> ## Documentation Index
> Fetch the complete documentation index at: https://docs.omi.me/llms.txt
> Use this file to discover all available pages before exploring further.

# Assembly & BOM

> 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:**

* [CSV format](https://github.com/BasedHardware/omi/blob/main/omi/hardware/consumer/bom/omi-bom.csv)
* [XLSX format](https://github.com/BasedHardware/omi/blob/main/omi/hardware/consumer/bom/omi-bom.xlsx)

### 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.

<Tip>
  **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.
</Tip>

***

## Assembly Reference

### Exploded View

<Frame caption="Complete Omi Consumer — all components identified">
  <img src="https://raw.githubusercontent.com/BasedHardware/omi/main/omi/hardware/consumer/assembly/photos/materials-labelled-exploded-view.jpg" />
</Frame>

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

<Tabs>
  <Tab title="Core Assembly" icon="screwdriver-wrench">
    <Steps>
      <Step title="Prepare workspace">
        <Frame caption="All components laid out before assembly">
          <img src="https://raw.githubusercontent.com/BasedHardware/omi/main/omi/hardware/consumer/assembly/photos/components-disassembled.jpg" />
        </Frame>

        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>
      </Step>
    </Steps>
  </Tab>

  <Tab title="Packaging & QA" icon="box">
    <Steps>
      <Step title="Final device QA">
        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>
  </Tab>
</Tabs>

### Reference Photos

Assembly photos are in [`assembly/photos/`](https://github.com/BasedHardware/omi/tree/main/omi/hardware/consumer/assembly/photos):

* [`materials-labelled-exploded-view.jpg`](https://github.com/BasedHardware/omi/blob/main/omi/hardware/consumer/assembly/photos/materials-labelled-exploded-view.jpg) — All components identified
* [`materials-labelled.jpg`](https://github.com/BasedHardware/omi/blob/main/omi/hardware/consumer/assembly/photos/materials-labelled.jpg) — Materials and finish callouts
* [`components-disassembled.jpg`](https://github.com/BasedHardware/omi/blob/main/omi/hardware/consumer/assembly/photos/components-disassembled.jpg) — Individual components laid out
* [`outer-aluminium-covers.jpg`](https://github.com/BasedHardware/omi/blob/main/omi/hardware/consumer/assembly/photos/outer-aluminium-covers.jpg) — CNC aluminium cover detail

### 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.

```bash theme={null}
cd omi/hardware/consumer
sha256sum -c checksums.sha256
```

<Card title="View Checksums" icon="fingerprint" href="https://github.com/BasedHardware/omi/blob/main/omi/hardware/consumer/checksums.sha256">
  SHA-256 checksums for all 58 design files (ZIP, STEP, PDF, BOM, images)
</Card>