diff --git a/avr/modules/uart_hw/comonuart0.asm b/avr/modules/uart_hw/comonuart0.asm
index d77c796..60ebe7b 100644
--- a/avr/modules/uart_hw/comonuart0.asm
+++ b/avr/modules/uart_hw/comonuart0.asm
@@ -57,18 +57,7 @@ ComOnUart0_Init:
 ComOnUart0_Periodically:
   ldi yl, LOW(comOnUart0_iface)
   ldi yh, HIGH(comOnUart0_iface)
-  
-  ldd r16, Y+NET_IFACE_OFFS_READTIMER
-  inc r16
-  breq ComOnUart0_Periodically_l1
-  std Y+NET_IFACE_OFFS_READTIMER, r16
-ComOnUart0_Periodically_l1:
-  ldd r16, Y+NET_IFACE_OFFS_WRITETIMER
-  inc r16
-  breq ComOnUart0_Periodically_l2
-  std Y+NET_IFACE_OFFS_WRITETIMER, r16
-ComOnUart0_Periodically_l2:
-  ret
+  rjmp NET_Interface_Periodically
 ; @end
 
 
diff --git a/avr/modules/valsched/0BUILD b/avr/modules/valsched/0BUILD
new file mode 100644
index 0000000..febd367
--- /dev/null
+++ b/avr/modules/valsched/0BUILD
@@ -0,0 +1,11 @@
+<?xml?>
+
+<gwbuild>
+
+  <extradist>
+    main.asm
+  </extradist>
+
+</gwbuild>
+
+
diff --git a/avr/modules/valsched/main.asm b/avr/modules/valsched/main.asm
new file mode 100644
index 0000000..175ad4a
--- /dev/null
+++ b/avr/modules/valsched/main.asm
@@ -0,0 +1,204 @@
+; ***************************************************************************
+; copyright   : (C) 2025 by Martin Preuss
+; email       : martin@libchipcard.de
+;
+; ***************************************************************************
+; * This file is part of the project "AqHome".                              *
+; * Please see toplevel file COPYING of that project for license details.   *
+; ***************************************************************************
+
+
+; ***************************************************************************
+; defines
+
+.equ VALSCHED_OFFS_TIMER       = 0
+.equ VALSCHED_OFFS_FLAGS       = 1
+.equ VALSCHED_DATA_SIZE        = 2
+
+.equ VALSCHED_FLAGS_VALUE_BIT   = 0
+.equ VALSCHED_FLAGS_TOSEND_BIT  = 1
+.equ VALSCHED_FLAGS_REPEAT_BIT  = 2
+.equ VALSCHED_FLAGS_REPEAT0_BIT = 6
+.equ VALSCHED_FLAGS_REPEAT1_BIT = 7
+
+.equ VALSCHED_REPORTTIME1      = 1   ; report after 100ms
+.equ VALSCHED_REPORTTIME2      = 11  ; report after 1100ms
+.equ VALSCHED_REPORTTIME3      = 22  ; report after 2200ms
+
+.equ VALSCHED_INTERVAL         = 200 ; 20s interval
+
+
+
+; ***************************************************************************
+; code
+
+.cseg
+
+
+
+; ---------------------------------------------------------------------------
+; @routine ValueScheduler_Init @global
+;
+; @param Y  pointer to instance data
+
+ValueScheduler_Init:
+  clr r16
+  std Y+VALSCHED_OFFS_FLAGS, r16
+  dec r16
+  std Y+VALSCHED_OFFS_TIMER, r16   ; init timer in hold state
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine ValueScheduler_Fini @global
+;
+; @param Y  pointer to instance data
+
+ValueScheduler_Fini:
+  ldi r16, 0xff
+  std Y+VALSCHED_OFFS_TIMER, r16
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine ValueScheduler_Every100ms @global
+;
+; @param Y  pointer to instance data
+; @clobbers r16, r17
+
+ValueScheduler_Every100ms:
+  ldd r16, Y+VALSCHED_OFFS_TIMER
+  inc r16
+  breq ValueScheduler_Every100ms_end          ; timer on hold
+  std Y+VALSCHED_OFFS_TIMER, r16
+  cpi r16, VALSCHED_REPORTTIME1
+  breq ValueScheduler_Every100ms_setSendFlag
+  cpi r16, VALSCHED_REPORTTIME2
+  breq ValueScheduler_Every100ms_setSendFlag
+  cpi r16, VALSCHED_REPORTTIME3
+  breq ValueScheduler_Every100ms_setSendFlag
+  cpi r16, VALSCHED_INTERVAL
+  brne ValueScheduler_Every100ms_end
+  ; interval finished, check for repeat
+  ldd r17, Y+VALSCHED_OFFS_FLAGS
+  clr r16
+  sbrs r16, VALSCHED_FLAGS_REPEAT_BIT
+    dec r17                           ; bit not set, stop counter after this interval
+  std Y+VALSCHED_OFFS_TIMER, r17
+  rjmp ValueScheduler_Every100ms_end
+ValueScheduler_Every100ms_setSendFlag:
+  ldd r16, Y+VALSCHED_OFFS_FLAGS
+  ori r16, (1<<VALSCHED_FLAGS_TOSEND_BIT)
+  std Y+VALSCHED_OFFS_FLAGS, r16
+ValueScheduler_Every100ms_end:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine ValueScheduler_CheckSend @global
+;
+; Check whether the value should be sent.
+;
+; @param Y  pointer to instance data
+; @return CFLAG set if value should be sent, cleared otherwise
+; @clobbers r16
+
+ValueScheduler_CheckSend:
+  ldd r16, Y+VALSCHED_OFFS_FLAGS
+  andi r16, (1<<VALSCHED_FLAGS_TOSEND_BIT)
+  breq ValueScheduler_CheckSend_end
+  sec
+ValueScheduler_CheckSend_end:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine ValueScheduler_MarkSent @global
+;
+; Tells this module that a value message has been sent.
+;
+; @param Y  pointer to instance data
+; @clobbers r16
+
+ValueScheduler_MarkSent:
+  ldd r16, Y+VALSCHED_OFFS_FLAGS
+  andi r16, ~(1<<VALSCHED_FLAGS_TOSEND_BIT)
+  std Y+VALSCHED_OFFS_FLAGS, r16
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine ValueScheduler_SetValue @global
+;
+; Reduces value to 1 bit.
+;
+; @param Y  pointer to instance data
+; @param r16 value
+; @clobbers r17
+
+ValueScheduler_SetValue:
+  mov r17, r16
+  rcall ValueScheduler_GetValue
+  cp r17, r16
+  breq ValueScheduler_SetValue_end
+  ; value changed
+  mov r16, r17
+  tst r16
+  breq ValueScheduler_SetValue_set0
+  ; set 1
+  ldd r17, Y+VALSCHED_OFFS_FLAGS
+  ori r17, (1<<VALSCHED_FLAGS_REPEAT_BIT)     ; set repeat bit
+  sbrs r17, VALSCHED_FLAGS_REPEAT1_BIT
+    andi r17, ~(1<<VALSCHED_FLAGS_REPEAT_BIT) ; clear repeat bit if not wanted for "1"
+  ori r17, (1<<VALSCHED_FLAGS_VALUE_BIT)      ; 1: set value bit and repeat bit
+  std Y+VALSCHED_OFFS_FLAGS, r17              ; store new byte
+  rjmp ValueScheduler_SetValue_resetTimer
+ValueScheduler_SetValue_set0:
+  ldd r17, Y+VALSCHED_OFFS_FLAGS
+  ori r17, (1<<VALSCHED_FLAGS_REPEAT_BIT)
+  sbrs r17, VALSCHED_FLAGS_REPEAT0_BIT
+    andi r17, ~(1<<VALSCHED_FLAGS_REPEAT_BIT) ; clear repeat bit if not wanted for "0"
+  andi r17, ~(1<<VALSCHED_FLAGS_VALUE_BIT)    ; 0: clear value bit and repeat bit
+  std Y+VALSCHED_OFFS_FLAGS, r17              ; store new byte
+ValueScheduler_SetValue_resetTimer:
+  clr r17                                     ; reset timer
+  std Y+VALSCHED_OFFS_TIMER, r17
+ValueScheduler_SetValue_end:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine ValueScheduler_GetValue @global
+;
+; Return current value (reduced to 1 bit).
+;
+; @param Y  pointer to instance data
+; @return R16 value (reduced to 1 bit!)
+; @clobbers none
+
+ValueScheduler_GetValue:
+  ldd r16, Y+VALSCHED_OFFS_FLAGS
+  lsr r16, VALSCHED_FLAGS_VALUE_BIT
+  andi r16, 1
+  ret
+; @end
+
+
+
+
+
+
+
+