diff --git a/avr/apps/reportsensors/main.asm b/avr/apps/reportsensors/main.asm
index 3f6dfb16..13a3657c 100644
--- a/avr/apps/reportsensors/main.asm
+++ b/avr/apps/reportsensors/main.asm
@@ -86,10 +86,19 @@ AppReportSensors_OnEverySecond_store:
   breq AppReportSensors_OnEverySecond_sendValue2
 #endif
 
-#ifdef MODULES_SGP40
+#ifdef MODULES_MULTIFAN
   cpi r16, 32
+  breq AppReportSensors_OnEverySecond_sendValueMF1
+  cpi r16, 33
+  breq AppReportSensors_OnEverySecond_sendValueMF2
+  cpi r16, 34
+  breq AppReportSensors_OnEverySecond_sendValueMF3
+#endif
+
+#ifdef MODULES_SGP40
+  cpi r16, 53
   breq AppReportSensors_OnEverySecond_measureValue4
-  cpi r16, 42
+  cpi r16, 63
   breq AppReportSensors_OnEverySecond_sendValue4
 #endif
 
@@ -145,6 +154,15 @@ AppReportSensors_OnEverySecond_sendValue3:
   rjmp Ds18b20_SendTemperature
 #endif
 
+#ifdef MODULES_MULTIFAN
+AppReportSensors_OnEverySecond_sendValueMF1:
+  bigjmp MultiFan_ReportSpeed1
+AppReportSensors_OnEverySecond_sendValueMF2:
+  bigjmp MultiFan_ReportSpeed2
+AppReportSensors_OnEverySecond_sendValueMF3:
+  bigjmp MultiFan_ReportSpeed3
+#endif
+
 #ifdef MODULES_SGP40
  AppReportSensors_OnEverySecond_measureValue4:
   rjmp SGP40_MeasureRawSignal
@@ -182,6 +200,7 @@ AppReportSensors_OnEverySecond_sendMotionValue:
   rjmp appMotionSendValue
 #endif
 
+
 ; @end
 
 
diff --git a/avr/devices/all/defs.asm b/avr/devices/all/defs.asm
index 4d0ea50e..5f739bea 100644
--- a/avr/devices/all/defs.asm
+++ b/avr/devices/all/defs.asm
@@ -23,6 +23,7 @@
 .equ AQHOME_VALUETYPE_LIGHT     = 10
 .equ AQHOME_VALUETYPE_ONOFF     = 11
 .equ AQHOME_VALUETYPE_ONOFFAUTO = 12
+.equ AQHOME_VALUETYPE_RPM       = 13
 
 
 ; Value Ids
diff --git a/avr/devices/all/modules_include.asm b/avr/devices/all/modules_include.asm
index 00730b7d..e76d576f 100644
--- a/avr/devices/all/modules_include.asm
+++ b/avr/devices/all/modules_include.asm
@@ -328,6 +328,7 @@ MODULE_END_COM2W2:
 .include "modules/multifan/main.asm"
   #ifdef MODULES_NETWORK
   .include "modules/multifan/recv.asm"
+  .include "modules/multifan/send.asm"
   .include "devices/all/handlevaluemsg.asm"
   #endif
 #endif
diff --git a/avr/modules/multifan/main.asm b/avr/modules/multifan/main.asm
index d72ed73e..5ca5f0a9 100644
--- a/avr/modules/multifan/main.asm
+++ b/avr/modules/multifan/main.asm
@@ -56,6 +56,10 @@ MultiFan_Init:
   rcall multiFanSetupTimer
   rcall multiFanSetupPins
 
+.ifdef MULTIFAN_SETUPIRQ_FN
+  bigcall MULTIFAN_SETUPIRQ_FN
+.endif
+
   sec
   ret
 ; @end
@@ -68,7 +72,6 @@ MultiFan_Init:
 ; @clobbers r16, r17, r18, r19, r24, Y
 
 MultiFan_OnEverySecond:
-ret ; DEBUG
   ldi yl, LOW(multiFanObjects)
   ldi yh, HIGH(multiFanObjects)
   ldi r24, MULTIFAN_FANS
@@ -104,7 +107,8 @@ MultiFan_OnEverySecond_loop:
       
       std Y+MULTIFAN_FAN_OFFS_CURR_FREQUENCY_LO, r16
       std Y+MULTIFAN_FAN_OFFS_CURR_FREQUENCY_HI, r17
-  
+
+      adiw yh:yl, MULTIFAN_FAN_SIZE
       dec r24
     brne MultiFan_OnEverySecond_loop
 
@@ -122,13 +126,6 @@ MultiFan_OnEverySecond_loop:
 ; @clobbers r24, r25, Y
 
 MultiFan_CheckPort:
-  inr r16, MULTIFAN_TACHO_INPUT
-  lds r18, multiFanPrevPortVal
-  sts multiFanPrevPortVal, r16
-  eor r18, r16                  ; r18: changes in bits=1
-  com r18                       ; r18: changes in bits=0
-  or r18, r16                   ; r18: 0=bit flipped to 0
-
   ldi yl, LOW(multiFanObjects)
   ldi yh, HIGH(multiFanObjects)
 
@@ -243,7 +240,7 @@ multiFanIncCounter:
   ldd r25, Y+MULTIFAN_FAN_OFFS_COUNTER_HI
   adiw r25:r24, 1
   std Y+MULTIFAN_FAN_OFFS_COUNTER_LO, r24
-  std Y+MULTIFAN_FAN_OFFS_COUNTER_HI, r24
+  std Y+MULTIFAN_FAN_OFFS_COUNTER_HI, r25
   ret
 ; @end
 
@@ -292,8 +289,15 @@ multiFanSetupPins:
 ; @clobbers r16, r17
 
 multiFanSetupTimer:
+.if clock == 1000000
   ; prescaler 1
   ldi r16, (0<<PSR1)|(0<<DTPS11)|(0<<DTPS10) | (0<<CS13)|(0<<CS12)|(0<<CS11)|(1<<CS10)
+.elif clock == 8000000
+  ; prescaler 8
+  ldi r16, (0<<PSR1)|(0<<DTPS11)|(0<<DTPS10) | (0<<CS13)|(1<<CS12)|(0<<CS11)|(0<<CS10)
+.else
+  .error "Unhandled clock"
+.endif
   outr TCCR1B, r16
   ; select fast PWM, enable PIN output (don't activate negated pin outputs)
 .if MULTIFAN_FANS == 1
@@ -351,7 +355,7 @@ multiFanPinChangeIsr:
   push r15
     in r15, SREG
     push r16
-      inr r16, MULTIFAN_TACHO_INPUT
+      in r16, MULTIFAN_TACHO_INPUT
       push r18
         lds r18, multiFanPrevPortVal
         sts multiFanPrevPortVal, r16
diff --git a/avr/modules/multifan/send.asm b/avr/modules/multifan/send.asm
new file mode 100644
index 00000000..536995d5
--- /dev/null
+++ b/avr/modules/multifan/send.asm
@@ -0,0 +1,96 @@
+; ***************************************************************************
+; copyright   : (C) 2026 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.   *
+; ***************************************************************************
+
+
+
+; ---------------------------------------------------------------------------
+; @routine MultiFan_ReportSpeed1
+;
+; @param R17     value id
+; @param R19:R18 speed (RPM)
+; @clobbers R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, X
+
+MultiFan_ReportSpeed1:
+  push yl
+    push yh
+      ldi yl, LOW(multiFanObjects)
+      ldi yh, HIGH(multiFanObjects)
+      ldi r17, VALUE_ID_FAN1_SPEED
+      ldd r18, Y+MULTIFAN_FAN_OFFS_CURR_FREQUENCY_LO
+      ldd r19, Y+MULTIFAN_FAN_OFFS_CURR_FREQUENCY_HI
+      rcall multiFanReportSpeed
+    pop yh
+  pop yl
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine MultiFan_ReportSpeed2
+;
+; @param R17     value id
+; @param R19:R18 speed (RPM)
+; @clobbers R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, X
+
+MultiFan_ReportSpeed2:
+  push yl
+    push yh
+      ldi yl, LOW(multiFanObjects+MULTIFAN_FAN_SIZE)
+      ldi yh, HIGH(multiFanObjects+MULTIFAN_FAN_SIZE)
+      ldi r17, VALUE_ID_FAN2_SPEED
+      ldd r18, Y+MULTIFAN_FAN_OFFS_CURR_FREQUENCY_LO
+      ldd r19, Y+MULTIFAN_FAN_OFFS_CURR_FREQUENCY_HI
+      rcall multiFanReportSpeed
+    pop yh
+  pop yl
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine MultiFan_ReportSpeed2
+;
+; @param R17     value id
+; @param R19:R18 speed (RPM)
+; @clobbers R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, X
+
+MultiFan_ReportSpeed3:
+  push yl
+    push yh
+      ldi yl, LOW(multiFanObjects+(MULTIFAN_FAN_SIZE*2))
+      ldi yh, HIGH(multiFanObjects+(MULTIFAN_FAN_SIZE*2))
+      ldi r17, VALUE_ID_FAN3_SPEED
+      ldd r18, Y+MULTIFAN_FAN_OFFS_CURR_FREQUENCY_LO
+      ldd r19, Y+MULTIFAN_FAN_OFFS_CURR_FREQUENCY_HI
+      rcall multiFanReportSpeed
+    pop yh
+  pop yl
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine multiFanReportSpeed
+;
+; @param R17     value id
+; @param R19:R18 speed (RPM)
+; @clobbers R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, X, Y
+
+multiFanReportSpeed:
+  ldi r20, 1
+  clr r21
+  ldi r22, AQHOME_VALUETYPE_RPM
+  rcall Main_SendValueReport       ; (R16, R17, R18, R19, R20, R21, R23, R24, R25, X)
+  ret
+; @end
+
+