Admin user editing, knight-rider demos, self-contained user seeds

Co-authored-by: Cursor <cursoragent@cursor.com>

workspace/code/pattern_chase_demo.py

@@ -1,16 +1,79 @@
-"""Chase pattern demo using led_patterns helpers."""
+"""Knight Rider–style bouncing scanner — self-contained (stdlib + simulated hardware only)."""
+
+import time
 
 from machine import Pin
 import neopixel
-import time
 
-from led_patterns import chase_frame
+# --- helpers
 
 
-np = neopixel.NeoPixel(Pin(4), 24)
+def _clamp(channel: int) -> int:
+    return max(0, min(255, int(channel)))
 
-for frame in range(120):
-    frame_colors = chase_frame(len(np), frame, color=(0, 220, 255), tail=(0, 40, 55))
+
+def _bounce_head_index(led_count: int, frame: int) -> int:
+    if led_count <= 1:
+        return 0
+    span = led_count - 1
+    cycle = span * 2
+    if cycle <= 0:
+        return 0
+    t = frame % cycle
+    return t if t <= span else 2 * span - t
+
+
+def _bounce_phase_tail_direction(led_count: int, frame: int) -> int:
+    if led_count <= 1:
+        return -1
+    span = led_count - 1
+    cycle = span * 2
+    if cycle <= 0:
+        return -1
+    t = frame % cycle
+    if t <= span:
+        return -1
+    return 1
+
+
+def knight_rider_scanner_frame(
+    led_count: int,
+    frame: int,
+    head_color=(220, 0, 28),
+    tail_len: int = 8,
+    falloff_gamma: float = 2.6,
+):
+    if led_count <= 0:
+        return []
+    out = [(0, 0, 0) for _ in range(led_count)]
+    tl = max(1, tail_len)
+    head = _bounce_head_index(led_count, frame)
+    direc = _bounce_phase_tail_direction(led_count, frame)
+    gamma = max(1.05, falloff_gamma)
+    for rk in reversed(range(tl)):
+        idx = head + direc * rk
+        if idx < 0 or idx >= led_count:
+            continue
+        w = max(0.0, float(tl - rk) / float(tl))
+        strength = w**gamma
+        out[idx] = tuple(_clamp(int(head_color[ch] * strength)) for ch in range(3))
+    return out
+
+
+# --- demo
+
+NUM_LEDS = 16
+
+np = neopixel.NeoPixel(Pin(4), NUM_LEDS)
+
+for frame in range(200):
+    frame_colors = knight_rider_scanner_frame(
+        len(np),
+        frame,
+        head_color=(220, 0, 36),
+        tail_len=10,
+        falloff_gamma=2.85,
+    )
     for i, color in enumerate(frame_colors):
         np[i] = color
     np.write()