PCB Design for Drowsiness Detection

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Work done
  • Documented the project architecture and saved the ECG signal-chain design intent, including the 50 Hz notch requirement and low-noise analog strategy.
  • Added and configured the core schematic parts: IC1, U1, U2, J1, plus the passive network R1 through R11 and C1 through C10.
  • Wired the ECG front end with RA/LA/RL electrode connections, a regulated 3.3 V analog rail, midrail reference generation, AD8232 support connections, a 50 Hz twin-T notch network, and a conditioned ECG output at C4/R7.
  • Set layout constraints for a 70 mm x 50 mm rectangular 4-layer layout, applied conservative trace/keep-out rules, annotated nets, grouped the design for placement, and prepared initial placement flow with the connector J1 locked.
  • Updated project-level documentation with detailed design notes and a component summary.
Success criteria review
  • ✅ The schematic now contains a connected IC1 ECG front end, electrode interface via J1, supporting regulation through U2, and a 50 Hz notch/filtering network around U1.
  • ✅ The layout has been initialized with low-noise-oriented constraints: 4-layer stackup, board outline, analog-friendly trace/clearance rules, and staged placement setup.
  • ✅ Project description and design documentation were updated to reflect the ECG drowsiness detection purpose and signal-conditioning requirements.
  • ❌ The PCB is not yet fully routed: DRC still reports airwires, which require the human to run Auto-Layout or complete routing manually.
Next steps The next step is PCB routing and final placement cleanup, especially around IC1, U1, and the electrode connector J1. If you want, I can next help you optimize placement guidance for the analog section or review the routed layout after you run Auto-Layout.
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