Schematic Fixes

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1/3 Audit schematic connectivity and MCU support circuits

Audit schematic connectivity and MCU support circuits

Apply focused schematic fixes

Re-run ERC and verify corrected nets

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Checking Binary Watch Schematic Audit progress…
"Binary Watch Schematic Audit" completed.

flux

The repair pass is complete. I’m independently checking the updated ERC results and the critical MCU, clock, button, LED, and programming nets now.

flux

Schematic issues fixed: added NRST filtering, three button pull-ups, corrected LSE capacitors to 8.2 pF, and marked unused MCU/header pins no-connect. Fresh ERC and passive checks are clean.
Open items: select a real low-leakage Schottky MPN and place/route the four new passives on the PCB. Full details: Schematic Audit Report.
C

cythonicpy

Design-wise, I'd like the diodes to be centered on a circular board, with the battery on the backside

flux

I’ll reorganize the PCB so the LED display is centered and visually balanced on the circular face, with the coin-cell holder moved to the back, then check overlaps and board-edge clearance.

flux

The board is currently a 45 × 38 mm rounded rectangle, with 12 LEDs in two rows and the battery holder on top. I propose a 45 mm circular board, a centered 3 × 4 LED grid on the front, buttons along the right edge, and the CR2032 holder on the back; other circuitry stays around the display where practical.
Confirm this arrangement and I’ll implement the placement.
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Files

Schematic

Layout

3D View

Design Notes
Revised Requirements — Binary Wristwatch
  • Wristwatch form factor with simple 3D-printable case and strap hardware handled mechanically.
  • Replaceable coin-cell battery power, assumed CR2032 unless changed.
  • Simple binary LED display: LEDs should be physically large/bright enough to read as lit bits in a stylized 0/1 layout.
  • LEDs should normally be off; user presses a button to wake/display time for a few seconds to preserve battery.
  • Mostly simple design with some visual flair: recommended layout is two rows or arcs of LED bits, with silkscreen labels or printed case windows.
Architecture
  • CR2032 holder -> reverse-protection / battery rail -> low-power MCU.
  • MCU uses 32.768 kHz crystal for accurate timekeeping, or an external RTC if MCU library availability forces it.
  • LED display driven directly by MCU GPIO through current-limiting resistors at low duty cycle/current.
  • Buttons: DISPLAY/WAKE plus optional SET and MODE buttons for setting time.
  • Programming/debug connector included as pads/header.
Power Budget
Assumptions:
  • CR2032 nominal 3.0 V, typical practical continuous current should stay low; LED display is momentary.
  • Low-power MCU sleep/RTC: target about 12 mA plus MCU active current.
  • Display timeout: 3–5 seconds per button press.
Sizing target:
  • No boost regulator for simplicity; run directly from coin cell where possible.
  • Avoid high LED current to prevent CR2032 voltage sag.
  • Use high-efficiency red/green LEDs rather than blue/white, because blue/white forward voltage may be too high from a depleted coin cell.
Display Encoding Proposal
  • Hours: 4 LEDs for 1, 2, 4, 8 values (12-hour binary-coded value).
  • Minutes: 6 LEDs for 1, 2, 4, 8, 16, 32 values.
  • Optional accent/PM LED if GPIO budget allows.
Design Decisions
  • Prefer a very-low-power MCU such as ATtiny/AVR, PIC, SAMD low-power, or similar available library part.
  • Prefer external 32.768 kHz crystal if the MCU supports it for timekeeping.
  • Use SMD parts by default to keep the watch thin, but choose larger 0805/1206 LEDs for readability and beginner-friendly assembly.

  • Revised Requirements — Binary Wristwatch

  • Architecture

  • Power Budget

  • Display Encoding Proposal

  • Design Decisions