v1: Live ADS-B radar with detail panel, units, legend, proximity LED alert

src/led_alert.cpp

@@ -0,0 +1,43 @@
+#include "led_alert.h"
+
+namespace LedAlert {
+
+namespace {
+    constexpr uint8_t PIN_RED   = 4;
+    constexpr uint8_t PIN_GREEN = 16;
+    constexpr uint8_t PIN_BLUE  = 17;
+    constexpr uint32_t BLINK_INTERVAL_MS = 400;
+
+    bool initialized = false;
+    bool blinkState = false;
+    uint32_t lastToggleMs = 0;
+}
+
+void begin() {
+    pinMode(PIN_RED, OUTPUT);
+    pinMode(PIN_GREEN, OUTPUT);
+    pinMode(PIN_BLUE, OUTPUT);
+    digitalWrite(PIN_RED, HIGH);   // aus (LED ist active-low)
+    digitalWrite(PIN_GREEN, HIGH); // aus
+    digitalWrite(PIN_BLUE, HIGH);  // aus
+    initialized = true;
+}
+
+bool update(bool active, uint32_t nowMs) {
+    if (!initialized) begin();
+
+    if (!active) {
+        digitalWrite(PIN_GREEN, HIGH); // aus
+        blinkState = false;
+        return false;
+    }
+
+    if (nowMs - lastToggleMs >= BLINK_INTERVAL_MS) {
+        lastToggleMs = nowMs;
+        blinkState = !blinkState;
+        digitalWrite(PIN_GREEN, blinkState ? LOW : HIGH); // LOW = an, volle Helligkeit (kein PWM noetig)
+    }
+    return blinkState;
+}
+
+}