See it work

I need a battery-powered WiFi environmental sensor board. ESP32-S3-WROOM-1-N8R2 module, BME280 over I2C, a 1S 500 mAh LiPo charged over USB-C, 3.3 V from an LDO, one LED and one button, 4× M2 holes. No bigger than 50 × 40 mm, 2 layers. Build quantity 100, everything in stock at Digi-Key or Mouser, unit BOM under $18.

1. 00 Ingest ingest

   Reads the prompt and any spec documents you uploaded.

2. 01 Formalize formalizeQuick confirm

   Turns the brief into a BoardSpec: env-sensor-rev-a, 2 layers, 50 × 40 mm at most, M2 holes. It can ask up to five questions.

   Q1. Should the I2C bus also be exposed on an expansion connector (e.g. Qwiic/JST-SH)?

   Suggested: “No - onboard sensor only for rev A.”

   Confirm BoardSpec

3. 02 Architecture architecture

   Splits the board into blocks: blk_usb, blk_charger, blk_battery, blk_power_reg, blk_mcu, blk_sensor, blk_led_ui. Rails go VBUS 5 V → VSYS 4.2 V → 3V3.

4. 03 Component search component_search

   Finds parts through Nexar, Digi-Key and Mouser, and drops anything without 5× the build quantity in stock: ESP32-S3-WROOM-1-N8R2, BME280, MCP73831T-2ACI/OT, AP2112K-3.3TRG1, TYPE-C-31-M-12.

5. 04 Circuit synthesis circuit_synthesis

   Works out the supporting parts for each block, like the 5.1k pull-downs on CC1 and CC2.

6. 05 Schematic schematic

   Writes the KiCad schematic and runs kicad-cli sch erc --format json.

7. 06 Schematic review schematic_reviewRequired review

   Your review, with the BOM priced live, an explanation for each block, and risk flags like Low stock or Single source.

   ExplanationsBOMRisksComments

   Comment

   Approve & build board Request changes

   Request changes needs at least one comment. After approval, Tracgen carries on by itself. No further input is needed unless verification finds a critical issue.

8. 07 Board setup board_setup

   Footprints, board outline, stackup and netlist sync.

9. 08 Placement placement

   A hints agent suggests where parts go, then a deterministic annealer places them.

10. 09 Routing routing

    Writes a Specctra DSN and runs freerouting on it (-de board.dsn -do board.ses), then rips up and re-routes any nets that fail DRC.

11. 10 Verification verification

    kicad-cli pcb drc has to come back with zero errors. Then netlist equivalence, rail continuity, and an AI design review.

12. 11 Outputs outputs

    Gerbers, Excellon drill, BOM, pick-and-place, PDFs and renders, zipped as <project>-rev<r>-fab.zip.