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Omi Consumer Open Source Hardware

The Omi Consumer is fully open source. All design files needed to study, modify, manufacture, and sell the hardware are available under the MIT license.
What you’ll need to build an Omi:
  • Tools: Soldering station with hot air, solder paste + stencils, multimeter, tweezers, UV lamp (for adhesive)
  • Software: KiCad or Altium (PCB), FreeCAD or Fusion 360 (mechanical), nRF Connect SDK (firmware)
  • Accounts: PCB fabricator (JLCPCB/PCBWay), component distributor (Mouser/DigiKey/LCSC)
  • Skills: SMT soldering (QFN packages), basic mechanical assembly, firmware flashing via SWD
  • Budget: ~$30-50 per unit in small quantities (PCBs + components + enclosure, excluding tools)
  • Time: 2-3 weeks (PCB fabrication) + 1-2 hours (assembly per unit)

Electronics

PCB schematics, Altium source, Gerber files for mainboard, charger, and FPC

Mechanical & Packaging

STEP files for enclosure, charger, foam inserts, and packaging

Assembly & BOM

88-component BOM with manufacturer part numbers and assembly photos

License

MIT license — use, modify, and distribute freely

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Quick Specs

ComponentSpecification
ProcessornRF5340 dual-core Bluetooth LE SoC
Wi-FinRF7002 Wi-Fi 6 chip
Audio2x TDK T5838 top-port PDM microphones
Storage8GB NAND Flash (CSNP4GCR01)
IMULSM6DS3TR-C 6-axis
Battery3.7V 150mAh LiPo
ChargingBQ25101 charger IC, magnetic pogo pins
Form Factor25.5mm diameter wearable pendant

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Repository Structure

DirectoryContents
electrical/PCB design files
electrical/mainboard/nRF5340 + nRF7002 main board
electrical/charger-board/Magnetic charger dock
electrical/fpc-board/Flexible printed circuit
bom/Bill of Materials (CSV + XLSX)
mechanical/Enclosure & parts (STEP files)
mechanical/assemblies/Full device + charger assembly
mechanical/parts/Individual parts by process
mechanical/drawings/2D technical drawings
assembly/Assembly photos & instructions
packaging/Retail packaging CAD & photos

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Build Journey

1

Order PCBs (Week 1)

Upload Gerber ZIPs to your PCB manufacturer. Order all 3 boards together to save on shipping.

Mainboard Gerbers

4-layer FR4, 0.6mm, 21x21mm, ENIG, blind/buried vias

Charger Gerbers

2-layer FR4, 1.0mm, 13x20mm, ENIG

FPC Gerbers

2-layer polyimide, 0.3mm, 29x13mm
Order 5-10 boards minimum — MOQ is usually 5 and extras cost very little. You’ll want spares for rework practice.
2

Source Components (Week 1)

Use the BOM CSV to order from distributors. The MPN column has exact manufacturer part numbers.
Long-lead items to order first: nRF5340-CLAA (SoC), nRF7002-CEAA-R7 (Wi-Fi), CSNP4GCR01-DPW (8GB Flash). These can take 2-4 weeks from Mouser/DigiKey. Check LCSC for faster China-based shipping.
The 150mAh LiPo battery (D16×H6.1mm) is a custom form factor. Search for “GRP1654M1” or order the closest match and verify dimensions.
3

Manufacture Enclosure (Week 1-2)

Parts are organized by manufacturing process in mechanical/parts/.
Aluminium covers (Case A + B) and copper touch pins. Send STEP files to a CNC vendor. Minimum order typically 10-50 units.
For prototyping, you can 3D print the covers in SLA resin first to verify fit before committing to CNC.
4

Assemble PCBs (Week 2-3)

Apply solder paste with stencil, place components, reflow. See the full assembly guide.
Critical: The nRF5340 (WLCSP-95, 4.4x4.0mm) and nRF7002 (WLCSP-81, 3.75x3.4mm) are fine-pitch wafer-level packages. You MUST use solder paste + stencil + reflow (hot air or oven). Do not attempt hand soldering these ICs.
5

Mechanical Assembly

Follow the assembly reference to combine PCB, battery, enclosure, and magnets into the final device.
6

Flash & Test

Flash firmware via SWD debug port using a J-Link or nRF DK. Follow the firmware compilation guide.
Verification checklist: BLE advertising visible in nRF Connect app, both microphones recording audio, Wi-Fi scanning networks, IMU reporting orientation, LED cycling RGB, charger detecting dock contact.