# RM3100 Small Module I2C Clean Project

Locked design:
- PCB size: 16.0mm x 15.7mm
- Connector: 8Pin
- Default bus: I2C for ESP32
- MODE/I2CEN: pulled up to 3V3 through R8 10k
- MISO_TP: kept as test point / future SPI

How to open:
1. Open KiCad first.
2. Use File -> Open Project.
3. Select rm3100_small_module_i2c.kicad_pro.
4. Do not open the .kicad_sch directly first.

Files:
- rm3100_small_module_i2c.kicad_pro: KiCad project
- rm3100_small_module_i2c.kicad_sch: clean single-page schematic draft with embedded symbol cache
- rm3100_small_module_i2c.kicad_pcb: first placement draft, not routed yet
- README_规格.md: Chinese locked specification
- rm3100_small_module_schematic.svg: readable schematic sketch

Status:
- Schematic and PCB placement draft generated.
- PCB is placement-only; routing/Gerber are not ready yet.
- kicad-cli DRC/ERC currently fails on this machine because KiCad cannot load _eeschema.dll, error 126.
