Initial KiCad project

Midea_ESP/README.md

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+# Midea AC Controller PCB Design
+
+Custom PCB design for controlling Midea/Inventor AC units using ESP32 with BLE beacon capabilities.
+
+## Project Files
+
+- `Midea_ESP.kicad_pro` - KiCad project file
+- `Midea_ESP.kicad_sch` - Schematic file
+- `Midea_ESP.kicad_pcb` - PCB layout file
+- `Midea_ESP.kicad_prl` - Project local settings
+
+## Custom Library
+
+- `libs/Midea_AC_Controller.kicad_sym` - Custom symbol library containing:
+  - ESP32-WROOM-32E
+  - TXB0104PWR (Level shifter)
+  - AMS1117-3.3 (Voltage regulator)
+  - CP2102N (USB-to-Serial - not used, kept for reference)
+
+## Documentation
+
+- **`SCHEMATIC_COMPONENT_LIST.md`** - Complete component list with pin-by-pin connections and schematic structure
+- **`QUICK_START_SCHEMATIC.md`** - Step-by-step guide for building the schematic in KiCad
+- **`PROGRAMMING_HEADER.md`** - Programming header pinout and connection guide
+- **`COMPONENT_SIZES.md`** - Recommended package sizes for all components (capacitors, resistors, LEDs, etc.)
+- **`AC_CONNECTION.md`** - AC connector pinout and connection guide
+
+## Getting Started
+
+1. Open the project in KiCad: `kicad Midea_ESP.kicad_pro`
+2. Follow `QUICK_START_SCHEMATIC.md` to build the schematic
+3. Refer to `SCHEMATIC_COMPONENT_LIST.md` for detailed component information
+4. Use `PROGRAMMING_HEADER.md` when connecting a USB-to-Serial adapter for flashing
+
+## Design Features
+
+- ESP32-WROOM-32E microcontroller
+- 5V to 3.3V voltage regulation (AMS1117-3.3)
+- 3.3V ↔ 5V level shifter (TXB0104PWR) for AC communication
+- Programming header for external USB-to-Serial adapter
+- Reset and boot buttons
+- Status LEDs
+- JST-XH connector (J1) - Provides power input and AC communication
+
+## Power Supply
+
+- **Power Input:** J1 Pin 1 (+5V) - Powers the entire PCB
+- **Voltage Regulator:** AMS1117-3.3 converts 5V to 3.3V for ESP32
+- **Ground:** J1 Pin 4 (GND)
+
+## Cost Optimization
+
+- Uses programming header instead of onboard USB-to-Serial chip (saves ~$2.50 per board)
+- Minimal component count while maintaining functionality
+