BLDC Blower Controller
Please choose option 2, but with a slight correction: we are using an onboard 5x20mm glass cartridge fuse holder (THT), not a blade fuse. Please add this THT fuse holder to the schematic and PCB near the input terminal.
After adding it, proceed with compacting the board to under 80x80mm following the previous placement rules.
Additionally, please add four 3.2mm mounting holes (suitable for M3 screws) in the four corners of the PCB. Place them about 3-4mm inward from the board outline, and ensure there is enough clearance around them so the screw heads or standoffs won't short any traces or components.
Thought
I’ll add a THT 5×20 mm fuse holder and M3 mounting holes, insert the fuse into the 18 V input path, resize the board below 80×80 mm, compact-place everything to the enclosure edges, then reroute and verify.
Worked
The fuse is now electrically in series, the compact Nano and flyback footprints are in place, and the board is resized to 79×79 mm with four 3.2 mm corner holes. I’m running the dense placement pass now.
Worked
I’m blocked because the project has no available ACUs, so I cannot complete the remaining layout operations.
Completed:
- Added and wired the THT 5×20 mm fuse holder in series with the battery input.
- Resized the board to 79×79 mm.
- Added four 3.2 mm corner mounting holes with 7 mm screw-head clearance envelopes.
- Replaced the oversized Nano and flyback-diode footprints with more compact THT alternatives.
- Removed the previous routing in preparation for rerouting.
Remaining:
- Resolve overlaps from the first dense placement attempt.
- Confirm all components and mounting-hole clearances fit within 79×79 mm.
- Reapply the 2.8 mm high-current rules to
BAT_RAW. - Auto-route and run final ERC/DRC checks.
- Regenerate Gerber/drill files afterward.
Additional ACUs are required to continue execution.
Resume compact layout
Show overlap issues
Check fuse clearance
Run final checks
