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Custom STM32H753 main controller board for modular motion, control, storage, communication, and daughter-board expansion.
BRAIN_BOARD is the clean logic/control board in a modular hardware system. It handles MCU control, communication, debugging/programming, storage, sensor inputs, and daughter-board interfaces. Noisy motor power and phase switching are kept on external boards such as DIRTY_MTR_BOARD.
In progress. Main controller schematic and PCB layout under development/review.
Host / USB / RS485 / CAN
↓
BRAIN_BOARD
↓ STEP / DIR / SPI / GPIO
DIRTY_MTR_BOARD / daughter boards
↓
Motor / sensors / external hardware
BRAIN_BOARD does not directly drive stepper motor coils. Motor current, switching, and noisy power handling belong on dedicated daughter boards.
| Item | Value |
|---|---|
| MCU | STM32H753ZITx |
| Package | LQFP-144 |
| Logic rail | +3.3V |
| USB | USB-C |
| External communication | RS485, CAN |
| Storage | microSD |
| Nonvolatile memory | SPI FRAM |
| Debug/programming | SWD / debug UART headers |
| Daughter-board support | Motor/control, analog I/O, manual jog, external flags |
| Power options | USB or VIN path with jumper selection |
| Board role | Main controller / system brain |
BRAIN_BOARD is intended to keep logic power clean and separate from noisy motor power.
USB-C / VIN input path
↓
power selection / protection
↓
+3.3V logic rail
↓
STM32H753 + memory + communication interfaces
Motor power is not generated or switched directly on BRAIN_BOARD.
Planned or related daughter boards include:
Manual jog style inputs are intended to be active-low. External buttons pull the signal to GND when pressed.
Design priorities:
Expected image paths for GitHub README rendering:
Outputs/
IMG/
3D-T.png
3D-B.png
SCHEMATIC.png
L1-SIG.png
L2-3V3.png
L3-GND.png
L4-MIX.png
BRAIN_BOARD is a low-voltage controller PCB. Motor power, external loads, and high-current switching should be handled on separate boards with appropriate power routing, protection, and review.
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