From 5796b28e1a32afb8c9b4816d13b28b1e118b41d5 Mon Sep 17 00:00:00 2001
From: localhorst <localhorst@mosad.xyz>
Date: Tue, 6 Jan 2026 23:02:54 +0100
Subject: [PATCH] improve navigation animation

---
 main/animation.c | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/main/animation.c b/main/animation.c
index 8b0e0e8..9e2e8bf 100644
--- a/main/animation.c
+++ b/main/animation.c
@@ -183,7 +183,12 @@ static void anim_sinelon(void)
 
 static void anim_navigation(void)
 {
-    // Navigation lights: left red, right green
+    // Aviation navigation lights with strobe overlay:
+    // - Red: Port (left) wingtip - steady
+    // - Green: Starboard (right) wingtip - steady
+    // - White strobe: Overlays outer nav lights with bright flashes
+
+    static uint8_t strobe_counter = 0;
     led_clear_all();
 
     uint16_t num_leds_a = led_get_num_leds_a();
@@ -191,22 +196,34 @@ static void anim_navigation(void)
 
     rgb_t red = {255, 0, 0};
     rgb_t green = {0, 255, 0};
+    rgb_t white = {255, 255, 255};
 
-    // Side red (last 3 LEDs of strip A)
+    // Anti-collision strobe pattern: Double flash at ~1 Hz
+    // Flash duration: 3 frames (~50ms) for high-intensity effect
+    bool first_flash = (strobe_counter < 3);
+    bool second_flash = (strobe_counter >= 7 && strobe_counter < 10);
+    bool strobe_active = (first_flash || second_flash);
+
+    // Port (left) - Red navigation light OR white strobe (outer 3 LEDs of strip A)
     if (num_leds_a >= 3)
     {
-        led_set_pixel_a(num_leds_a - 1, red);
+        rgb_t color_a = strobe_active ? white : red;
+        led_set_pixel_a(num_leds_a - 1, color_a);
         led_set_pixel_a(num_leds_a - 2, red);
         led_set_pixel_a(num_leds_a - 3, red);
     }
 
-    // Side green (last 3 LEDs of strip B)
+    // Starboard (right) - Green navigation light OR white strobe (outer 3 LEDs of strip B)
     if (num_leds_b >= 3)
     {
-        led_set_pixel_b(num_leds_b - 1, green);
+        rgb_t color_b = strobe_active ? white : green;
+        led_set_pixel_b(num_leds_b - 1, color_b);
         led_set_pixel_b(num_leds_b - 2, green);
         led_set_pixel_b(num_leds_b - 3, green);
     }
+
+    // Strobe cycle: 90 frames = 1.5 second at 60 FPS
+    strobe_counter = (strobe_counter + 1) % 90;
 }
 
 static void anim_chase(void)