B W Master

B-W_Master_Slave_RF

Master_Slave_RF — a one-way 433.92 MHz ASK/OOK wireless link designed for B-W Technology Company. PCB design project in KiCad 9, tracked on the IoT PM dashboard as MSRF-1.0.

A remote Slave node transmits an ASK/OOK code at 433.92 MHz to a mains-powered Master (base / receiver), which decodes the code, switches a relay output (siren / load), and reports to a host PC over USB (FT232RL → USB-C).

Scope: PCB only — schematic, layout, BOM, and fab/assembly outputs. Firmware is tracked on the dashboard but not delivered in this repo.

Status

• Slave (R-Slave) board — Hardware/B-W_Slave/ (2-layer, KiCad 9). Schematic + PCB layout complete (routed, populated, R_Slave_Schematic.pdf exported).
• Master (T_Master) board — Hardware/B-W_Master/ (2-layer, KiCad 9). (Renamed from B-W_Masrter — typo fixed.) Schematic complete (T_Master_Schematic.pdf exported). PCB layout not started.

The boards are no longer the same design — the Master schematic was substantially redesigned this pass (see below). Team-preparation and R&D phases for the project are complete.

Boards

Slave (unchanged this pass):

• MCU: ATmega328P-A @ 16 MHz resonator (Arduino-Nano-style net naming).
• RF: onboard CY11 super-heterodyne part, 433.92 MHz, with a dedicated ANT connector broken out on the PCB. (Labelled as a receiver, but the Slave needs to transmit — open item.)
• USB: FT232RL → USB-C, with USBLC6-2SC6 TVS + 1 A polyfuse.
• Power: mains L/N → onboard 5 V/600 mA SMPS module.
• Output: relay K1 (BC847B-driven, flyback diode) → COM/NC/NO + A/B screw terminals.
• Antenna: 50 Ω, ~17 cm ¼-wave whip.

Master (redesigned this pass):

• MCU: ATmega328P-A @ 16 MHz resonator, same net-naming convention.
• RF (changed): onboard CY11 removed — RF now goes through an external 4-pin "RF-Tx" header (J6); an off-board module plugs in instead. (Confusing label for a receiving board — open item.)
• USB: FT232RL → USB-C, same protection as the Slave.
• Power (changed): mains SMPS and the 3.3 V AMS1117 LDO are both removed. New solar/battery front end: SOLAR input → CN3791 MPPT controller → CN3065 Li-ion buck charger → a 1S Li-ion cell, protected by the existing DW01A + FS8205A BMS.
• Output: same relay block as the Slave.

Repository layout

B-W_Master_Slave_RF/
├─ CLAUDE.md                     # engineering continuity notes (authoritative design record)
├─ README.md
├─ Project_Report.pdf            # dashboard snapshot (MSRF-1.0)
├─ R_Slave_Schematic.pdf         # duplicate export — also under Hardware/B-W_Slave/
├─ Hardware/
│  ├─ B-W_Master/                # Master KiCad 9 project — RF via external module now
│  │  ├─ B-W_Master.kicad_pro / .kicad_sch / .kicad_pcb
│  │  ├─ PORG.kicad_sch (PROG) · Relay_5V.kicad_sch · BMS_sch.kicad_sch · Solar_CHRG.kicad_sch
│  │  ├─ T_Master_Schematic.pdf  # exported schematic
│  │  └─ STEP/
│  └─ B-W_Slave/                 # Slave KiCad 9 project — schematic + layout complete
│     ├─ B-W_Slave.kicad_pro / .kicad_sch / .kicad_pcb
│     ├─ PORG.kicad_sch (PROG) · Relay_5V.kicad_sch · R_Slave_Schematic.pdf
│     └─ STEP/
├─ references/                   # datasheets (CN3065, FT232R, CN3791) + reference photos
├─ scripts/                      # dashboard sync (sync-dashboard.mjs, install-hook.mjs)
└─ package.json · pm-sync.json · CLAUDE-md-sync-block.md · .githooks/pre-push

Open items to verify

• Slave RF direction: the Slave's onboard CY11 part is a receiver, but the Slave needs to transmit — this mismatch predates this pass and is still unresolved.
• Master RF header: the Master's onboard CY11 was removed in favor of an external 4-pin "RF-Tx" header (J6) — confirm what module plugs in, its pinout, and rename the connector (a "TX" label on a receiving board is confusing).
• Relay coil voltage: part is JQC-3FF-024-1Z (the 024 = 24 V coil) on a Relay_5V / +5 V sheet, on both boards — confirm the correct 5 V (-005) part or the intended coil supply.
• Solar/battery power path (new, Master only): SOLAR input → CN3791 MPPT → CN3065 Li-ion charger → 1S cell (DW01A + FS8205A protected) replaces the mains SMPS + 3.3 V LDO entirely — confirm this is the intended product direction, verify the charge-chain wiring against the datasheets in references/, and size the panel for the system's load.
• Whether the Slave's USB-C also powers the board alongside its mains SMPS (avoid contention).
• Naming: both root sheets' title blocks still read "R_Slave" (even on the Master); PORG.kicad_sch (typo for PROG); empty PWR_IN sheet on both boards.
• File dedup: R_Slave_Schematic.pdf now exists at both repo root and Hardware/B-W_Slave/.

Project info

• Client: B-W Technology Company · Design house: IRAQ_PCB · Rev: 1.0
• Schedule: start 30 Jun 2026 · client delivery 21 Jul 2026 (3-week build) · budget IQD 325,000
• Full engineering continuity notes: see CLAUDE.md.

Dashboard sync

npm run sync (or any git push, via .githooks/pre-push) writes pm-sync.json for the IoT PM dashboard. See CLAUDE-md-sync-block.md.