Raspberry Pi LED Wiring

flux

The completion executor finished its correction/routing pass. Before that pass, I confirmed the board was 65 × 56.5 mm but had an out-of-bounds Pi header, overlapping copper, severe congestion, and 19 unrouted connections.
Remaining
  • Independently inspect the executor’s final placement and routing
  • Re-run ERC/DRC to confirm zero airwires, overlaps, and out-of-bounds parts
  • Verify Pi 3B+ header and mounting-hole geometry
I can’t perform those final checks because no ACUs are currently available.
Received notification from "Raspberry Pi HAT PCB" that it finished — picking the work back up.

flux

The Raspberry Pi HAT PCB executor reports the correction/routing pass completed, but I cannot independently inspect or reconcile the resulting board because the account currently has no available ACUs.
Still required before fabrication:
  • Re-run ERC/DRC and confirm zero airwires, shorts, overlaps, and out-of-bounds items
  • Verify Pi 3B+ header and mounting-hole geometry
  • Review trace widths, ground return paths, connector labels, and top-side assembly
  • Generate manufacturing files only after those checks pass
Review board state
Check ERC and DRC
Verify HAT mechanics
Prepare fabrication checklist
Sign up to send

Files

Schematic

Layout

Preview

Board Bring-Up Plan
Pre-Power Inspection
  1. Confirm no 12 V wire is connected to the HAT.
  2. Verify U1 orientation and that C2/C3 polarity is correct.
  3. Check resistance between PI_5V_LOGIC and RING_5V_EXT; it must not be a short.
  4. Check resistance from each power rail to GND for assembly shorts.
Pi Logic Power Test
  1. Leave all external LED supplies and loads disconnected.
  2. Power the Raspberry Pi normally.
  3. Measure PI_5V_LOGIC at U1 VCC: expected approximately 5 V.
  4. Confirm RING_5V_EXT remains 0 V.
  5. Confirm U1 channel 4 output is high impedance.
Ring Power Isolation Test
  1. Turn the Pi off.
  2. Apply regulated 5 V to J4 pin 1 (+) and J4 pin 2 (GND).
  3. Verify J5 pin 1 is approximately 5 V and J5 pin 2 is GND.
  4. Verify the Pi 5 V header/PI_5V_LOGIC is not powered by the ring adapter.
Data Output Test
  1. Power the Pi; connect grounds before data or LED power.
  2. Use an oscilloscope or logic analyzer at J2 pin 1, J3 pin 1, and J5 pin 3.
  3. Confirm idle/data levels are approximately 0/5 V and each output responds only to its assigned GPIO stream.
  4. Test with a short LED segment or the ring at low brightness before connecting full strips.
Full Load Test
  1. Power each 12 V strip directly from its own 12 V/10 A adapter; connect only DIN/GND to J2 or J3.
  2. Power the ring from its separate regulated 5 V >=2 A adapter through J4.
  3. Run full-white ring briefly and verify J4/J5 terminals and PCB copper remain cool.
  4. Exercise all three outputs simultaneously and check for resets, flicker, or data corruption.
Pass Criteria
  • No voltage transfer between external ring 5 V and Pi 5 V.
  • No 12 V present anywhere on the HAT.
  • Three independently controlled, clean 5 V data outputs.
  • Stable operation under simultaneous output updates and maximum intended ring load.

  • Pre-Power Inspection

  • Pi Logic Power Test

  • Ring Power Isolation Test

  • Data Output Test

  • Full Load Test

  • Pass Criteria