralysis Support

L.I.P.S. is an open-source assistive device that lets people with limited hand or arm mobility control a computer using sip and puff breath pressure combined with a mini analog joystick. It plugs in over USB and presents itself as a standard keyboard and mouse — no drivers, no software installation, works on any operating system.

L.I.P.S. was designed for people who cannot use a conventional keyboard or mouse. The device reads breath pressure through a silicone mouthpiece, maps each sip and puff gesture to a configurable action (key press, mouse click, or scroll), and maps joystick movement…

L.I.P.S., from the project README
From the project README

Main components on the L.I.P.S.

CH552GUSBLC6-2SC6

L.I.P.S. bill of materials (BOM)

17 components, 8 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
CH552G
U1
1
USBLC6-2SC6
U3
1
USB4085-GF-A_REVB
J1
1
SolderJumper_2_Open
JP1
4
TestPoint
TP1, TP2, TP3, TP4
2
~
XGZP6897A025HPDPN1, XGZP6897A025HPDPN2
4
100NF
100nF
C1, C2, C3, C4
3
5K1
5k1
R1, R4, R5

L.I.P.S. design files

The KiCad project lives in the milar111/L.I.P.S. repository on GitHub; these links point at the commit this page was built from.

L.I.P.S.: common questions

What microcontroller does the L.I.P.S. use?

The L.I.P.S. is built around the CH552G, from the WCH CH32/CH55x family.

How big is the L.I.P.S. PCB?

The L.I.P.S. measures 38.6 × 15.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the L.I.P.S.?

17 components, from 8 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 L.I.P.S. design files?

From the milar111/L.I.P.S. 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 L.I.P.S. design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

Can I test firmware for the L.I.P.S. 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.

Earlier revisions in the repo: LIPS_V3.1, LIPS_V3

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