Initial backup of LTP-305G matrix clock setup on matrixpi

Captures everything needed to redeploy the two-display clock (hour on I2C
0x61, minute on I2C 0x63) on a fresh Pi:

- Both systemd units (matrix0x61.service, matrix0x63.service)
- Deployed Pimoroni script tree, including the local %I (12-hour) clock
  customization
- Vendored upstream sources (ltp305-python, breakout-garden) so restore is
  fully offline-capable
- Boot config snippet enabling I2C
- install.sh that wires it all back up idempotently
- Inventory doc cross-referencing every live-system path

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

vendor/breakout-garden/examples/uv-warning/uv-warning.py

@@ -0,0 +1,99 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+import time
+import veml6075
+import smbus
+import colorsys
+from PIL import Image
+from PIL import ImageFont
+from PIL import ImageDraw
+from luma.core.interface.serial import spi
+from luma.core.render import canvas
+from luma.oled.device import sh1106
+from rgbmatrix5x5 import RGBMatrix5x5
+
+print("""
+This Pimoroni Breakout Garden example requires a VEML6075 UV
+Breakout, a 5x5 RGB Matrix Breakout, and a 1.12" OLED Breakout (SPI).
+
+The UV-O-Meter 3000 displays UV levels visually and in text.
+
+Press Ctrl+C a couple times to exit.
+""")
+
+# Map UV index to a descriptive level
+
+def uv_to_description(avg_uv_index):
+    if avg_uv_index < 3:
+        return "LOW"
+    elif 3 <= avg_uv_index < 6:
+        return "MEDIUM"
+    elif 6 <= avg_uv_index < 8:
+        return "HIGH"
+    elif 8 <= avg_uv_index < 11:
+        return "V. HIGH"
+    elif avg_uv_index > 11:
+        return "EXTREME"
+    else:
+        return ""
+
+bus = smbus.SMBus(1)
+
+# Set up UV sensor
+uv_sensor = veml6075.VEML6075(i2c_dev=bus)
+uv_sensor.set_shutdown(False)
+uv_sensor.set_high_dynamic_range(False)
+uv_sensor.set_integration_time('100ms')
+
+# Set up RGB matrix
+rgbmatrix5x5 = RGBMatrix5x5()
+rgbmatrix5x5.set_clear_on_exit()
+rgbmatrix5x5.set_brightness(1.0)
+
+# Set up OLED
+oled = sh1106(spi(port=0, device=1, gpio_DC=9), rotate=2, height=128, width=128)
+
+# Load fonts
+rr_path = os.path.abspath(os.path.join(os.path.dirname(__file__), 'fonts', 'Roboto-Regular.ttf'))
+rb_path = os.path.abspath(os.path.join(os.path.dirname(__file__), 'fonts', 'Roboto-Black.ttf'))
+rb_15 = ImageFont.truetype(rb_path, 15)
+rr_15 = ImageFont.truetype(rr_path, 15)
+
+while True:
+    try:
+        img = Image.open("images/uv-warning.png").convert(oled.mode)
+        draw = ImageDraw.Draw(img)
+
+        draw.rectangle([(0, 0), (128, 128)], fill="black")
+
+        # Get UV data and calculate indices
+        uva, uvb = uv_sensor.get_measurements()
+        uv_comp1, uv_comp2 = uv_sensor.get_comparitor_readings()
+        uv_indices = uv_sensor.convert_to_index(uva, uvb, uv_comp1, uv_comp2)
+        uva_index, uvb_index, avg_uv_index = uv_indices
+
+        # Draw UV data to OLED
+        draw.text((0, 0), "UV-O-Meter 3000", fill="white", font=rb_15)
+        draw.text((0, 30), "UVA index:  {:05.02f}".format(uva_index), fill="white", font=rr_15)
+        draw.text((0, 48), "UVB index:  {:05.02f}".format(uvb_index), fill="white", font=rr_15)
+        draw.text((0, 66), "Avg. index:  {:05.02f}".format(avg_uv_index), fill="white", font=rr_15)
+        draw.text((0, 100), "Level: {}".format(uv_to_description(avg_uv_index)), fill="white", font=rb_15)
+
+        # Map avg. UV index to colour, from green to red
+        hue = (10.001 - min(10, avg_uv_index)) / 30
+        sat = 1.0
+        val = 1.0
+        r, g, b = [int(255 * c) for c in colorsys.hsv_to_rgb(hue, sat, val)]
+
+        # Light RGB matrix with calculated colour
+        rgbmatrix5x5.set_all(r, g, b)
+        rgbmatrix5x5.show()
+        oled.display(img)
+
+        # Also print current UV index
+        print ('Avg. UV index: {}'.format(avg_uv_index))
+
+    except KeyboardInterrupt:
+        sys.exit(0)