David Gwilliam 9fa00dfd11 test ST7789 display ...

1. **Display Driver Upgrade**
   - Replaced simple backlight control with full **Arduino_GFX library** integration
   - Configured ST7789 display controller (172x320, with 34px column offset)
   - Added SPI bus setup for display communication

2. **Visual Feedback Enhancement**
   - Transitioned from binary backlight (ON/OFF) to **full-color screen displays**:
     - **Silent state**: Black screen
     - **Alarm state**: Red/White blinking
     - **Button press**: White screen
     - **Silence confirmed**: Green screen with text
   - Added colored status messages (WiFi errors, silence confirmations)

3. **Display Test Function**
   - New `testDisplay()` cycles through RED → GREEN → BLUE → WHITE → BLACK on startup
   - Verifies display hardware functionality

- **Better user feedback**: Color-coded states and text messages replace simple backlight blinking
- **Easier troubleshooting**: Startup test validates display, WiFi errors shown visually with text
- **Enhanced alarm**: Alternating red/white screens more noticeable than simple blinking
- **Hardware utilization**: Fully leverages the 1.47" color LCD instead of treating it as a simple backlight

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examples

initial commit

2026-02-12 00:45:31 -08:00

libraries

snapshot

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sketches

test ST7789 display

2026-02-16 19:03:32 -08:00

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