Project File Analysis Request
0:00
Work done
- Audited the main schematic connectivity and confirmed the implemented signal path around U1, U2, IC1, U3, U4, U5, U6, Q1, FB1, J1, D1, D2, and L1.
- Confirmed key nets are present and named:
VBAT,V3P3,V3P3_A,V12,PIEZO_NODE,RX_IN,RX_STAGE1_OUT,RX_STAGE2_IN,RX_STAGE2_OUT,ENV_FILT,ADC_ENV,I2C_SCL,I2C_SDA,TMP117_ALERT,USB_5V,CC1, andCC2. - Identified unresolved schematic cleanup items: R19, R23, R24, C19, C22, and C23 still have floating terminals, and U5 still shows an unresolved local net (
Net 1) plus R14 onNet 3. - Confirmed documented intentional exceptions: some spare GPIOs on U1 and USB data/SBU pins on J1 were intentionally left NC; the charge-status outputs on U2 and LED implementation were acknowledged but not finalized.
- Renamed the project to ESP32-S3 Piezo TX RX Board.
- Verified the board is configured as 2-layer, but current placement still violates the plan: the overall placed-component span is about 49.52 x 109.8 mm, well outside the required 50 x 50 mm envelope.
- Verified manufacturability is not yet release-ready: no missing footprints were reported, but L1 remains a generic inductor and DRC still reports 97 airwires.
Success criteria review
- ❌ Complete schematic with unintended opens resolved: not met. Several floating support parts remain and at least two anonymous local nets (
Net 1,Net 3) still indicate unfinished RX/envelope wiring. - ❌ Design converged inside 50 x 50 mm with mixed-signal placement constraints: not met. Current placement height is about 109.8 mm.
- ❌ ERC/DRC resolved or intentionally exempted and documented: not met. ERC warnings remain and DRC still shows 97 airwires.
- ❌ Export-ready manufacturing package: not met, because the layout is not yet placement/routing complete.
Next steps
I reached the limit of what I can finish autonomously here. The remaining work depends on PCB placement and routing operations I cannot perform directly in-chat. After the layout is compacted into 50 x 50 mm and the airwires are routed, I can continue with final schematic cleanup, update Design Notes, re-check ERC/DRC, and prepare manufacturing exports.
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Design Notes
System Summary
Compact 2-layer ESP32-S3 piezo TX/RX board targeting a 40 mm to 60 mm PCB. The design uses a shared piezo node for 3 MHz transmit and receive, LiPo charging from USB 5 V, 3.3 V regulation with separated analog rail, a boosted transmit rail near 12 V, and a protected 2-stage analog receive chain.
Architecture Decisions
- Main controller: ESP32-S3-MINI-1 module.
- Charger: TP4056 from USB 5 V to single-cell LiPo.
- Main 3.3 V rail: TLV75533.
- Analog 3.3 V rail: ferrite bead isolated from 3V3_MAIN.
- TX rail: boost converter to approximately 12 V with pulsed-load support.
- TX driver: low gate charge NMOS low-side pulser with gate resistor and pulldown.
- Shared transducer node: PIEZO_NODE.
- RX input protection: series resistor, Schottky clamps to 3V3_ANALOG and AGND, small shunt capacitor.
- RX front end: two OPA836 stages with mid-supply bias around 1.65 V, envelope detection, low-pass filter, and ADC feed.
- Sensor: TMP117 on I2C with 4.7k pull-ups.
- Grounding: AGND and DGND partitioned with single star connection near RX front end.
Initial Layout Intent
- Piezo/transducer connector centered.
- OPA836 receive chain within 10 mm of PIEZO_NODE.
- Boost converter and TX switching loop far from RX front end.
- ESP32 and digital support parts grouped in digital region.
- Decoupling capacitor placed at each IC supply pin.
Implemented Schematic Blocks
- ESP32-S3-MINI-1 main controller added as the digital core.
- USB-C 5 V input added with dual 5.1k CC resistors for sink configuration.
- TP4056 charger connected to the USB input and battery rail.
- TLV75533 low-noise 3.3 V regulator added with a ferrite-bead isolated analog rail.
- MP3437 boost converter stage added for the approximately 12 V transmit rail.
- AO3400A NMOS, gate resistor, and pulldown added for TX pulsing.
- Shared PIEZO_NODE, Schottky clamps, series RX resistor, and small shunt capacitor added.
- Two OPA836 receive stages, mid-supply bias network, envelope detector, and ADC interface added.
- TMP117 sensor connected to the ESP32 I2C bus with 4.7k pull-ups.
Current Review Status
- Layout canvas is set to 50 mm x 50 mm, 2-layer.
- The schematic still needs cleanup for several intentionally unused or not-yet-tied pins, especially spare ESP32 GPIOs, USB data pins, TP4056 status pins, and a few RX/LED support parts.
- PCB placement is still in the default spread-out state and must be re-arranged to satisfy the mixed-signal partitioning constraints.
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