diff --git a/src/SigLed.h b/src/SigLed.h
index bb9b134..cccdec9 100644
--- a/src/SigLed.h
+++ b/src/SigLed.h
@@ -51,6 +51,8 @@ protected:
         LS_RUN, // bezi automat
         LS_WAIT, // cekame v automatu
     } _state; // stav automatu
+    bool _invert = false;
+
     void _init(void);
 
 public:
@@ -58,6 +60,16 @@ public:
     void set(const uint8_t *signal);
     void set_P(PGM_P signal);
     void start(void);
+    void setInvert(bool invert)
+    {
+
+        if (_invert != invert) {
+            _invert = invert;
+            int temp = _ledon;
+            _ledon = _ledoff;
+            _ledoff = temp;
+        }
+    }
     static void lh(SigLED *ptr);
     void rtLed(void); // vykonna metoda
 };