Brushed DC Motor Controller

Created 2 project docs

Firmware Starter — STM32G431CBT6

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MCU: STM32G431CBT6 Framework: STM32 HAL

Board Bring-Up Plan — Closed-Loop DC Motor Controller

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Equipment: current-limited bench supply, DMM, oscilloscope, ST-LINK/SWD debugger, USB-UART adapter, encoder simulator or known encoder, dumm...

flux

Implemented and verified the schematic for the closed-loop brushed DC motor controller.
What was completed:
  • Added a robust 12 V nominal motor-controller architecture: MC33926 H-bridge, STM32G431 MCU, INA240 current sense, LMR33630 3.3 V buck, LM74700 reverse protection, encoder conditioning, connectors, LEDs, and protection.
  • Wired power, motor drive, current sensing, encoder A/B/Z, SWD, UART control, reset/BOOT0, and fault/status paths.
  • Ran schematic/ERC checks; there are no open ERROR/WARNING/UNCERTAIN checks in the reviewed schematic categories.
Project files created/updated:
Open items:
  • Layout is not started yet; high-current motor paths, shunt Kelvin routing, buck layout, and thermal copper will be critical.
  • Firmware starter is a HAL bring-up baseline; final PID/current-limit tuning still needs motor characterization.
Suggested next steps:
  1. Set PCB constraints: board size, stackup, current-aware trace widths, and clearance rules.
  2. Place components with power path and thermal priorities.
  3. Route the PCB, then run DRC/PI checks.
  4. Add test points for 3V3, VM_PROT, HBRIDGE_EN, current sense, and encoder signals.
tabo

tabo

Set PCB constraints, place the components, and route the board with power-path priorities.

flux

The schematic is complete and ERC-clean with 76 components and 48 nets, including the protected input, 3.3 V buck, MC33926 H-bridge, INA240 current sensing, STM32 control, encoder conditioning, and external interfaces.
I can’t execute PCB setup, placement, or routing because your account currently has no available ACUs.
Remaining work:
  • Define board outline, layer stackup, clearances, and current-based trace widths.
  • Prioritize placement for the input protection, buck converter, H-bridge thermal pad, motor connector, and Kelvin-sensed shunt.
  • Place MCU, decoupling, encoder conditioning, SWD, UART, and status circuitry away from switching nodes.
  • Route motor/power paths first, then buck loops, current-sense Kelvin pairs, control signals, and ground pours.
  • Run routing checks and DRC, resolving all airwires, neckdowns, thermal, and clearance issues.
Plan layout priorities
Export BOM and PDF
Document layout constraints
Review BOM risks
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Closed-Loop DC Motor Controller

Closed-Loop DC Motor Controller thumbnail
Robotics-ready closed-loop brushed DC motor controller with bidirectional 2 A H-bridge drive, quadrature encoder feedback, current sensing, protection, MCU control, debug access, and status indicators.

Properties

Properties describe core aspects of the project.

Pricing & Availability

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Qty 1

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$15.56–$23.50

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$18.16

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Mouser

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TME

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Verical

$12.03–$24.30

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