2 layers84 × 26 mm
Ui board
wojtek-00/HomeAutomation
A modular home automation system built around ESPHome, custom PCB design (KiCad), and 3D-printed enclosures.
36 parts
2 layers100 × 85 mm
Current
wojtek-00/HomeAutomationA modular home automation system built around ESPHome, custom PCB design (KiCad), and 3D-printed enclosures.
- Size
- 100 × 85 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 102
- Nets
- 97
- Pads
- 392
- Tracks, vias
- 925, 246
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 28 May 2026
- Updated
- 24 Jun 2026
Overview
Current is an open-source printed circuit board by wojtek-00, from the wojtek-00/HomeAutomation repository on GitHub. It is a 2-layer board of 100 × 85 mm with 102 parts on 97 nets, routed with 925 tracks and 246 vias.
It is built around the TCMT4100, BC548 and HF46F/12-HS1T. Its parts include 44 resistors, 16 connectors, 9 switches, 8 diodes and 8 transistors.
Main components
3
TCMT4100
SOP-16-4.4mm-40℃~+100℃ 1.35V 3.75kV 300mV@10mA,1mA 4 5.5us 50% 50mA 600% 60mA 6V 70V 7us DC Phototransistor SOP-16-4.4mm Transistor, Photovoltaic Output Optoisolators ROHSVishay IntertechnologyTransistor, Photovoltaic Output Optoisolators
BC548
TO-92TO-92 Bipolar (BJT) ROHSDDFBipolar (BJT)
HF46F/12-HS1T
插件,7x20.5mm-40℃~+85℃ 1 Set Normally Open: 1A (SPST NO) 100mΩ 10ms 10ms 12V 200mW 30V@DC、277V@AC 4 5A 5A@30VDC、5A@250VAC 720Ω AgSnO2 Non-Polarized - Single Coil 插件,20.5x7mm Power Relays ROHSHFPower Relays
README
README.mdHomeAutomation
A modular home automation system built around ESPHome, custom PCB design (KiCad), and 3D-printed enclosures.
The project is designed to be scalable, allowing multiple independent hardware modules (controller + expanders) that integrate into a single automation system.
🧠 System Overview
The project is split into two main domains:
🧩 hardware/
Contains all physical devices and their design artifacts:
- PCB designs (KiCad)
- 3D enclosures (STEP / CAD files)
- front panels / UI elements
- production-ready snapshots (releases)
Each hardware module is self-contained.
Current modules:
system_controller– main brain of the systemrelay_expander– relay output module (8 outputs + 8 inputs)- (future expanders will be added here)
⚙️ system/
Contains software and logic:
- ESPHome configurations
- automation logic (e.g. Home Assistant)
- device behavior definitions
- shared system-level configuration
This layer defines how devices behave, not how they are built.
🏗️ Hardware Module Structure
Each hardware module follows the same structure:
- hardware/<module_name>/
- current/ # active development (WIP)
- releases/ # frozen production versions
Parts
102| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R3, R4, R45, R46, R47, R48, R49, R50, R51, R52 |
| 8 | 1N4148 | Diode_SMD:D_SOD-123 | D4, D5, D6, D10, D11, D12, D15, D16 |
| 8 | 1k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R37, R38, R39, R40, R41, R42, R43, R44 |
| 8 | BC548 | Package_TO_SOT_THT:TO-92_Inline | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 |
| 8 | HF46F-12-HS1 | homeautomation_core:relay_HF46F | K1, K2, K3, K4, K5, K6, K7, K8 |
| 8 | Jumper_2_Open | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP2, JP3, JP4, JP5, JP6, JP7, JP8, JP9 |
| 8 | R10k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R12, R14, R16, R24, R26, R28, R34, R36 |
| 8 | R4,7k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R11, R13, R15, R23, R25, R27, R33, R35 |
| 8 | R470 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R5, R6, R7, R17, R18, R19, R29, R30 |
| 8 | Screw_Terminal_01x03 | homeautomation_core:TerminalBlock_Phoenix_MPT-0,5-3-2.54_1x03_P2.54mm_Horizontal_RELAY | J4, J5, J6, J7, J8, J9, J10, J11 |
| 4 | Screw_Terminal_01x03 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-3-2.54_1x03_P2.54mm_Horizontal | J12, J13, J14, J15 |
| 4 | TCMT4100 | Package_SO:SOP-16_4.4x10.4mm_P1.27mm | U2, U3, U4, U5 |
| 1 | 0.5A | Fuse:Fuse_1206_3216Metric | F2 |
| 1 | 100n | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1 |
| 1 | 1A, PTC | Fuse:Fuse_BelFuse_0ZRE0033FF_L11.4mm_W3.8mm | F1 |
| 1 | 39V, 250A | Fuse:Fuse_BelFuse_0ZRE0033FF_L11.4mm_W3.8mm | RV1 |
| 1 | Conn_01x07_Socket | homeautomation_core:PinSocket_1x07_P2.54mm_Horizontal_Right | J2 |
| 1 | Conn_01x07_Socket | homeautomation_core:PinHeader_1x07_P2.54mm_Horizontal_left | J1 |
| 1 | Conn_01x20_Socket | homeautomation_core:PinSocket_2x10_P1.27mm_Vertical | J16 |
| 1 | MCP23017x-x-SO | Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm | U1 |
| 1 | SW_DIP_x03 | Button_Switch_THT:SW_DIP_SPSTx03_Slide_6.7x9.18mm_W7.62mm_P2.54mm_LowProfile | SW1 |
| 1 | Screw_Terminal_01x04 | TerminalBlock:TerminalBlock_Xinya_XY308-2.54-4P_1x04_P2.54mm_Horizontal | J3 |
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Questions
How big is the Current PCB?
It measures 100 × 85 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Current use?
102 parts, built around the TCMT4100, BC548 and HF46F/12-HS1T. 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 Current KiCad files?
From the wojtek-00/HomeAutomation repository on GitHub, at the commit this page was made from: the board is hardware/relay_expander/current/pcb/main_board/main_board.kicad_pcb and its schematic hardware/relay_expander/current/pcb/boards_connector/boards_connector.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Current design in my own project?
Its repository states no licence, so its author keeps all rights: ask wojtek-00 before reusing the design.