2 layers40 × 20 mm
2 layers53.8 × 33.5 mm
Modbus hbridge hw
AlmCoding/modbus-hbridgeThis H-Bridge module is designed for PWM-controlled DC motor, solenoid, valve, and other DC load applications. It communicates over RS485 using MODBUS RTU, making it easy to integrate into PLC, microcontroller, and…
- Size
- 53.8 × 33.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 21
- Pads
- 54
- Tracks, vias
- 83, 16
- Pours
- 70
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 2 Apr 2026
- Updated
- 10 Oct 2026
Overview
Modbus hbridge hw is an open-source printed circuit board by AlmCoding, from the AlmCoding/modbus-hbridge repository on GitHub. It is a 2-layer board of 53.8 × 33.5 mm with 13 parts on 21 nets, routed with 83 tracks and 16 vias.
Its parts include 4 resistors, 4 ICs, 2 capacitors and 1 connector. It belongs with the interfaces and adapters boards and the ESP32 and RISC-V boards of this library.
README
README.mdMODBUS RTU RS485 40A H-Bridge Module
This H-Bridge module is designed for PWM-controlled DC motor, solenoid, valve, and other DC load applications. It communicates over RS485 using MODBUS RTU, making it easy to integrate into PLC, microcontroller, and PC-based systems without any proprietary protocol.
This 40A H-Bridge is suitable for driving brushed DC motors and other DC loads in industrial, automation, and robotics setups.
Project folders
modbus-hbridge-fw— Firmware source files for the device, including the embedded software project.
License: Apache License 2.0.modbus-hbridge-hw— PCB design files, schematics, and board layout for the H-Bridge hardware.
License: CERN Open Hardware Licence Version 2.modbus-hbridge-3d— 3D printable enclosure files and case models for the module.
License: CERN Open Hardware Licence Version 2.
Python library
Control the device using the Python library repository: https://github.com/AlmCoding/modbus-py
Purchase options
The device is available for purchase on Tindie: https://www.tindie.com/products/almcoding/modbus-rtu-rs485-40a-h-bridge-module/
Parts
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R4 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R3 |
| 2 | 2.2uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2 |
| 2 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2 |
| 1 | DCDC-Module | 01_alexander_lib:DCDC-Module-S | U3 |
| 1 | ESP32-C3-Super-Mini | 01_alexander_lib:ESP32-C3-SuperMini | U2 |
| 1 | H-Bridge-Module | 01_alexander_lib:H-Bridge-Module | U4 |
| 1 | MAX3485-Module | 01_alexander_lib:MAX3485-Module | U1 |
| 1 | Screw_Terminal_01x04 | TerminalBlock_CUI:TerminalBlock_CUI_TB007-508-04_1x04_P5.08mm_Horizontal | J1 |
Questions
How big is the Modbus hbridge hw PCB?
It measures 53.8 × 33.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Modbus hbridge hw use?
13 parts. 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 Modbus hbridge hw KiCad files?
From the AlmCoding/modbus-hbridge repository on GitHub, at the commit this page was made from: the board is modbus-hbridge-hw/modbus-hbridge-hw.kicad_pcb and its schematic modbus-hbridge-hw/modbus-hbridge-hw.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Modbus hbridge hw design in my own project?
Its repository states no licence, so its author keeps all rights: ask AlmCoding before reusing the design.
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