Auto Recording Voice Recorder Design
Thought
Work completed:
- All schematic components were placed and configured (ESP32-S3, MEMS mic, microSD, USB-C, buck regulator, ESD/TVS diodes, LED, button, decoupling/bulk caps, CC pull-downs).
- All nets wired: power rails (VBUS→buck→3V3→ESP32/peripherals), USB D+/D– through TVS, I2S (BCLK/LRCLK/DATA), SDMMC (CLK/CMD/D0–D3), CC1/CC2 pull-downs, LED and button controls, decoupling caps on every rail.
- Schematic reviewed: capacitor/resistor ratings set, footprints verified, part availability confirmed, EMI/ESD protection validated.
Outstanding tasks (not done):
- PCB stackup configuration (Standard 4-layer)
- Inner copper layer power planes (3.3 V, GND)
- Ground pours on all layers
- Mounting hole placement considering mechanical constraints
- Net classification and trace-width rule setup
- Component placement on PCB outline
- Auto-routing of USB differential pairs and other signals
- Final ERC/DRC on layout
Success criteria status:
- Schematic meets all requirements for functionality and protection ✅
- PCB layout is partially prepared but not yet complete (stackup, placement, routing pending) ⚠️
- Firmware and MP3/VAD/upload functionality still to be implemented (outside schematic scope)
Next recommended step:
Proceed to the PCB layout phase in Flux:
- Set up the board stackup (Standard 4-layer) and configure inner power/GND planes.
- Enable ground pours on relevant layers.
- Place components within the 70 mm×50 mm outline, respecting antenna keep-out and mechanical constraints.
- Define net classes and trace-width rules before auto-routing.
Flux stopped
