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Power system docs: Banggood order details #5

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jez merged 2 commits from case-design-doc into main 2026-06-03 20:30:21 +00:00
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20
README.md
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@ -11,8 +11,8 @@ A cyberdeck built from salvaged ASUS K501U laptop components and Orange Pi 3B SB
- [x] Display identified — eDP controller board ordered ($35)
- [x] SBC: Orange Pi 3B 8GB/256GB — purchased and delivered
- [x] **SBC boot from eMMC — verified** (Orange Pi OS, 3-OS partition layout, multi-boot ready)
- [ ] Display controller board — awaiting delivery (~2 weeks)
- [ ] Power system — board selection and cell testing
- [x] Display controller board — awaiting delivery (~2 weeks)
- [x] Power system — Banggood board + cells + amp ordered Jun 3
- [ ] Case fabrication
- [ ] Full assembly and software configuration
@ -80,11 +80,13 @@ A cyberdeck built from salvaged ASUS K501U laptop components and Orange Pi 3B SB
| Category | Cost |
|----------|------|
| SBC (w/ 256GB eMMC, WiFi+BT) | $189 |
| Display controller | ~$24 |
| Storage (hub + enclosure) | ~$30 |
| Power system (board + cells + fuse + charger) | ~$44 |
| HDMI switch + panel cables + SD reader | ~$33 |
| **Subtotal** | **~$320** |
|| SBC (w/ 256GB eMMC, WiFi+BT) | $189 |
|| Display controller | ~$24 |
|| Storage (hub + enclosure) | ~$30 |
|| Power system (board + cells + holders + fuse) | ~$64 |
|| PAM8403 audio amp | ~$4 |
|| OPi 3B metal case + fan | ~$17 |
|| HDMI switch + panel cables + SD reader | ~$33 |
|| **Subtotal** | **~$361** |
(Excludes case materials and misc hardware. $189 SBC cost is actual after tax/shipping.)
(Excludes case materials and misc hardware. SBC cost is actual after tax/shipping.)

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docs/parts-list.md
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@ -31,16 +31,17 @@
| Item | Specification | Source | Est. Cost | Status |
|------|--------------|--------|-----------|--------|
| IP5389 power board | USB-C PD, 3S, bare PCB | AliExpress | $8-15 | Board model TBD |
| 18650 cells (x6) | 3S2P, matched, 2500-3500mAh | Shopping | $12-30 | To purchase |
| 5A blade fuse + holder | Automotive | Amazon | $2 | To purchase |
|| Banggood power board | QC3.0 3S-5S 65W-100W PD, bare PCB | Banggood (ID 1990904) | $14.39 | **Purchased** — 3S-65W variant |
|| 18650 cells (x6) | 3S2P, matched | Banggood | $48.04 | **Purchased** |
|| Cell holders (x8) | Single 18650 slot | Banggood | $7.99 | **Purchased** (6 + 2 spares) |
|| 5A blade fuse + holder | Automotive | — | $2 | To purchase |
### Audio
| Item | Specification | Source | Est. Cost | Status |
|------|--------------|--------|-----------|--------|
| PAM8403 amp module | 3W+3W, 5V, Class D | Amazon | $3-5 | To purchase |
| 4Ω 3W speakers (x2) | Small drivers, ~31×70mm | Amazon | $5-10 | To purchase |
|| PAM8403 amp module | 3W+3W, 5V, Class D, single turn knob | Banggood | $3.59 | **Purchased** |
|| 4Ω 3W speakers (x2) | Small drivers, ~31×70mm | — | $5-10 | To purchase |
### Networking
@ -71,29 +72,33 @@
| Item | Cost | Status |
|------|------|--------|
| Orange Pi 3B 8GB + 256GB eMMC | $189 | **Purchased** |
| Display controller | $24 | Ordered (may be optional) |
| **Spent so far** | **$213** | |
|| Orange Pi 3B 8GB + 256GB eMMC | $189 | **Purchased** |
|| Display controller | $24 | Ordered (may be optional) |
|| Power board (Banggood 3S-65W) | $14.39 | **Purchased** |
|| 18650 cells (x6) + holders (x8) | $56.03 | **Purchased** |
|| PAM8403 audio amp | $3.59 | **Purchased** |
|| OPi 3B metal case + fan | $16.78 | **Purchased** |
|| **Spent so far** | **$303.79** | |
### Remaining to Purchase
| Category | Cost |
|----------|------|
| Storage (USB enclosure) | ~$12 |
| USB hub (powered 10-port) | ~$22 |
| Power system (board+cells+fuse) | ~$32 |
| Audio (PAM8403 amp + speakers) | ~$10 |
| HDMI switch | ~$10 |
| Panel-mount cables + SD reader | ~$23 |
| **Remaining** | **~$110** |
|| Storage (USB enclosure) | ~$12 |
|| USB hub (powered 10-port) | ~$22 |
|| Power (fuse + misc) | ~$2 |
|| Speakers | ~$8 |
|| HDMI switch | ~$10 |
|| Panel-mount cables + SD reader | ~$23 |
|| **Remaining** | **~$77** |
### Total Project
| | |
|---|----|
| Spent | $213 |
| Remaining | ~$110 |
| **Estimated total** | **~$323** |
|| Spent | $303.79 |
|| Remaining | ~$77 |
|| **Estimated total** | **~$380** |
---
@ -101,21 +106,20 @@
| Item | Date Ordered | Est. Arrival | Source | Tracking |
|------|-------------|--------------|--------|----------|
| Orange Pi 3B 8GB + 256GB eMMC | Before May 24 | Delivered | Amazon | — |
| Display controller board | TBD | 2-4 weeks | Amazon/eBay | TBD |
|| Orange Pi 3B 8GB + 256GB eMMC | Before May 24 | Delivered | Amazon | — |
|| Display controller board | TBD | 2-4 weeks | Amazon/eBay | TBD |
|| Banggood power board + cells + holders + amp + case + fan | Jun 3 | TBD | Banggood | TBD |
## Pending Purchases
- Powered USB hub (10-port USB 3.0)
- USB enclosure or flash drive
- IP5389 power board + 18650 cells
- 5A fuse + holder
- 4Ω 3W speakers (x2)
- Mechanical HDMI A/B switch
- Panel-mount cables (USB-A, USB-C, HDMI, Ethernet, audio)
- Panel-mount SD card reader
- Heatsink for RK3566
- PAM8403 audio amp module
- 4Ω 3W speakers (x2)
---

26
docs/power-system.md
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@ -1,8 +1,20 @@
# Power System
## Decision: IP5389 Power Bank Board (Preliminary)
## Decision: Banggood QC3.0 3S Power Bank Module
All-in-one power management PCB. Replaces separate charger module, BMS, and boost/buck converter with a single board.
All-in-one power management PCB ordered from Banggood. Replaces separate charger module, BMS, and boost/buck converter with a single board. Uses Injoinic IP5389-family chip (likely IP5389H variant based on feature set: bi-dir PD, 3S-5S, digital display, 65-100W).
**Board:** ID 1990904, 3S-65W variant ($14.39)
### Key Specs
- 72×27×6mm board
- USB-C1 (bi-dir PD input/output), USB-C2 (PD output), USB-A1, USB-A2
- 65W max output with 3S pack
- PD3.0/PD2.0, QC3+, QC3.0, AFC, FCP, SCP, VOOC
- Digital tube battery indicator
- Temperature protection
- Passthrough charging (simultaneous charge + discharge)
- 3S-65W (also available: 4S-100W, 5S-100W variants)
## Why This Approach
@ -106,10 +118,10 @@ K501U battery (B31N1429, 4240mAh, 11.4V, 3S) assessed and rejected:
## TODO
- [x] Cell configuration: 3S2P (6 cells, ~300g)
- [ ] Select specific IP5389 board model with verified reviews
- [ ] Source matched 18650 cells (Samsung 35E, LG MJ1, or equivalent)
- [ ] Verify passthrough charging on selected board
- [ ] Select PAM8403 audio amp module + small 4Ω speakers
- [x] Select and order board — Banggood ID 1990904, 3S-65W
- [x] Source matched 18650 cells — ordered via Banggood
- [x] Select PAM8403 audio amp — ordered via Banggood
- [ ] Verify passthrough charging on board once received
- [ ] Select powered USB hub with 5V DC barrel input (not AC wall wart)
- [ ] Order board + cells + amp + hub
- [ ] Order 5A blade fuse + holder
- [ ] Test charging and output before case integration