BREATH ISTHE INTERFACE.

L.I.P.S. — Open-source. Built by hand. Changes lives.

SCROLL
What it does

Full computer control.
One breath at a time.

L.I.P.S. is a USB sip-and-puff interface for people with paralysis. An analog joystick moves the cursor; sip and puff trigger fully configurable actions — clicks, keystrokes, or scroll. No drivers, no configuration wizard. Plug in and go — then customize everything.

“The difference between dependent and independent is eight milliseconds.”
The Lineup
1× + joystick
Pressure Sensors
USB HID
Protocol
CH552G
MCU
128 B
EEPROM
L.I.P.S. SINGLE
Single

One sensor. Puff fires a left click, sip fires a right click — baked into firmware, no configurator involved. The joystick drives the cursor. Fewest parts, simplest build, lowest cost. The right choice for a first device.

SENSORS1× pressure + joystick
PROTOCOLUSB HID
MCUCH552G, 24 MHz
EEPROM128 B internal
ENCLOSURE3D-printed PLA / Resin
CONNECTIONUSB-C
Development History
“Version 1 didn't work.
Version 2 never made it to production.
Version 4.2 — built for anyone who needs it.”
ORIGINSummer 2025

A Challenge, a Video, a Decision

A Sofia municipality event needed a project. I saw that sip-and-puff devices cost $1,500 — and decided to change that. LIPS was born.

V1.02025

Version 1 Didn't Work

Played it safe with familiar parts. The result was big, chunky, barely functional — but enough to keep going.

V2.02025

Too Complex to Manufacture

Professor input shaped V2. Hours before ordering, a fatal flaw: the sensor wasn't differential. Scrapped.

V3.x2025–2026

Down the Rabbit Hole

New goal: cheap, small, solderable by anyone. Datasheets, niche suppliers, a PCBWay run. Firmware too hardware-specific for AI — wrote it from scratch.

V4.22026

Shell, Web, Ship

Resin over FDM — night and day. Web platform for flashing and configuring without touching code. Squeezed into the CH552 after weeks of optimization.

Background
The device that costs less than dinner - but returns a life.
The Alternative
$1,500

Current commercial sip-and-puff devices on the market. Proprietary. Repair-dependent. Out of reach for most families.

L.I.P.S.
~$20
FULL DIY
~$70
MANAGED BUILD

Open hardware. Fully repairable. Every schematic, file, and line of firmware is yours — forever.

Prices shown are for the single-sensor version. The Dual and Plus variants cost more.

Start building →
Keep it going

Help it reach
more hands.

L.I.P.S. is free, open, and always will be. But certification costs money — and a certified device means no soldering iron required. One contribution brings us one step closer to a version anyone can order and use out of the box.

Support on Ko-fi