SisuAssistant
About the SisuAssistant PCB
SisuAssistant is an open source ESP32 PCB design by Cadburies, published on GitHub under the Apache-2.0 license. It is a 4-layer board measuring 66.5 × 70 mm, with 155 components from 75 distinct parts.
Its main chip is the C42417293, from the ESP32 family. Other key parts include the C479074, INA226AQDGSRQ1, C502477, C466970 and C466971. By type, the board carries 46 resistors, 40 capacitors, 21 ICs, 20 diodes, 10 inductors and 5 connectors.
It belongs with the iot & wireless and sensors designs in this gallery.
From the project
Sailing yacht Sisu: Home Assistant + ESPHome Marine Board (alternator regulation, tanks) + MQTT kernel, Signal K/Grafana/InfluxDB on a NAS, and Sisu Nav chart & weather-routing cockpit.
A robust, battery-powered ESP32-S3 board designed for real-world 12 V applications — featuring CAN bus, high-current PWM, relay output, power monitoring, and protected I/O.
Perfect for motor control, sensor hubs, marine/RV systems, automotive projects, and industrial IoT.
- ESP32-S3-WROOM-2 module with Wi-Fi + Bluetooth 5 - 12 V battery input with robust power filtering and protection - CAN bus interface (ISO 11898-1 compliant) - High-current PWM driver with MOSFET output - 12 V SPDT Relay with opto-isolation - 3× INA226 precision voltage & current monitors (I²C) - Opto-isolated and…
Main components on the SisuAssistant
SisuAssistant bill of materials (BOM)
155 components, 75 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | C479074 SY8089A1AAC Silergy(矽力杰) | TSOT-23-5 | U1 |
| 3 | INA226AQDGSRQ1 INA226 TI | VSSOP-10_3x3mm_P0.5mm | U2, U18, U19 |
| 1 | C502477 TPS5430DDA | TI_SO-PowerPAD-8_ThermalVias | U3 |
| 3 | C466970 DB125-3.5-2P-GN-S | CONN-TH_2P-P3.50_L7.4-W7.0 | U4, U5, U6 |
| 4 | C466971 DB125-3.5-3P-GN-S | CONN-TH_3P-P3.50_L7.4-W10.5 | U7, U9, U12, U13 |
| 1 | C42417293 ESP32-S3-WROOM-2-N32R16V | ESP32-S3-WROOM-2 | U8 |
| 1 | C5362157 05A20L20P HanElectricity(瀚源) | FPC-SMD_20P-P0.50_L5.9-W14.4 | U10 |
| 1 | C12084 SN65HVD230DR | SOIC-8_3.9x4.9mm_P1.27mm | U11 |
| 4 | C3008369 PC817C-S | SOP-4_L6.5-W4.6-P2.54-LS10.3-TL | U14, U16, U17, U21 |
| 1 | C7835 SN74LVC1G14DBVR TI(德州仪器) | SOT-23-5 | U22 |
| 1 | C640313 MCP1407-E/MF_C640313 MICROCHIP(美国微芯) | DFN-8_L6.0-W5.0-P1.27-BL-EP4.0 | U23 |
| 2 | S8050 | SOT-23 | Q2, Q3 |
| 1 | C52191006 BUK762R4-60E VBsemi(微碧半导体) | TO-263-2_L10.1-W9.1-P5.08-LS15.2-BR | Q4 |
| 2 | 1729128 MKDSN 1,5/ 2-5,08 Phoenix Contact | CONN-TH_2P-P5.08_1729128 | CN1, CN2 |
| 1 | SM04B-SRSS-TB(LF)(SN) SM04B-SRSS-TB (LF)(SN) JST | CONN-SMD_4P-P1.00_SM04B-SRSS-TB-LF-SN | CN3 |
| 1 | USB2.0_14P USB_C_Receptacle_USB2.0_16P | USB_C_Receptacle_HCTL_HC-TYPE-C-16P-01A | J1 |
| 1 | DISP_QSPI_4IN_18P | FH12-18S-0.5SH_QSPI4IN | J2 |
| 1 | KLJ-4020 KELIKING | BUZ-SMD_L4.0-W4.0-P3.50-L | BUZZER1 |
| 1 | C492610 5A | FUSE-TH_XF-506P | F1 |
| 1 | C492610 1A | FUSE-TH_XF-506P | F2 |
Show 55 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | C492610 15A | FUSE-TH_XF-506P | F3 |
| 1 | C318884 Flash | SW_Push_1P1T_XKB_TS-1187A | Flash1 |
| 2 | C52016390 MALE HEADER CONNECTOR hanxia(韩下) | PinHeader_1x02_P2.54mm_Vertical | H6, H7 |
| 1 | C703015 CAN Bus Term | PinHeader_1x02_P1.27mm_Vertical | JP1 |
| 1 | C30431 SRD-12VDC-SL-C | RELAY-TH_SRD-XXVDC-XL-C | Relay1 |
| 1 | C318884 Reset | SW_Push_1P1T_XKB_TS-1187A | Reset1 |
| 3 | SS14 MDD(Microdiode Semiconductor) | D_SMA | D1, D4, D15 |
| 2 | ESD5Z3.3T1G H5VL10B TECH PUBLIC | D_SOD-882 | D2, D3 |
| 1 | SMBJ18A BORN | D_SMB | D6 |
| 1 | C417538 LMBR340FT1G | D_SOD-123F | D7 |
| 1 | C506523 VS-43CTQ100S-M3 VISHAY(威世) | D2PAK_L10.0-W9.0-P2.54-LS15.0-TL-1 | D8 |
| 6 | ESD5Z3.3T1G TECH PUBLIC | D_SOD-523 | D9, D11, D12, D13, D18, D19 |
| 1 | C2687121 PESD1CAN | SOT-23 | D10 |
| 1 | C18199169 SS56 R+O(宏嘉诚) | D_SMA | D14 |
| 2 | C2286 LED | LED_0603_1608Metric | D16, D17 |
| 1 | C12790 MBRS3100T3G onsemi(安森美) | D_SMC | D20 |
| 1 | C70426 S3MB-13-F DIODES(美台) | D_SMB | D22 |
| 1 | C435392 1uH 3.3A 40mΩ muRata(村田) | L_1008_2520Metric | L1 |
| 1 | C5368704 22uH | IND-SMD_L12.5-W12.5_B82477P4XX | L2 |
| 3 | BLM21PG121SN1D | L_0805_2012Metric | L3, L4, L6 |
| 1 | C225048 CDRH104RNP-150NC | IND-SMD_L10.2-W10.0 | L5 |
| 3 | C74764 FerriteBead | L_0805_2012Metric | L7, L9, L10 |
| 1 | C97856 DLW21SN900SQ2L | FILTER-SMD_4P-L2.0-W1.2-BL_DLW21H | L8 |
| 2 | CL05A106MQ5NUNC 10uF Samsung Electro-Mechanics | C_0402_1005Metric | C1, C25 |
| 21 | CL05B104KO5NNNC 0.1uF Samsung Electro-Mechanics | C_0402_1005Metric | C2, C3, C5, C7, C9, C11, C12, C14 +13 |
| 2 | C3845593 22uF muRata | C_0402_1005Metric | C4, C8 |
| 1 | C88896 6.8pF muRata | C_0402_1005Metric | C6 |
| 3 | CL05A475MP5NRNC 4.7uF Samsung Electro-Mechanics | C_0402_1005Metric | C10, C30, C33 |
| 1 | GRM21BR61H106KE43L 10uF/50V muRata | C_0805_2012Metric | C13 |
| 1 | GRM31CR61E476ME44L 47uF muRata | C_1206_3216Metric | C15 |
| 1 | CL05A475MP5NRNC 4.7uF Samsung Electro-Mechanics | C_1206_3216Metric | C16 |
| 1 | CL05A106MQ5NUNC 10uF Samsung Electro-Mechanics | C_1206_3216Metric | C17 |
| 1 | CL05B103KB5NNNC 10nF Samsung Electro-Mechanics | C_0402_1005Metric | C18 |
| 1 | C72494 220uF 10V Lelon | CAP-SMD_BD6.3-L6.6-W6.6-FD | C20 |
| 1 | GRM1555C1H152JA01D 1.5nF muRata | C_0402_1005Metric | C21 |
| 1 | GRM1555C1H151JA01D 150pF muRata | C_0402_1005Metric | C23 |
| 2 | GCM155R71H473KE02D 47nF muRata | C_0402_1005Metric | C26, C29 |
| 1 | C37323734 1.2uF 100V Chinocera(华瓷) | C_1210_3225Metric | C39 |
| 2 | C25905 5.1K | R_0402_1005Metric | R1, R2 |
| 13 | C25744 10K | R_0402_1005Metric | R3, R10, R15, R20, R25, R26, R27, R28 +5 |
| 1 | C149504 100K UNI-ROYAL(厚声) | R_0805_2012Metric | R4 |
| 1 | C25105 33R | R_0402_1005Metric | R5 |
| 1 | 33R | R_0402_1005Metric | R6 |
| 4 | C2907296 10 | R_0805_2012Metric | R7, R9, R35, R36 |
| 1 | C17560 22K UNI-ROYAL(厚声) | R_0805_2012Metric | R8 |
| 1 | C2089436 200m | R_0201_0603Metric | R11 |
| 1 | C53159429 3k24 | R_0402_1005Metric | R12 |
| 1 | C23079 549 | R_0603_1608Metric | R13 |
| 7 | C17437 120 | R_0805_2012Metric | R14, R19, R21, R23, R24, R49, R50 |
| 2 | C175364 47K/1W EVER OHMS(天二科技) | R_2512_6332Metric | R16, R46 |
| 5 | C11702 1K | R_0402_1005Metric | R22, R29, R30, R41, R44 |
| 1 | C17408 100 | R_0805_2012Metric | R31 |
| 2 | C25117 470R | R_0402_1005Metric | R33, R34 |
| 2 | C48996903 3.9 | R_0805_2012Metric | R38, R39 |
| 1 | C2075262 2K2 TE Connectivity(泰科电子) | R_2512_6332Metric | R47 |
SisuAssistant design files
The KiCad project lives in the Cadburies/SisuAssistant repository on GitHub; these links point at the commit this page was built from.
SisuAssistant: common questions
What microcontroller does the SisuAssistant use?
The SisuAssistant is built around the C42417293, from the ESP32 family.
How big is the SisuAssistant PCB?
The SisuAssistant measures 66.5 × 70 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the SisuAssistant?
155 components, from 75 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the SisuAssistant design files?
From the Cadburies/SisuAssistant repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the SisuAssistant design in my own project?
Yes, under the terms of its Apache-2.0 license, which Cadburies chose for the repository.
Can I test firmware for the SisuAssistant without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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