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/seismograph/seismograph.py

@@ -0,0 +1,122 @@
+#!/usr/bin/env python3
+
+import os
+import time
+import sys
+
+try:
+    from PIL import Image
+    from PIL import ImageFont
+    from PIL import ImageDraw
+except ImportError:
+    print("""This example requires PIL.
+Install with: sudo apt install python{v}-pil
+""".format(v="" if sys.version_info.major == 2 else sys.version_info.major))
+    sys.exit(1)
+
+from lsm303d import LSM303D
+from threading import Thread
+from luma.core.interface.serial import spi
+from luma.core.render import canvas
+from luma.oled.device import sh1106
+
+print("""This Pimoroni Breakout Garden example requires an
+LSM303D 6DoF Breakout and a 1.12" OLED Breakout (SPI).
+
+The Dino-Detect v1.2 beta is a dino stomp detector. It's a
+UNIX system, I know this.
+
+Press Ctrl+C to exit.
+""")
+
+# 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'))
+print(rr_path)
+rb_path = os.path.abspath(os.path.join(os.path.dirname(__file__), 'fonts', 'Roboto-Black.ttf'))
+rr_24 = ImageFont.truetype(rr_path, 24)
+rb_20 = ImageFont.truetype(rb_path, 20)
+rr_12 = ImageFont.truetype(rr_path, 12)
+
+# Set up LSM303D motion sensor
+
+lsm = LSM303D(0x1d)
+
+samples = []
+points = []
+
+sx, sy, sz = lsm.accelerometer() # Starting values to zero out accelerometer
+
+sensitivity = 5 # Value from 1 to 10. Determines twitchiness of needle
+
+# Function to thread accelerometer values separately to OLED drawing
+
+def sample():
+    while True:
+        x, y, z = lsm.accelerometer()
+
+        x -= sx
+        y -= sy
+        z -= sz
+
+        v = y # Change this axis depending on orientation of breakout
+
+        # Scale up or down depending on sensitivity required
+
+        if v < 0:
+            v *= (100 * sensitivity)
+        else:
+            v *= (40 * sensitivity)
+
+
+        # Only keep 96 most recent values in list
+
+        points.append(v)
+        if len(points) > 96:
+            points.pop(0)
+
+        time.sleep(0.05)
+
+# The thread to measure acclerometer values
+
+t = Thread(target=sample)
+t.daemon = True
+t.start()
+
+# Wait for at least one data oint
+
+while len(points) == 0:
+    pass
+
+# The main loop that draws values to the OLED
+
+while True:
+    background = Image.open("images/seismograph.png").convert(oled.mode)
+    draw = ImageDraw.ImageDraw(background)
+
+    draw.line([(128, 64), (96, 64 + points[-1])], fill="white")
+    draw.line([(128, 63), (96, 64 + points[-1])], fill="white")
+    draw.line([(128, 65), (96, 64 + points[-1])], fill="white")
+
+    # Draw the seismograph trace
+
+    for i in range(1, len(points)):
+        draw.line([(i - 1, 64 + points[i - 1]), (i, 64 + points[i])], fill="white")
+
+    # Draw the Dino-Detect "branding"
+
+    draw.rectangle([(0, 0), (128, 20)], fill="black")
+    draw.text((0, 1), "AUS (A UNIX System)", fill="white", font=rr_12)
+    draw.line([(0, 20), (128, 20)], fill="white")
+
+    draw.rectangle([(0, 108), (128, 128)], fill="black")
+    draw.text((0, 110), "Dino-Detect v1.2 BETA", fill="white", font=rr_12)
+    draw.line([(0, 108), (128, 108)], fill="white")
+
+    # Display on the OLED
+
+    oled.display(background)