# Wiring Diagram

## LM18200 H-Bridge Connection

```
ESP32 D1 Mini                    LM18200                      Track/Motor
                                                               
GPIO 25 (PWM)  ──────────────►  PWM                          
GPIO 26 (DIR)  ──────────────►  DIR                          
GPIO 27 (BRAKE)──────────────►  BRAKE                        
                                                              
5V             ──────────────►  Vcc                          
GND            ──────────────►  GND                          
                                                              
                                VS    ◄─────────  12-18V Power Supply (+)
                                GND   ◄─────────  Power Supply GND
                                                              
                                OUT1  ──────────► Track Rail 1
                                OUT2  ──────────► Track Rail 2
```

## DCC Signal Output (Optional Booster Required)

```
ESP32 D1 Mini                    DCC Booster                 Track
                                                              
GPIO 32 (DCC_A) ────────────►   Signal A                    
GPIO 33 (DCC_B) ────────────►   Signal B                    
                                                              
                                Power In  ◄──── 12-18V Supply
                                                              
                                Track A   ──────────► Rail 1
                                Track B   ──────────► Rail 2
```

## WS2812 LED Indicators

```
ESP32 D1 Mini                    WS2812 LEDs
                                                              
GPIO 4 (LED_DATA) ──────────►   DIN                         
5V                ──────────►   VCC                         
GND               ──────────►   GND                         
                                                              
                                LED 0: Power Status
                                  - Green: Power ON
                                  - Red: Power OFF
                                
                                LED 1: Mode Indicator
                                  - Blue (pulsing): DCC mode
                                  - Yellow (pulsing): Analog mode
```

## Complete System Diagram

```
                    ┌─────────────────┐
                    │   Power Supply   │
                    │    12-18V DC     │
                    └────────┬─────────┘
                             │
                    ┌────────┴─────────┐
                    │                  │
            ┌───────▼────────┐  ┌──────▼──────┐
            │   LM18200      │  │  5V Regulator│
            │   H-Bridge     │  │  (if needed) │
            └───────┬────────┘  └──────┬───────┘
                    │                  │
                    │         ┌────────▼────────┐
                    │         │  ESP32 D1 Mini  │
                    │         │                 │
                    │         │  GPIO 25 → PWM  │───┐
                    │         │  GPIO 26 → DIR  │───┤
                    │         │  GPIO 27 → BRAKE│───┤
                    │         │                 │   │
                    │         │  GPIO 32 → DCC A│   │
                    │         │  GPIO 33 → DCC B│   │
                    │         │                 │   │
                    │         │  GPIO 4  → LEDS │───┼──► WS2812 LEDs
                    │         │                 │   │    (Power & Mode)
                    │         │  WiFi (Built-in)│   │
                    │         └─────────────────┘   │
                    │                               │
                    └───────────────────────────────┘
                                    │
                            ┌───────▼────────┐
                            │  Track/Rails   │
                            │                │
                            │  ┌──────────┐  │
                            │  │Locomotive│  │
                            │  └──────────┘  │
                            └────────────────┘
```

## Pin Summary Table

| Function | ESP32 Pin | Device Pin | Notes |
|----------|-----------|------------|-------|
| Motor PWM | GPIO 25 | LM18200 PWM | 20kHz PWM signal |
| Motor Direction | GPIO 26 | LM18200 DIR | High=Forward, Low=Reverse |
| Motor Brake | GPIO 27 | LM18200 BRAKE | Active LOW |
| DCC Signal A | GPIO 32 | DCC Booster A | Requires booster circuit |
| DCC Signal B | GPIO 33 | DCC Booster B | Inverted signal |
| LED Data | GPIO 4 | WS2812 DIN | 2 LEDs for status |
| LED Power | 5V | WS2812 VCC | LED strip power |
| Power (5V) | 5V | LM18200 Vcc | Logic power |
| Ground | GND | LM18200/LEDs GND | Common ground |