141 lines
6.0 KiB
Markdown
141 lines
6.0 KiB
Markdown
---
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title: HBOX Watchdog v3 PROD — Assembly BOM Split
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project: Project Drogheda
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date: 2026-07-05
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tags: [project-drogheda, hardware, pcb, assembly, jlcpcb, bom]
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status: Board routed, DRC fab-clean — assembly reference for JLCPCB PCBA order
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---
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# HBOX Watchdog v3 PROD — Assembly BOM Split
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Audit of the routed board (`kicad/hbox-watchdog-v3-PROD.kicad_pcb`, 126 footprints)
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for the JLCPCB assembly order. Three buckets: **(A)** what JLC solders onto the
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board, **(B)** the plug-in modules that sit on top (you install), and **(C)** what
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lives off-board and connects through the JST harness.
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| Bucket | Count | JLC assembles? |
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|---|---|---|
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| A. On-board parts (SMD + THT) | 103 parts + 12 connectors + 5 sockets | **Yes** |
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| B. Plug-in modules (on top) | 3 modules | No — you install |
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| C. External via JST harness | wired to 12 connectors | No — off-board |
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| Fab features (2 test points, 4 mounting holes) | 6 | n/a |
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---
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## A. Assembled by JLC — on the PCB
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### A1 · SMD parts (standard PCBA — 98 parts)
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| Qty | Value | Package | Refs |
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|---|---|---|---|
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| 10 | 10k | R0603 | R2, R5, R6, R7, R8, R41, Rigb, Rled, Rrp, Rtp |
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| 8 | 100k | R0603 | R20, R56, R57, R58, Ren1, Rfreq, Rfreq2, Rgs |
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| 7 | 100nF | C0603 | C5, C7, C9, C11, C24, Cu3, Cu4 |
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| 5 | LED | LED0805 | D1, DB1, DB2, DB3, DB4 |
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| 4 | 1k | R0603 | R1, R3, R40, Rts |
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| 4 | 330R | R0603 | RB1, RB2, RB3, RB4 |
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| 3 | SS34 | D_SMA | D2, Dbk, Dbk2 |
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| 3 | 22uF | C0805 | C35, C40, C41 |
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| 3 | 100k/1% | R0603 | R52, R54, R60 |
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| 2 | MP1584EN | SOIC-8-EP | U2 (fan buck), U7 (modem buck) |
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| 2 | 2.2nF | C0603 | Ccomp, Ccomp2 |
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| 2 | 100R | R0603 | Rg, Rig |
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| 2 | 10uF | C0805 | C30, C34 |
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| 2 | 4.7k | R0603 | R30, R31 |
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| 2 | 40.2k | R0603 | Rcomp, Rcomp2 |
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| 2 | MMBT3904 | SOT-23 | Q5, Q6 |
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| 2 | 10nF | C0603 | Cbst, Cbst2 |
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| 2 | AO3400A | SOT-23 | Q2, Q4 |
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| 2 | 10k/1% | R0603 | R42, R55 |
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| 2 | 47uF | C1210 | C32, C33 |
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| 1 | **LTC4040EUFD** | QFN-24 | U6 (backup-supply/charger) |
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| 1 | AO4406A | SOIC-8 | Q7 |
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| 1 | AO3401A | SOT-23 | Q1 |
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| 1 | IRFR5305 | TO-252 | Q10 |
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| 1 | BZX84C15 | SOT-23 | DzG |
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| 1 | BAT54 | SOD-123 | D5 |
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| 1 | 1N4148W | SOD-123 | D6 |
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| 1 | SMBJ33A | D_SMB | D10 |
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| 1 | **SHT40-AD1B** | DFN-4 | U3 (humidity/temp) |
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| 1 | **TMP102** | SOT-563 | U4 (temp) |
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| 1 | 8mR/1% | R1206 | RS1 (current sense) |
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| 1 | PPTC 3A | Fuse1812 | F1 |
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| 3 | 2.2uH / 10uH / 10uH-2A | SRU8028 8×8 | L6, L2, L7 |
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| 1 | 22uF/50V | C1210 | C22 |
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| 1 | 22uF/16V | C0805 | C23 |
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| 1 | 2.2uF | C0603 | C31 |
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| — | *(single-value R's)* | R0603 | Ren2 20k, Rdfu 22k, R21 19.1k, R50 825R, R51 287k, R53 499k, R61 31.6k |
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| 4 | jumpers | SolderJumper | JP1 (0R), JP2 (F2), JP3 (F1), JP4 (F0) |
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### A2 · Through-hole parts (THT — JLC "through-hole assembly" surcharge, or hand-solder)
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| Ref | Part | Note |
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|---|---|---|
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| K1 | Omron G5V-1 DC5 relay | Modo-B fail-safe bypass |
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| SW1 | 6 mm push (RESET) | |
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| C3, C10, C43 | Radial electrolytics (47µF, 47µF/50V, 100µF) | |
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### A3 · Connectors & module sockets (THT — soldered to board)
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| Ref | Part | Purpose |
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|---|---|---|
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| P1 | Phoenix MKDS 1.5-5 (5-pos terminal) | GX16 machine power in |
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| P2, P8, P10, P11, P12 | JST-XH 2-pin | see bucket C |
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| P4, P13 | JST-XH 3-pin | |
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| P3, P5, P6 | JST-XH 4-pin | |
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| H3 | 1×3 pin header | USART1 reserved |
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| **J1, J2** | 1×20 female 2.54 | **Blackpill socket** |
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| **J7, J8** | 1×10 female 2.00 | **4G XBee socket** |
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| **MOD1** | Arduino-UNO-form female headers | **simpleRTK2B Pro socket** |
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> ⚠️ **Confirm before ordering:** engineering notes flag **P3 / P13 / H3 as DNP**
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> (Modo-B + K1 NC bypass makes them redundant), but they are **not** marked DNP in
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> the board file — so JLC would populate them. Decide per-connector.
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---
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## B. Plug-in modules — mounted ON TOP (you install, NOT in the JLC order)
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These are complete boards that seat into the sockets above. Do **not** add them to
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the JLC BOM — they're hand-fitted after the PCBA arrives.
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| Module | Seats into | Notes |
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|---|---|---|
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| **simpleRTK2B Pro** (ZED-F9P) | MOD1 (Arduino headers) | GNSS RTK receiver |
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| **STM32F411 Blackpill** | J1 + J2 (2×20) | watchdog MCU |
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| **4G NTRIP Master** (XBee LTE) | J7 + J8 (2×10, 2 mm) | modem, 3V3 socket |
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---
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## C. External — connected via the JST harness (NOT on the board)
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Everything that plugs into the edge connectors and lives outside the HBOX (or in the
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cabinet). Wire per the harness pinout (`harness-connector-pinout.md`).
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| Conn | Wires to (external) | Key pins |
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|---|---|---|
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| **P1** GX16-5 | Machine power + ignition from the cabinet | 1 = 24V_IN ⚡, 3 = IGN_IN, 2 = GND |
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| **P2** 5V-IN | Mean Well SD-15B-05 5 V supply (VEH5V rail) | 1 = VEH5V ⚡, 2 = GND |
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| **P3** RTK2B-UART1 | RTK2B UART1 tap (GNSS TX/RX) | 1 = SW_5V ⚡, 3 = GNSS_TX, 4 = GNSS_RX |
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| **P4** BATT | 1S4P 12 Ah pack + NTC | 1 = BAT_PLUS ⚡, 3 = NTC, 2 = GND |
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| **P5** TEMP_PROBE | External I²C temp/probe header | 1 = 3V3, 3 = SDA, 4 = SCL |
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| **P6** FAN | Cooling fan (5 V, tach) | 1 = 5V_FAN ⚡, 2 = FAN_RET, 4 = TACH |
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| **P8** PANEL_LED | Panel status LED | 1 = LED_A, 2 = LED_K |
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| **P10** RESET-EXT | External reset button | 1 = NRST, 2 = GND |
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| **P11** CUTOFF-SW | Power cutoff switch (SYS→MAIN 5 V) | 1 = MAIN5V ⚡, 2 = SYS5V ⚡ |
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| **P12** NTC-HOTSPOT | Cabinet hotspot NTC | 1 = NTC_TEMP, 2 = GND |
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| **P13** MODO-B-UPLINK | Modo-B uplink to 4G | 1 = USART1_RX, 2 = DIN_4G, 3 = GND |
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---
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## Action items before the JLCPCB order
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1. **Add LCSC part numbers** to the BOM (`fab-jlcpcb/…-BOM.csv`) — it exports value +
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footprint only; JLC PCBA matches on LCSC part #. Watch the odd ones:
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**LTC4040EUFD, SHT40-AD1B, TMP102, MP1584EN, AO4406A, Bourns SRU8028** — verify JLC/LCSC stock.
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2. **Decide THT assembly** — JLC charges extra for through-hole (K1, SW1, C3/C10/C43,
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all connectors/sockets). Common approach: JLC does SMD, you hand-solder the
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connectors + sockets (also avoids paying JLC for the big Phoenix/JST parts).
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3. **Resolve the P3 / P13 / H3 DNP question** above.
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4. Do **not** BOM the three plug-in modules (bucket B).
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