Add led test

pico/test/leds.py

@@ -0,0 +1,32 @@
+from ws2812 import WS2812B
+import time
+
+
+# --- Rainbow pattern (outside ws2812): pregen double buffer, show via head offset ---
+
+
+# --- Strips + rainbow buffers per strip ---
+
+strips = []
+pins = ((2, 291), 
+        (3, 290), 
+        (4, 283), 
+        (7, 278),
+        (0, 275), 
+        (28, 278),
+        (29, 283),
+        (6, 290))
+
+sm = 0
+
+for pin, num_leds in pins:
+    print(pin, num_leds)
+    ws = WS2812B(num_leds, pin, sm, brightness=1.0)  # 1.0 so fill() is visible
+    strips.append(ws)
+    sm += 1
+    ws.fill((255,0,0))
+    ws.show()
+    time.sleep(1)
+   
+
+