diff --git a/src/eggTimer.c b/src/eggTimer.c
index ffb503b..d476500 100644
--- a/src/eggTimer.c
+++ b/src/eggTimer.c
@@ -12,9 +12,11 @@
 #include "eggTimer.h"
 #include "displayMuxer.h"
 #include "button.h"
+#include "gpio.h"
 
 
 const uint32_t EGG_TIMER_CYCLE = 1000;
+const uint32_t LED_CYCLE = 250;
 
 const uint8_t COOKING_TIME = 120;
 uint8_t restCookingTime;
@@ -29,6 +31,10 @@ void eggTimerStart(void *handleArg) {
   }
 }
 
+void eggTimerAlarm(void *handleArg) {
+  gpioTogglePin(LED_1);
+}
+
 void eggTimerInit(void *handleArg) {
   restCookingTime = COOKING_TIME;
   timerRunning = false;
@@ -42,6 +48,7 @@ void eggTimerExec(void *handleArg) {
     displayMuxerSetValue(restCookingTime, true, TIMER_MUX);
     if (restCookingTime == 0) {
       // activate alarm
+      schAdd(eggTimerAlarm, NULL, 0, LED_CYCLE);
       timerRunning = false;
     }
   }
diff --git a/src/gpio.c b/src/gpio.c
index 46d5812..4d64ed6 100644
--- a/src/gpio.c
+++ b/src/gpio.c
@@ -77,6 +77,15 @@ void gpioSetPin(tPin p, tPinState v) {
   }
 }
 
+void gpioTogglePin(tPin p) {
+  tPinCfg pin = pinCfg[p];
+  if (pin.portId == PORT1) {
+    P1OUT ^= pin.bit;
+  } else if (pin.portId == PORT2) {
+    P2OUT ^= pin.bit;
+  }
+}
+
 tPinState gpioGetPin(tPin p) {
   tPinCfg pin = pinCfg[p];
   uint16_t pinValue = 0;
diff --git a/src/gpio.h b/src/gpio.h
index 4bef9ea..ffae80c 100644
--- a/src/gpio.h
+++ b/src/gpio.h
@@ -50,12 +50,13 @@ typedef enum {
   DIGIT_0,
   DIGIT_1,
   BUTTON_1,
-  TESTPIN1,
+  LED_1,
   PINS_END
 } tPin;
 
 void gpioInitPins();
 void gpioSetPin(tPin p, tPinState v);
+void gpioTogglePin(tPin p);
 tPinState gpioGetPin(tPin p);