# Calarin order sheet — 2026-04-12

## Use this source of truth
For ordering, trust the verified KiCad/review pack over older narrative spec text.

Verified safe-now core parts from the review pack:
- ESP32-S3-WROOM-1U-N16R8
- MSM261DGT003
- W25Q128JVSIQ
- ME6210A33M3G
- WS2812B-V5
- IP5306-I2C
- USB-C / switch / passives / headers as represented in the clean schematic set

Important note:
- some older spec prose still mentions different earlier candidates
- if there is any disagreement, the clean schematic / review pack wins

## Recommended immediate order
### Batteries
1. Ecocell 302540 LiPo 250mAh — 4 units
- product direction battery
- https://ecocell.com.au/product/lipo-250-302540/

2. PMD Way 402030 LiPo 200mAh — 2 units
- bring-up hedge only
- https://pmdway.com/products/lithium-ion-polymer-battery-3-7v-200mah-402030

### Core board parts
3. ESP32-S3-WROOM-1U-N16R8 — 8 units
4. MSM261DGT003 — 10 units
5. W25Q128JVSIQ — 10 units
6. ME6210A33M3G — 10 units
7. WS2812B-V5 — 15 units
8. IP5306-I2C — 10 units
9. USB-C connector matching schematic footprint — 10 units
10. Tactile switch matching schematic footprint — 15 units
11. Programming/header connector sets — 10 sets

### Passives / support parts
12. All resistor values used in schematic — 20 to 50 each
13. All capacitor values used in schematic — 20 to 50 each
14. JST adapters / battery mating harnesses as needed — 10
15. MagSafe magnet/ring samples for fit testing — 5 to 10

## Ordering tiers
### Tier 1 — place now
- Ecocell 302540
- PMD 402030
- ESP32-S3-WROOM-1U-N16R8
- MSM261DGT003
- W25Q128JVSIQ
- ME6210A33M3G
- WS2812B-V5
- IP5306-I2C

### Tier 2 — place with board assembly order
- USB-C connector
- tactile switch
- programming headers
- passives

### Tier 3 — convenience / mechanical hedge
- extra 302540 from 99Tech if desired
- MagSafe ring samples
- enclosure prototype materials

## How to avoid ordering the wrong tiny parts
Before submitting the full passives/electromechanical cart:
1. export the exact BOM from the clean KiCad project
2. use the footprint/package from the clean schematic/project, not old markdown text
3. then fill in USB-C / switch / passive line items from that BOM

## My literal recommendation
If you want the shortest correct move today:
- order the two battery classes now
- order the eight core silicon/electrical line items now
- then do the exact BOM export for passives/connectors before finalizing the rest

That gets momentum without pretending the stale textual BOM is perfect.