Import led-driver app: pico/ and esp32/ layout

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

pico/src/patterns/transition.py

@@ -0,0 +1,57 @@
+import utime
+
+
+class Transition:
+    def __init__(self, driver):
+        self.driver = driver
+
+    def run(self, preset):
+        """Transition between colors, blending over `delay` ms."""
+        colors = preset.c
+        if not colors:
+            self.driver.off()
+            yield
+            return
+
+        # Only one color: just keep it on
+        if len(colors) == 1:
+            while True:
+                self.driver.fill(self.driver.apply_brightness(colors[0], preset.b))
+                yield
+            return
+
+        color_index = 0
+        start_time = utime.ticks_ms()
+
+        while True:
+            if not colors:
+                break
+
+            # Get current and next color based on live list
+            c1 = colors[color_index % len(colors)]
+            c2 = colors[(color_index + 1) % len(colors)]
+
+            duration = max(10, int(preset.d))  # At least 10ms
+            now = utime.ticks_ms()
+            elapsed = utime.ticks_diff(now, start_time)
+
+            if elapsed >= duration:
+                # End of this transition step
+                if not preset.a:
+                    # One-shot: transition from first to second color only
+                    self.driver.fill(self.driver.apply_brightness(c2, preset.b))
+                    break
+                # Auto: move to next pair
+                color_index = (color_index + 1) % len(colors)
+                start_time = now
+                yield
+                continue
+
+            # Interpolate between c1 and c2
+            factor = elapsed / duration
+            interpolated = tuple(
+                int(c1[i] + (c2[i] - c1[i]) * factor) for i in range(3)
+            )
+            self.driver.fill(self.driver.apply_brightness(interpolated, preset.b))
+
+            yield