Design a WiFi-enabled water flow meter for a 3/4" PVC pipe with the following specifications:

### Project Requirements

#### **Power Input**
- **USB-C**: 5V (15W) power input with appropriate protection circuitry

#### **Connectivity**
- **WiFi Module**: ESP32 or similar for wireless connectivity and data transmission

#### **Sensing**
- **Ultrasonic Flow Sensor**: External ultrasonic sensor suitable for 3/4" PVC pipe
- Measure flow rate and total volume
- Sensor is powered with 12V and outputs RS485

#### **Power Management**
- **Voltage Regulation**: 3.3V regulator for powering the ESP32 and sensor
- **Protection**: Reverse polarity protection, ESD protection, and decoupling capacitors

#### **Supporting Components**
- **Programming Interface**: UART header for firmware updates
- **Status Indicators**: LEDs for power, WiFi connection, and flow detection
- **Reset Circuit**: Proper enable/reset network for the microcontroller

### Request
Generate a complete schematic with all necessary components, including the power supply, microcontroller, sensor interface, and supporting circuitry.