diff --git a/avr/modules/led_simple/main.asm b/avr/modules/led_simple/main.asm
index 3cb5a2d..6562eb3 100644
--- a/avr/modules/led_simple/main.asm
+++ b/avr/modules/led_simple/main.asm
@@ -1,5 +1,5 @@
 ; ***************************************************************************
-; copyright   : (C) 2023 by Martin Preuss
+; copyright   : (C) 2026 by Martin Preuss
 ; email       : martin@libchipcard.de
 ;
 ; ***************************************************************************
@@ -8,6 +8,24 @@
 ; ***************************************************************************
 
 
+; ***************************************************************************
+; defines
+
+.equ LED_SIMPLE_LED_FAST_REPEATS     = 20
+.equ LED_SIMPLE_LED_FAST_ONTIME      = 2
+.equ LED_SIMPLE_LED_FAST_OFFTIME     = 2
+
+
+.equ LED_SIMPLE_LED_ACTIVITY_REPEATS = 1
+.equ LED_SIMPLE_LED_ACTIVITY_ONTIME  = 3
+.equ LED_SIMPLE_LED_ACTIVITY_OFFTIME = 5
+
+
+.equ LED_SIMPLE_LED_ID_REPEATS       = 30
+.equ LED_SIMPLE_LED_ID_ONTIME        = 5
+.equ LED_SIMPLE_LED_ID_OFFTIME       = 5
+
+
 
 ; ***************************************************************************
 ; data
@@ -17,6 +35,7 @@
 ledSimpleTimer:      .byte 1
 ledSimpleOnTime:     .byte 1
 ledSimpleOffTime:    .byte 1
+ledSimpleRepeat:     .byte 1
 
 
 
@@ -50,7 +69,7 @@ LedSimple_Init:
 ; ---------------------------------------------------------------------------
 ; @routine LedSimple_Every100ms @global
 ;
-; @clobbers r16
+; @clobbers r16, r18, r19, r20
 
 LedSimple_Every100ms:
   lds r16, ledSimpleTimer
@@ -65,10 +84,21 @@ LedSimple_Every100ms_zero:
   lds r16, ledSimpleOffTime
   rjmp LedSimple_Every100ms_setTimer
 LedSimple_Tick_isOff:
+  lds r16, ledSimpleRepeat
+  tst r16
+  breq LedSimple_Tick_restartTimer
+  dec r16
+  sts ledSimpleRepeat, r16
+  brne LedSimple_Tick_restartTimer
+  ; repeat counter reached 0, enter heartbeat mode
+  rcall LedSimple_SetDefaultTiming
+  rjmp LedSimple_Every100ms_ret
+LedSimple_Tick_restartTimer:
   cbi LED_SIMPLE_PORT, LED_SIMPLE_PINNUM ; on
   lds r16, ledSimpleOnTime
 LedSimple_Every100ms_setTimer:
   sts ledSimpleTimer, r16
+LedSimple_Every100ms_ret:
   ret
 ; @end
 
@@ -78,12 +108,12 @@ LedSimple_Every100ms_setTimer:
 ; @routine LedSimple_SetDefaultTiming @global
 ;
 ; Set default timing for LED.
-; @clobbers R18, R19
-;
+; @clobbers R18, R19, R20
 
 LedSimple_SetDefaultTiming:
   ldi r18, LED_SIMPLE_ONTIME
   ldi r19, LED_SIMPLE_OFFTIME
+  clr r20
   rjmp LedSimple_SetTiming
 ; @end
 
@@ -93,23 +123,55 @@ LedSimple_SetDefaultTiming:
 ; @routine LedSimple_SetFastTiming @global
 ;
 ; Set fast blinking timing for LED. Switch LED on.
-; @clobbers R18, R19
-;
+; @clobbers R18, R19, R20
 
 LedSimple_SetFastTiming:
   ldi r18, 5
   ldi r19, 3
+  ldi r20, LED_SIMPLE_LED_FAST_REPEATS
   rjmp LedSimple_SetTiming
 ; @end
 
 
 
+; ---------------------------------------------------------------------------
+; @routine LedSimple_SignalId @global
+;
+; Set ID timing for LED (used to id a device).
+; @clobbers R18, R19, R20
+
+LedSimple_SignalId:
+  ldi r18, LED_SIMPLE_LED_ID_ONTIME
+  ldi r19, LED_SIMPLE_LED_ID_OFFTIME
+  ldi r20, LED_SIMPLE_LED_ID_REPEATS
+  rjmp LedSimple_SetTiming
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine LedSimple_SignalActivity @global
+;
+; Set ID timing for LED (used to id a device).
+; @clobbers R18, R19, R20
+
+LedSimple_SignalActivity:
+  ldi r18, LED_SIMPLE_LED_ACTIVITY_ONTIME
+  ldi r19, LED_SIMPLE_LED_ACTIVITY_OFFTIME
+  ldi r20, LED_SIMPLE_LED_ACTIVITY_REPEATS
+  rjmp LedSimple_SetTiming
+; @end
+
+
+
+
 ; ---------------------------------------------------------------------------
 ; @routine LedSimple_SetTiming @global
 ;
 ; Set blinking timing for LED. Switch LED on.
 ; @param r18 ontime  (in 1/10s)
 ; @param r19 offtime (in 1/10s)
+; @param r20 repeats (stop after this number of repeats, 0 for continuous mode)
 ; @clobbers none
 ;
 
@@ -117,12 +179,14 @@ LedSimple_SetTiming:
   sts ledSimpleOnTime, r18
   sts ledSimpleTimer, r18
   sts ledSimpleOffTime, r19
+  sts ledSimpleRepeat, r20
   cbi LED_SIMPLE_PORT, LED_SIMPLE_PINNUM ; on
   ret
 ; @end
 
 
 
+
 LED_SIMPLE_END:
 .equ MODULE_SIZE_LED_SIMPLE = LED_SIMPLE_END-LED_SIMPLE_BEGIN