Embryo Heartbeat Detector PCB Design

Worked for 9 mins 54 sec

I started the comprehensive cleanup and got through Phase 1 and Phase 2, then began Phase 3 routing cleanup before execution credits stopped.

Completed in this session:

Phase 1 — Schematic integrity
- Reviewed STM32F303, AFE4404, USB-C, display, SWD, regulator, ESD, crystals, and key passives.
- Marked unused USB-C pins as no-connect: SBU, SuperSpeed TX/RX, and artifact pins.
- Marked AP2112K NC as no-connect.
- Marked unused AFE4404 optional pins as no-connect: CLK, DNC, TX2, TX3.
- Added the missing AFE4404 RX_SUP filter network:
  - R22 10 Ω series filter
  - C20 10 µF
  - C21 100 nF
  - C22 10 nF
  - C23 1 nF
- Rewired U2:RX_SUP through the new filtered rail.
- Reconnected U2:IO_SUP to 3.3 V with local decoupling after the filter edit exposed it as a single-pin net.
Phase 2 — PCB placement review
- Found one new AFE filter capacitor outside the board.
- Replaced only the new AFE RX_SUP filter parts near U2.
- R22, C20, C21, C22, and C23 are now clustered near AFE4404.
- Placement tool reported no overlap or out-of-board problems for the adjusted parts.
Phase 3 — Routing cleanup started
- After placement, old traces around USB-C and the new AFE filter became stale and caused many airwire/overlap reports.
- I deleted stale routing on affected nets:
  - VBUS
  - USB_DP
  - USB_DM
  - USB_CC1
  - USB_CC2
  - 3V3
  - AGND
- This intentionally removed bad/stale copper so those nets can be cleanly rerouted.

Current state:

Schematic is improved but should be re-reviewed.
PCB is not fabrication-ready.
Several major nets have had stale routing removed and now need rerouting.
Gerbers should not be exported yet.

Remaining work:

Re-run DRC/ERC after the stale-route deletion.
Route VBUS, 3V3, AGND, USB D+/D−, CC1/CC2, and the AFE RX_SUP filter nets.
Delete any remaining dangling traces and floating copper.
Re-run review until airwires, dangling traces, floating copper, overlaps, and clearance issues are zero.
Verify analog/digital separation.
Perform manufacturing readiness check.
Wait for your approval before Gerber export.

Continue rerouting

Run ERC/DRC

Prioritize cleanup

Check AFE filter

Verify USB-C wiring

J1 D- - J1 D-

R12 P2 - J2 4

R16 P2 - LED1 A

R13 P2 - J2 5

U1 PC15-OSC32_OUT(PC15) - Y2 P2

U1 PC14-OSC32_IN(PC14) - Y2 P1

U1 VDD_1 - C4 P1

R14 P2 - J2 6

J1 D+ - J1 D+

J2 10 - Q1 D

LED2 B - R19 P1

SW1 2 - R5 P1

J1 VBUS - J1 VBUS

U1 PC5 - J2 8

LED2 G - R18 P1

U1 VDD_1 - C4 P1

J1 D+ - J1 D+

U1 VDD_1 - C4 P1

J1 VBUS - J1 VBUS

U1 VDD_1 - C4 P1

J2 10 - Q1 D

U1 VDD_1 - C4 P1

R18 P2 - U1 PC9

D1 I/O2 - U1 PA11

R17 P2 - U1 PC8

U1 NRST - R4 P1

D1 I/O1 - U1 PA12

J1 D- - J1 D-

SW2 2 - R6 P1

R11 P2 - J2 3

J1 D- - J1 D-

J1 CC1 - R1 P1

R15 P2 - J2 7

J1 VBUS - C1 P1

J1 CC2 - R2 P1

U1 BOOT0 - R3 P1

J1 VBUS - C1 P1

J1 D+ - J1 D+

U1 VDD_1 - C4 P1

U1 PA1 - Q1 G

U1 VDD_1 - C4 P1

GND

U1 VSS_3 - U1 VSS

GND

J2 1 - J2 MP1

GND

U1 VSS_3 - U1 VSS

J2 MP2 - Q1 S

SW2 4 - LED1 K

GND

J2 MP2 - Q1 S

GND

LED1

SW1

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Project Name

OVA Pulse Embryo Heartbeat Detector

Description

4-layer STM32F303 + AFE4404 photoplethysmography detector for embryo heartbeat sensing through eggshell, with USB-C power/data, TFT display, optical FFC interface, low-noise analog layout constraints, and manufacturing-ready outputs.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Arrow	$10.80–$14.28
Digi-Key	$14.00–$15.53
HQonline	$8.98–$9.07
LCSC	$15.81–$15.99
Mouser	$20.71
TME	$13.61
Verical	$10.58–$90.01

Controls

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