# ESP32-2432S028R Quick Reference Card

## 🎯 Quick Start
1. Connect USB-C cable
2. Display shows touchscreen UI
3. Tap [POWER] to turn ON (green)
4. Use slider to control speed
5. Tap [DIR] to change direction

## 📱 UI Button Guide

```
┌──────────────────────────────────────┐
│ [POWER] [MODE] [RAILS] [DIR]        │
└──────────────────────────────────────┘
```

### [POWER] Button
- **Green** = Power ON → Motor/DCC active
- **Red** = Power OFF → No output
- Tap to toggle

### [MODE] Button
- **Cyan** = DCC Digital mode
- **Yellow** = DC Analog mode
- ⚠️ **Auto powers OFF when switching!**

### [RAILS] Button
- **2-Rail** = Standard configuration (relay OFF)
- **3-Rail** = Center rail mode (relay ON)
- Relay clicks when toggling

### [DIR] Button
- **FWD** = Forward direction
- **REV** = Reverse direction
- Changes immediately if powered

### Speed Slider
- Drag white knob OR tap anywhere on slider
- Range: 0-100%
- Real-time updates

## ⚡ Pin Quick Reference

| Function | GPIO | External Connection |
|----------|------|---------------------|
| PWM/DCC_A | 18 | LM18200 PWM (dual purpose) |
| DIR/DCC_B | 19 | LM18200 DIR (dual purpose) |
| Motor BRAKE | 23 | LM18200 BRAKE |
| Relay | 4 | Relay Module IN |
| Ground | GND | All GNDs |

## 🔒 Safety Features

✅ **Auto Power-Off**: Switching DCC↔Analog automatically turns power OFF  
✅ **Emergency Stop**: Tap [POWER] button for immediate stop  
✅ **Settings Saved**: All configurations persist after reboot  

## 🚨 Important Notes

- **Always power OFF before switching modes** (automatic)
- **DCC requires booster circuit** (ESP32 outputs logic-level only)
- **Motor controller handles high current** (not ESP32 directly)
- **Common ground required** for all external circuits

## 🛠️ Default Settings

- **DCC Address**: 3 (change in code)
- **Power**: OFF on startup
- **Mode**: DC Analog
- **Rails**: 2-Rail
- **Speed**: 0%
- **Direction**: Forward

## 📊 Serial Monitor Commands

Baud rate: **115200**

Watch for:
- Configuration loaded
- Relay Controller initialized
- Touchscreen UI initialized
- Mode changes
- Power state changes

## 🔄 Factory Reset

To reset all settings:
1. Flash firmware with PlatformIO
2. Settings will revert to defaults
3. Or call `config.reset()` in code

## 📞 Troubleshooting Quick Fixes

| Problem | Quick Fix |
|---------|-----------|
| Touch not working | Adjust calibration in code |
| Display blank | Check USB power |
| Motor not running | Check power is ON + correct mode |
| Relay not clicking | Verify 5V power to relay |
| Settings not saving | Check NVS partition |

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**Tip**: Keep this card handy near your test bench!