Opengrill sensor

OpenGrill Sensor Board — KiCad Project

Generated by ../generator/gen_kicad.py (KiCad 6 file format). Do not hand-edit the .kicad_sch / .kicad_pcb here without also updating the generator — the generator is the source of truth and re-running it overwrites these files.

State of this design — read before ordering

Done:

• Complete netlist (matches ../netlist.md, incl. the corrected ADS1115 pins: 9 = SDA, 10 = SCL)
• All components placed per the layout blueprint
• GND zones on F.Cu + B.Cu (fill them in the tool: B in KiCad)
• Machine-checked: netlist cross-verified against the spec, pad-to-pad clearance ≥ 0.15 mm, all pads inside the outline, files parse and round-trip in kiutils

Deliberately NOT done (your steps):

1. Signal routing — ~28 airwires remain. Open the board, fill zones, and route with the interactive router (~20 min). Left unrouted because blind text-authored routing risks silent shorts; the ratsnest + push-shove router does this safely.
2. Run real ERC + DRC in KiCad or EasyEDA Pro after import. The generator's checks are geometry arithmetic, not a full DRC.

Mounting holes — REQUIRED, positions placeholder

Four M3 mounting holes (H1–H4) are included — required to fasten the board to the Tough EXT standoffs. They are isolated NPTH (no-net copper keep-out ring, so the GND pour stays clear — no ground under the screw head; avoids ground loops on this analog board). ⚠ Their positions are placeholders (corners, 4 mm inset) until the Tough EXT envelope is measured — drag them to the real standoff coordinates in EasyEDA before ordering.

⚠ Verify before fabrication (can damage hardware if wrong)

1. J1 (M-BUS 2×15) position and pin-1 orientation. I placed it on the left edge, vertically centred, pin 1 top-left — a plausible position, not a measured one. Measure the stock EXT board: connector X/Y relative to board edges, and which corner is pin 1. If pin 1 is mirrored, 5 V lands on the wrong pins. Adjust (at …) of J1 (or the generator's COMPONENTS table) to the measured position.
2. Corner notches are r = 3.5 mm quarter-circles, assumed from the M5Stack module family style. Verify against the stock EXT board.
3. J1 mating connector part: source a 2×15 2.54 mm male pin header (pins up into the Tough's female M-BUS socket) with enough mating length — measure/salvage from the stock EXT board or buy M5Stack's M-BUS socket kit. No LCSC number given on purpose.

BOM

Footprints accept both hand-soldering (prototype) and JLCPCB SMT (production).

Importing

EasyEDA Pro (free, recommended — Std edition does not import KiCad 6): File → Import → KiCad, select the .kicad_sch and .kicad_pcb. Then route, DRC, and order via the built-in JLCPCB flow.

KiCad 6/7/8/9 (also free): open opengrill-sensor.kicad_pro directly. Fill zones (B), route the airwires, run DRC, then File → Fabrication Outputs → Gerbers — or upload the .kicad_pcb straight to JLCPCB, which accepts it natively.

Regenerating

python3 hardware/pcb/generator/gen_kicad.py

Edit the COMPONENTS table / EXPECTED_NETS in the generator to change the design; the script fails loudly if the emitted netlist stops matching the expected one.