PCB reliability + production

[engmung]

Goal

Reliable enough to ship. Failures trace to hand-soldering cold joints, not the design
→ move to PCBA, simplify the board, validate.

Reliability

• Simplified rev: remove debounce RC, keep decoupling caps
• PCBA quote + small test batch; validate with 10h burn-in inside the enclosure
• Swap encoders to PEC11R-4220F-S0024 + test (5 incoming); lock before the PCBA order

Power & controls

• Decide power input: dedicated power module vs the current 2-pin screw terminal
  (Crowd Supply suggested a complete module — likely cheaper than an extra assembly step)
• Add a power switch (toggle, retro feel) — decide mounting face + orientation

Docs

• Update BOM, schematic, build guide for the new rev

[engmung]

Simplified rev: remove debounce RC, keep decoupling caps

[engmung]

⚡ Update: Simplified Rev Testing & Encoder Swap Results

The simplified revision board (with debounce RC filters removed, decoupling caps retained) has been fabricated and fully tested.

Results:

• General Functionality: Everything works flawlessly. The board is highly stable.
• Rotary Encoder Test (PEC11R-4220F-S0024): * The official Bourns encoders are successfully populated. Physical stability and tactile response are excellent.
  • ⚠️ Issue: The rotation direction is inverted compared to the previous AliExpress clone encoders.
  • Solution: Since the hardware pinout itself is fine, we will handle this via a firmware configuration update rather than spinning a new PCB layout.

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