Design a simple fan on/off controller using an STM32F103C8T6 development board to drive a fan via a MOSFET, including proper power input, protection elements, and maintained programming/debug access.
Specify fan operating voltage/current and identify external power source parameters.
Establish grounding strategy and signal interfacing between the STM32 board and the MOSFET drive stage.
Develop the power and switching schematic
Add an external power connector and necessary regulation components if required.
Implement the MOSFET driver path by connecting an STM32 GPIO to the MOSFET gate with the proper gate resistor and pull-down resistor.
Integrate protection components
Add a flyback diode to protect the MOSFET from inductive kickback from the fan.
Include input polarity and overcurrent protection where necessary.
Retain programming and debug access
Maintain or expose SWD/UART/programming headers.
Design the layout to isolate sensitive programming/debug signals from the fan power path.
Validate design for readiness
Review component ratings, PCB layout considerations (e.g., proper current handling, thermal margins), and ensure that all sub-systems meet the required specifications.
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power