# 1.8" TFT Display Setup Guide

## Overview
The 1.8" TFT display (128x160) is used as the primary visual interface for the Aniker anchor alarm system. It displays GPS coordinates, anchor status, and alarm conditions.

## Display Specifications

### Technical Details
- Display Type: TFT LCD
- Resolution: 128x160 pixels
- Interface: SPI
- Controller: ST7735 (typical)
- Viewing Angle: ~160°
- Operating Voltage: 3.3V
- Backlight: LED
- Color Depth: 16-bit (65K colors)

### Physical Characteristics
- Screen Size: 1.8 inches diagonal
- Active Area: ~28mm x 35mm
- Module Size: ~34mm x 45mm (approximate)
- Interface: 8-pin connection

## Hardware Setup

### Power Requirements
- Logic Voltage: 3.3V
- Current Draw: ~100mA with backlight on
- Backlight Control: PWM capable

### Pin Connections
1. **Power Pins**
   - VCC → ESP32 3.3V
   - GND → ESP32 GND
   - BLK → ESP32 GPIO4 (Backlight control)

2. **SPI Interface**
   - SCL → ESP32 GPIO18 (SPI Clock)
   - SDA → ESP32 GPIO23 (MOSI)
   - RES → ESP32 GPIO21 (Reset)
   - DC  → ESP32 GPIO22 (Data/Command)
   - CS  → ESP32 GPIO5  (Chip Select)

### Display Orientation
- The display can be mounted in 4 orientations (0°, 90°, 180°, 270°)
- Software configuration available for orientation adjustment
- Default orientation: Portrait (0°)

## Software Integration

### Basic Configuration
```rust
// Example display configuration
let spi = SPIInterface::new(
    spi,
    gpio23,  // MOSI
    gpio18,  // SCK
    gpio5,   // CS
    gpio22,  // DC
    gpio21,  // RST
);

let display = ST7735::new(
    spi,
    gpio4,   // BLK
    false,   // is_inverted
    160,     // height
    128,     // width
);
```

### Display Layout
The screen is organized into several regions: