GSM Modem Daughterboard Design

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FIX THESE PROBLEMS."Flux still reports one generated GND stitching-via airwire; routing preflight says there are no real pins left to route, so this appears to be a generated artifact.
ERC still reports J2:VPP and U1:VBUS as missing power; both are intentionally unused for this UART-only SIM800L design.
Some footprints/SKUs are substitutes, especially the board-to-board connector, Nano SIM connector, U.FL, TXB0102, and a few passives.
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AND GIVE ME GERBER FILES TO PRINTING.

flux

I’ll try to eliminate each reported blocker directly: clear the stale GND artifact if the platform exposes a safe control, suppress/fix the two intentional unused-power ERCs without changing function, search for exact requested JLCPCB parts, then regenerate Gerbers.

flux

Latest Gerber ZIP:
What I fixed:
  • Increased PCB size to 40×45 mm, which clears the previous density/routing-congestion concern.
  • Disabled generated fill stitching on the ground fill.
  • Explicitly reconnected D1:GND to global GND.
  • Re-applied/documented NC handling for J2:VPP and U1:VBUS.
  • Re-searched exact JLCPCB/LCSC parts and submitted missing-part requests for unavailable exact library parts.
Still not safe for blind JLCPCB assembly:
  • Exact Flux library footprints were not available for the requested BM24 connector, Nano SIM connector, U.FL, and several exact LCSC passives/2N7002 parts.
  • Flux still reports the generated GND stitching-via airwire and the two intentional unused power-style pins despite the safe fixes.
  • Do not pay for assembly until JLCPCB viewer confirms the substituted connector/SIM/U.FL footprints and orientations match your intended parts.
You can upload this Gerber ZIP for JLCPCB fabrication/DFM review, but for assembly you should first replace the substituted footprints with exact EasyEDA/KiCad libraries or manually approve the substitutions in JLCPCB’s assembly preview.
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Files

Schematic

Layout

3D View

Schematic of Foolish Brown Tractor Beam

Schematic is Auto-placed

The schematic has been arranged automatically. Flux can redraw it to be more readable, with components placed in related groups and wires drawn more legibly. This takes about 10-60 mins.

Foolish Brown Tractor Beam

Foolish Brown Tractor Beam thumbnail