Skip to content

assembly.mdx

Latest commit

 

History

History
165 lines (132 loc) · 7.36 KB

assembly.mdx

File metadata and controls

165 lines (132 loc) · 7.36 KB
Raw
title Assembly & BOM
icon hammer
description Bill of Materials and assembly reference for building the Omi from components.

Bill of Materials

The BOM contains 88 components across the mainboard, charger board, FPC, and mechanical assembly.

Download:

Key Components

Component MPN Manufacturer Qty
Main SoC nRF5340-CLAA Nordic Semiconductor 1
Wi-Fi IC nRF7002-CEAA-R7 Nordic Semiconductor 1
Microphones MMICT5838-00-012 TDK 2
8GB NAND Flash CSNP4GCR01-DPW CS 1
6-axis IMU LSM6DS3TR-C STMicroelectronics 1
Battery Charger BQ25101YFPR Texas Instruments 1
DC-DC Buck TPS628438YKAR Texas Instruments 1
Load Switch TPS22916CYFPR Texas Instruments 2
RF Switch FM8625H FUMAN 1
LDO 3.3V SGM2036S-3.3XXDH4G/TR SGMICRO 1
LDO 1.8V SGM2036S-1.8XXDH4G/TR SGMICRO 1
Crystal 40MHz CJ17-400001010B20 CJ 1
Crystal 32MHz 1S32000049 Faith Long 1
Crystal 32.768KHz DST1610A KDS 1
Battery GRP1654M1-1C-1S1P-3.7V-150mAh GERUIPU 1
Vibration Motor LBM0525A4123F LIDEWEI 1
RGB LED MHPA0606RGBDT MEIHUA 2
Pogo Pins (device) CA02-PG07 JINLANTIAN 6
Pogo Pins (charger) CA62-PG308 JINLANTIAN 2
Tactile Button TS-1001S JINBEILI 1

Passive Components

The mainboard uses 0201-size passives (resistors, capacitors) primarily from YAGEO and Murata. See the full BOM CSV for complete listings including designators.

**Sourcing tip for indie makers:** Order passives (0201 resistors/capacitors) from LCSC — they have the best prices and ship from China alongside your JLCPCB boards. For active ICs, Mouser/DigiKey have more reliable stock.

Assembly Reference

Exploded View

The device consists of these main assemblies:

  1. Front aluminium cover (CNC machined)
  2. LED light guide (SLA/translucent)
  3. Main frame (SLA/translucent PC+ABS)
  4. PCB mainboard with microphones, SoC, flash
  5. FPC connecting to charging contacts
  6. Battery (150mAh LiPo)
  7. Vibration motor
  8. Silicone pad
  9. Back aluminium cover (CNC machined)

Build Guide

    Lay out all components on an anti-static mat. You'll need: tweezers, Phillips screwdriver (PH000), UV lamp, multimeter, and S300 adhesive.
  </Step>
  <Step title="Install PCB into frame">
    Place the mainboard PCB into the SLA frame on the mounting posts. Board should sit flat with no rocking. Connect the FPC cable to the board-to-board connector.

    <Warning>The FPC connector is fragile — lift the latch before inserting, then press down firmly to lock. Do not force it.</Warning>
  </Step>
  <Step title="Connect battery and motor">
    Plug in the 150mAh LiPo battery. Route the cable to avoid pinching. Attach the vibration motor with double-sided tape.

    <Warning>**Battery polarity is critical.** Reversed polarity will destroy the BQ25101 charger IC and may cause thermal runaway. Verify polarity with a multimeter before connecting.</Warning>
  </Step>
  <Step title="Install magnets and silicone pad">
    Apply UV adhesive to magnet seats. Insert 4x N52 magnets (D3×H3mm). Cure with UV lamp for 30 seconds each.

    <Warning>Test magnet polarity against the charger dock BEFORE gluing. Mark each magnet with a Sharpie. Once cured, they cannot be removed.</Warning>

    Place the silicone pad over the battery/motor assembly.
  </Step>
  <Step title="Close enclosure">
    Attach aluminium covers (Case A front, Case B back). Secure with 3x Phillips screws (CM1.2×5). Apply S300 glue around the seam.

    <Check>Before sealing: test charging contact continuity, verify BLE advertising, confirm both mics record audio.</Check>

    {/* WIP: Need a photo showing the actual enclosure-closing process (covers being mated, screws being inserted). @aarav */}
  </Step>
</Steps>
Power on the device and run through the verification checklist: - BLE advertising visible in nRF Connect - Both microphones recording (test with firmware audio loopback) - Wi-Fi scanning networks - IMU reporting orientation changes - LED cycling RGB colors - Charger dock making contact and charging 
    <Check>All 6 checks must pass before packaging.</Check>
  </Step>
  <Step title="Package the device">
    Place device in foam insert, close the packaging case. The foam inserts protect the device during shipping.

    <Tip>Packaging STEP files are in [`packaging/cad/`](https://github.com/BasedHardware/omi/tree/main/omi/hardware/consumer/packaging/cad) if you want to manufacture custom retail packaging.</Tip>
  </Step>
</Steps>

Reference Photos

Assembly photos are in assembly/photos/:

Additional Mechanical Parts

Part Specification Qty
Dust filter 5.8x4.0x0.1mm 2
Double-sided tape (small) D4xd1.5xH0.1mm 2
Double-sided tape (large) 14x12.5x0.1mm 1
Phillips screws CM1.2x5 3
N52 magnets D3xH3mm 4
Light pipe PC, D6xH1.9mm (custom) 1
S300 glue 20g/pcs 1
UV glue DDY6203_6 1
Necklace rope 2.5mm, L650mm 1
Protection cover 28.7x35.5x11mm (molded) 1

File Integrity

All design files include SHA-256 checksums for verification against the original source files.

cd omi/hardware/consumer
sha256sum -c checksums.sha256
SHA-256 checksums for all 58 design files (ZIP, STEP, PDF, BOM, images)