Open Source Hardware - Omi

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.

<Frame caption="Omi Consumer — all components identified"> </Frame> <Info> **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) </Info> <CardGroup cols={2}> <Card title="Electronics" icon="microchip" href="/doc/hardware/consumer/electronics"> PCB schematics, Altium source, Gerber files for mainboard, charger, and FPC </Card> <Card title="Mechanical & Packaging" icon="cube" href="/doc/hardware/consumer/mechanical"> STEP files for enclosure, charger, foam inserts, and packaging </Card> <Card title="Assembly & BOM" icon="screwdriver-wrench" href="/doc/hardware/consumer/assembly"> 88-component BOM with manufacturer part numbers and assembly photos </Card> <Card title="License" icon="scale-balanced" href="/doc/hardware/consumer/license"> MIT license — use, modify, and distribute freely </Card> </CardGroup>

Quick Specs

Component	Specification
Processor	nRF5340 dual-core Bluetooth LE SoC
Wi-Fi	nRF7002 Wi-Fi 6 chip
Audio	2x TDK T5838 top-port PDM microphones
Storage	8GB NAND Flash (CSNP4GCR01)
IMU	LSM6DS3TR-C 6-axis
Battery	3.7V 150mAh LiPo
Charging	BQ25101 charger IC, magnetic pogo pins
Form Factor	25.5mm diameter wearable pendant

Repository Structure

Directory	Contents
`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

Build Journey

<Steps> <Step title="Order PCBs (Week 1)"> Upload Gerber ZIPs to your PCB manufacturer. Order all 3 boards together to save on shipping.

<CardGroup cols={3}>
  <Card title="Mainboard Gerbers" icon="download" href="https://github.com/BasedHardware/omi/tree/main/omi/hardware/consumer/electrical/mainboard/gerbers">
    4-layer FR4, 0.6mm, 21x21mm, ENIG, blind/buried vias
  </Card>
  <Card title="Charger Gerbers" icon="download" href="https://github.com/BasedHardware/omi/tree/main/omi/hardware/consumer/electrical/charger-board/gerbers">
    2-layer FR4, 1.0mm, 13x20mm, ENIG
  </Card>
  <Card title="FPC Gerbers" icon="download" href="https://github.com/BasedHardware/omi/tree/main/omi/hardware/consumer/electrical/fpc-board/gerbers">
    2-layer polyimide, 0.3mm, 29x13mm
  </Card>
</CardGroup>

<Tip>Order 5-10 boards minimum — MOQ is usually 5 and extras cost very little. You'll want spares for rework practice.</Tip>

</Step> <Step title="Source Components (Week 1)"> Use the [BOM CSV](https://github.com/BasedHardware/omi/blob/main/omi/hardware/consumer/bom/omi-bom.csv) to order from distributors. The MPN column has exact manufacturer part numbers.

<Warning>
**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.
</Warning>

<Tip>The 150mAh LiPo battery (D16×H6.1mm) is a custom form factor. Search for "GRP1654M1" or order the closest match and verify dimensions.</Tip>

</Step> <Step title="Manufacture Enclosure (Week 1-2)"> Parts are organized by manufacturing process in [`mechanical/parts/`](https://github.com/BasedHardware/omi/tree/main/omi/hardware/consumer/mechanical/parts).

<Tabs>
  <Tab title="CNC Parts" icon="gears">
    Aluminium covers (Case A + B) and copper touch pins. Send STEP files to a CNC vendor. Minimum order typically 10-50 units.

    <Note>For prototyping, you can 3D print the covers in SLA resin first to verify fit before committing to CNC.</Note>
  </Tab>
  <Tab title="3D Printed Parts" icon="print">
    Frame, LED guide, charger cases, and enhance plate can all be SLA printed. Use white/translucent resin for light guide parts.

    <Tip>If you have an SLA printer (Formlabs, Elegoo), this is the fastest path — print overnight and assemble the next day.</Tip>
  </Tab>
  <Tab title="Injection Molding" icon="fill-drip">
    The wrapper/shell is injection molded in PC+ABS for production. For prototyping, SLA print it instead.

    <Note>Injection molding only makes sense at 500+ units. Below that, SLA or CNC is more economical.</Note>
  </Tab>
</Tabs>

</Step> <Step title="Assemble PCBs (Week 2-3)"> Apply solder paste with stencil, place components, reflow. See the [full assembly guide](/doc/hardware/consumer/assembly).

<Warning>
**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.
</Warning>

</Step> <Step title="Mechanical Assembly"> <Frame caption="Components ready for assembly">

</Frame>

Follow the [assembly reference](/doc/hardware/consumer/assembly) to combine PCB, battery, enclosure, and magnets into the final device.

</Step> <Step title="Flash & Test"> Flash firmware via SWD debug port using a J-Link or nRF DK. Follow the [firmware compilation guide](/doc/developer/firmware/Compile_firmware).

<Check>
**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.
</Check>

</Step> </Steps>