2 layers30 × 30 mm
Hb bob r1p0
gregdavill/daikin-esp
ESP32-C3 hardware to connect to a Daikin ducted A/C system. enabling WiFi control in Home Assistant.
67 parts29
4 layers50 × 31 mm
Sapphire captain
gregdavill/daikin-esp29ESP32-C3 hardware to connect to a Daikin ducted A/C system. enabling WiFi control in Home Assistant.
- Size
- 50 × 31 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 77
- Nets
- 72
- Pads
- 289
- Tracks, vias
- 564, 97
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 28 Apr 2024
- Updated
- 9 Jun 2026
Overview
Sapphire captain is an open-source printed circuit board by gregdavill, from the gregdavill/daikin-esp repository on GitHub. It is a 4-layer board of 50 × 31 mm with 77 parts on 72 nets, routed with 564 tracks and 97 vias.
It is built around the ESP32-C3-MINI-1, MT2492 and TLV62569DRL, with the XL1192S among its other parts. Its parts include 25 resistors, 19 capacitors, 8 diodes, 4 ICs and 3 connectors. It belongs with the radio and wireless and home automation and IoT boards and the ESP32 and RISC-V boards of this library.
Main components
4ESP32-C3-MINI-1
--40℃~+81℃ -89dBm 2.4GHz 350mA 3V~3.6V 82mA ESP32-C3 Chip On-board PCB Antenna UART - WiFi Modules ROHSRF CrazyWiFi Modules
MT2492
SOT-23-6-40℃~+85℃@(TA) 1 2A 4.5V~16V 600kHz Adjustable Buck Buck Built-in Yes SOT-23-6 DC-DC Converters ROHS西安航天民芯DC-DC Converters
TLV62569DRL
SOT-563-40℃~+125℃@(TJ) 1 1.5MHz 2.5V~5.5V 2A 35uA 600mV~5.5V Adjustable Buck Built-in Overcurrent Protection、Light load efficient mode、Operating status indication Step-down type Yes SOT-563 DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
XL1192S
SOP-16-40℃~+125℃ 12mA 4.75V~5.25V 68mA SOP-16 Interface - Specialized ROHSXLSEMIInterface - Specialized
README
README.mdDaikin-ESP
Wireless A/C Controller, an ESP32-C3 based hardware module to connect to a Daikin ducted A/C system and enable WiFi control in Home Assistant.
Hardware
The PCB repo contains a few different designs:
saphire-captain: Initial ESP32 + XL1192 board. Power extraction from the bus and transmission didn't work well.hb-bob-r0.1: Breakout board designed for the MAX22088 homebus transceiver. This board enabled rx/tx and power from the P1P2 bus.esp-daikin-r1.0: Basic ESP32-C3 board with DCDC, dosigned to attach directly to the hb-bob board.
Firmware
The current firmware targets the esp-daikin + hb-bob PCB combo. Initial flashing is done with a serial connection to the ESP32-C3. Once flashed OTA updates are supported.
The firmware makes use of esphome to provide the WiFi and Home Assistant code base. A simple C++ component is used to handle the low level encoding, and protocol level decoding.
Parts
77| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C2, C4, C13, C16, C18, C19, C20 |
| 5 | 10k | Resistor_SMD:R_0402_1005Metric | R14, R15, R16, R18, R21 |
| 4 | D_Filled | Diode_SMD:D_SOD-123F | D2, D3, D4, D5 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 3 | 10uF | Capacitor_SMD:C_0603_1608Metric | C5, C6, C11 |
| 3 | 22nF | Capacitor_SMD:C_0402_1005Metric | C7, C8, C9 |
| 3 | 470R | Resistor_SMD:R_0402_1005Metric | R20, R22, R23 |
| 2 | 1.5k | Resistor_SMD:R_0402_1005Metric | R2, R3 |
| 2 | 100mA | Fuse:Fuse_0402_1005Metric | F1, F2 |
| 2 | 1R | Resistor_SMD:R_0805_2012Metric | R10, R11 |
| 2 | 220R | Inductor_SMD:L_0402_1005Metric | FB1, FB2 |
| 2 | 22k | Resistor_SMD:R_0402_1005Metric | R4, R17 |
| 2 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | 5.1K | Resistor_SMD:R_0402_1005Metric | R24, R25 |
| 2 | 5.6V | Diode_SMD:D_SOD-123F | D6, D7 |
| 2 | 75k | Resistor_SMD:R_0402_1005Metric | R8, R9 |
| 1 | 0R | Resistor_SMD:R_0402_1005Metric | R13 |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric | R7 |
| 1 | 10uH | Inductor_SMD:L_Taiyo-Yuden_NR-30xx | L2 |
| 1 | 115k | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 16V | Diode_SMD:D_SOD-123F | D1 |
| 1 | 1uF | Capacitor_SMD:C_0402_1005Metric | C14 |
| 1 | 2.2uH | Inductor_SMD:L_Taiyo-Yuden_NR-30xx | L1 |
| 1 | 22uF | Capacitor_SMD:C_1206_3216Metric | C3 |
| 1 | 22uF | Capacitor_SMD:C_0805_2012Metric | C17 |
| 1 | 25.5k | Resistor_SMD:R_0402_1005Metric | R6 |
| 1 | 30R | Resistor_SMD:R_2010_5025Metric | R1 |
| 1 | 4.7k | Resistor_SMD:R_0402_1005Metric | R19 |
| 1 | 470p | Capacitor_SMD:C_0402_1005Metric | C12 |
| 1 | 47uF | Capacitor_SMD:CP_Elec_6.3x4.5 | C15 |
| 1 | 6.8pF | Capacitor_SMD:C_0402_1005Metric | C10 |
| 1 | Conn_01x02 | TerminalBlock_WAGO:TerminalBlock_WAGO_236-102_1x02_P5.00mm_45Degree | J1 |
| 1 | DNP | Resistor_SMD:R_0402_1005Metric | R12 |
| 1 | ESP32-C3-MINI-1 | Espressif:ESP32-C3-MINI-1 | U4 |
| 1 | G*** | kibuzzard-63AA625E | kibuzzard-63AA625E |
| 1 | G*** | kibuzzard-63AA6611 | kibuzzard-63AA6611 |
| 1 | G*** | kibuzzard-63AA640E | kibuzzard-63AA640E |
| 1 | G*** | kibuzzard-63AA5C76 | kibuzzard-63AA5C76 |
| 1 | G*** | kibuzzard-63AA6405 | kibuzzard-63AA6405 |
| 1 | JTAG/SW Interface | Connector_PinHeader_1.27mm:PinHeader_2x05_P1.27mm_Vertical_SMD | J3 |
| 1 | LED_ARGB | lib:0404LED_RGB | D8 |
| 1 | MT2492 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | SW_DIP_x01 | Button_Switch_SMD:SW_SPST_PTS810 | SW1 |
| 1 | TLV62569DRL | Package_TO_SOT_SMD:SOT-666 | U2 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_XKB_U262-16XN-4BVC11 | J2 |
| 1 | XL1192 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U3 |
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Questions
How big is the Sapphire captain PCB?
It measures 50 × 31 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Sapphire captain use?
77 parts, built around the ESP32-C3-MINI-1, MT2492, TLV62569DRL and XL1192S. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Sapphire captain KiCad files?
From the gregdavill/daikin-esp repository on GitHub, at the commit this page was made from: the board is pcb/sapphire-captain/kicad-src/sapphire-captain.kicad_pcb and its schematic pcb/esp-daikin/kicad-src/esp-daikin-r1p1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sapphire captain design in my own project?
Its repository states no licence, so its author keeps all rights: ask gregdavill before reusing the design.