diff --git a/avr/att84_temp1.asm b/avr/att84_temp1.asm
index d16633f..62500fc 100644
--- a/avr/att84_temp1.asm
+++ b/avr/att84_temp1.asm
@@ -21,12 +21,12 @@
 ;                                 AtTiny84
 ;                                 --------
 ;                            VCC  1     14  GND
-;                            PB0  2     13  PA0
+;                            PB0  2     13  PA0  REED_OUT
 ;                            PB1  3     12  PA1  COM-DATA
-;                  /RESET    PB3  4     11  PA2  [OWI]
+;                  /RESET    PB3  4     11  PA2  REED_IN1
 ;                  [KEY1]    PB2  5     10  PA3  LED
 ;                  COM_ATTN  PA7  6      9  PA4  TWI-SCL
-;                  TWI-SDA   PA6  7      8  PA5
+;                  TWI-SDA   PA6  7      8  PA5  REED_IN2
 ;                                 --------
 ;
 ; ***************************************************************************
@@ -67,6 +67,7 @@
 ;#define MODULES_LCD
 #define MODULES_SI7021
 #define MODULES_STATS
+;#define MODULES_CNY70
 
 
 .set MODULES_MASK = 0
@@ -91,6 +92,10 @@
 #ifdef MODULES_STATS
 .set MODULES_MASK = MODULES_MASK | (1<<AQHOME_FW_MODULE_STATS)
 #endif
+#ifdef MODULES_CNY70
+.set MODULES_MASK = MODULES_MASK | (1<<AQHOME_FW_MODULE_CNY70)
+#endif
+
 
 
 ; ---------------------------------------------------------------------------
@@ -102,6 +107,7 @@
 .equ VALUE_ID_TEMP1 = 0x01
 .equ VALUE_ID_HUM1  = 0x02
 
+.equ VALUE_ID_ADC   = 0x03
 
 
 ; ---------------------------------------------------------------------------
@@ -162,6 +168,21 @@
 
 
 
+; ---------------------------------------------------------------------------
+; ADC/CNY70
+
+
+.equ CNY70_PORT_LED       = PORTB1
+.equ CNY70_DDR_LED        = DDRB
+.equ CNY70_PINNUM_LED     = PORTB1
+
+.equ CNY70_PORT_ADC       = PORTA5 ; adc5
+.equ CNY70_DDR_ADC        = DDRB
+.equ CNY70_PINNUM_ADC     = PORTA5
+.equ CNY70_MUX_ADC        = MUX5
+.equ CNY70_ADCSRB_ADC     = ADC5D
+
+
 
 
 ; ***************************************************************************
@@ -189,7 +210,11 @@
 	reti ; OC0B
 	reti ; OVF0
 	reti ; ACI
-	reti ; ADCC
+#ifdef MODULES_CNY70
+	rjmp cny70Isr ; ADCC
+#else
+        reti ; ADCC
+#endif
 	reti ; ERDY
 	reti ; USI_STR
 	reti ; USI_OVF
@@ -242,6 +267,9 @@ firmwareStart:   rjmp main
 #ifdef MODULES_STATS
   .include "modules/stats/main.asm"
 #endif
+#ifdef MODULES_CNY70
+  .include "modules/cny70/main.asm"
+#endif
 
 
 
@@ -260,6 +288,9 @@ sramTimerEnqueueValues:      .byte 2
   sramTimerSI7021SendTemp:     .byte 2
   sramTimerSI7021SendHumidity: .byte 2
 #endif
+#ifdef MODULES_CNY70
+  sramTimerCny70SendAdc:       .byte 2
+#endif
 #ifdef MODULES_LCD
   sramPeriodicalLcdMark:     .byte 2
 #endif
@@ -297,6 +328,9 @@ timerList:
   .dw sramTimerSI7021Measure,      SI7021_PeriodicMeasurement, 0,                   30    ; every 30s
   .dw sramTimerSI7021SendTemp,     sendTemp,                   TIMER_FLAGS_IF_ADDR, 60    ; every 60s
   .dw sramTimerSI7021SendHumidity, sendHumidity,               TIMER_FLAGS_IF_ADDR, 60    ; every 60s
+#endif
+#ifdef MODULES_CNY70
+  .dw sramTimerCny70SendAdc,       sendAdc,                    TIMER_FLAGS_IF_ADDR, 30    ; every 30s
 #endif
   .dw 0 ; end of list
 
@@ -354,6 +388,20 @@ sendTemp_okay:
 
 
 
+#ifdef MODULES_CNY70
+sendAdc:
+  rcall CNY70_SendAdc
+  brcs sendAdc_okay
+  ; set timer to 1s to retry later
+  ldi xl, LOW(sramTimerCny70SendAdc)
+  ldi xh, HIGH(sramTimerCny70SendAdc)
+  rjmp Timer_SetValueTo1s
+sendAdc_okay:
+  ret
+#endif
+
+
+
 ; ---------------------------------------------------------------------------
 ; Called every 100ms. Add your routine calls here. No arguments, no results.
 
@@ -366,6 +414,11 @@ onEvery100ms:
   ldi yh, HIGH(ledA3Sram)
   rcall Led_Tick
 #endif
+
+#ifdef MODULES_CNY70
+  rcall CNY70_Every100ms
+#endif
+
   ret
 
 
diff --git a/avr/defs.asm b/avr/defs.asm
index b0fc0d3..0dd428f 100644
--- a/avr/defs.asm
+++ b/avr/defs.asm
@@ -9,6 +9,7 @@
 
 
 
+.equ AQHOME_VALUETYPE_UNKNOWN  = 0
 .equ AQHOME_VALUETYPE_TEMP     = 1
 .equ AQHOME_VALUETYPE_HUMIDITY = 2
 
@@ -21,6 +22,7 @@
 .equ AQHOME_FW_MODULE_LCD       = 5
 .equ AQHOME_FW_MODULE_SI7021    = 6
 .equ AQHOME_FW_MODULE_STATS     = 7
+.equ AQHOME_FW_MODULE_CNY70     = 8
 
 
 .equ AQHOME_FW_TYPE_ATT84_BASE  = 0
diff --git a/avr/main.asm b/avr/main.asm
index 506c6d8..fbc6537 100644
--- a/avr/main.asm
+++ b/avr/main.asm
@@ -136,6 +136,10 @@ initModules:
   rcall Stats_Init
 #endif
 
+#ifdef MODULES_CNY70
+  rcall CNY70_Init
+#endif
+
   ; done
   ret
 
diff --git a/avr/modules/0BUILD b/avr/modules/0BUILD
index 39f266f..b7e691d 100644
--- a/avr/modules/0BUILD
+++ b/avr/modules/0BUILD
@@ -4,6 +4,7 @@
 
   <subdirs>
     bmp280
+    cny70
     com2
     comproto
     flash
diff --git a/avr/modules/cny70/0BUILD b/avr/modules/cny70/0BUILD
new file mode 100644
index 0000000..febd367
--- /dev/null
+++ b/avr/modules/cny70/0BUILD
@@ -0,0 +1,11 @@
+<?xml?>
+
+<gwbuild>
+
+  <extradist>
+    main.asm
+  </extradist>
+
+</gwbuild>
+
+
diff --git a/avr/modules/cny70/main.asm b/avr/modules/cny70/main.asm
new file mode 100644
index 0000000..8217f81
--- /dev/null
+++ b/avr/modules/cny70/main.asm
@@ -0,0 +1,182 @@
+; ***************************************************************************
+; copyright   : (C) 2023 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.   *
+; ***************************************************************************
+
+
+; doesn't work, yet
+
+
+
+; ***************************************************************************
+; data
+
+.dseg
+
+
+.equ CNY70_FLAGS_ADC_STARTED  = 0x01
+.equ CNY70_FLAGS_ADC_FINISHED = 0x02
+.equ CNY70_FLAGS_ADC_VALID    = 0x04
+
+.equ CNY70_TIMER_100MS        = 20 ; every 2s
+
+
+cny70DataBegin:
+  cny70Flags:        .byte 1
+  cny70LastData:     .byte 1
+  cny70TimerCounter: .byte 1
+cny70DataEnd:
+
+
+
+
+; ***************************************************************************
+; code
+
+.cseg
+
+
+
+; ---------------------------------------------------------------------------
+; Init module.
+;
+; IN:
+; - nothing
+; OUT:
+; - CFLAG: set if okay, clear on error
+; USED:
+
+CNY70_Init:
+  ; preset SRAM data area
+  ldi xh, HIGH(cny70DataBegin)
+  ldi xl, LOW(cny70DataBegin)
+  clr r16
+  ldi r17, (cny70DataEnd-cny70DataBegin)
+  rcall Utils_FillSram
+
+  ; setup pins and interrupts
+  sbi CNY70_DDR_LED, CNY70_PINNUM_LED         ; set DATA port as output
+  cbi CNY70_PORT_LED, CNY70_PINNUM_LED        ; LED off
+  cbi CNY70_PORT_ADC, CNY70_PINNUM_ADC        ; disable internal pullup for ADC
+  cbi CNY70_DDR_ADC, CNY70_PINNUM_ADC         ; set ADC port as input
+
+  ldi r16, (1<<ADLAR) | (1<<CNY70_ADCSRB_ADC) ; "8 bit" mode, disable digital pin input buffer 
+  out ADCSRB, r16
+
+  sec
+  ret
+
+
+
+CNY70_Fini:
+  sec
+  ret
+
+
+
+CNY70_Run:
+  ret
+
+
+
+CNY70_Every100ms:
+  push r15
+    in r15, SREG
+    cli
+    lds r16, cny70Flags
+    andi r16, CNY70_FLAGS_ADC_STARTED
+    brne CNY70_Every100ms_done
+    
+    lds r16, cny70TimerCounter
+    inc r16
+    cpi r16, CNY70_TIMER_100MS
+    brcc CNY70_Every100ms_startConversion
+    sts cny70TimerCounter, r16
+    rjmp CNY70_Every100ms_done
+
+CNY70_Every100ms_startConversion:
+    clr r16
+    sts cny70TimerCounter, r16
+    rcall cny70StartConversion
+CNY70_Every100ms_done:
+    out SREG, r15
+  pop r15
+  ret
+
+
+
+cny70StartConversion:
+  sbi CNY70_PORT_LED, CNY70_PINNUM_LED ; LED on
+  nop
+  nop
+  nop
+  ; setup adc
+  ldi r16, CNY70_MUX_ADC
+  out ADMUX, r16
+  ; enable adc, enable irq, clear irq, select prescaler 8 (125kHz)
+  ldi r16, (1<<ADEN) | (1<<ADIE) | (1<<ADIF) | (1<<ADPS1) | (1<<ADPS0)
+  out ADCSRA, r16
+
+  sbic ADCSRA, ADSC ; start conversion
+
+  push r15
+    in r15, SREG
+    cli
+    lds r16, cny70Flags
+    ori r16, CNY70_FLAGS_ADC_STARTED
+    andi r16, ~CNY70_FLAGS_ADC_FINISHED
+    sts cny70Flags, r16
+    out SREG, r15
+  pop r15
+  ret
+
+
+
+cny70Isr:
+  push r15
+    in r15, SREG
+    push r16
+      cbi CNY70_PORT_LED, CNY70_PINNUM_LED ; LED off
+      in r16, ADCH
+      sts cny70LastData, r16    ; store value
+      clr r16                   ; disable ADC
+      out ADCSRA, r16
+      lds r16, cny70Flags
+      ori r16, CNY70_FLAGS_ADC_FINISHED | CNY70_FLAGS_ADC_VALID
+      andi r16, ~CNY70_FLAGS_ADC_STARTED
+      sts cny70Flags, r16
+    pop r16
+    out SREG, r15
+  pop r15
+  reti
+
+
+
+
+
+CNY70_SendAdc:
+  lds r16, cny70Flags
+  andi r16, CNY70_FLAGS_ADC_VALID
+  brne CNY70_SendAdc_haveValue
+  sec
+  ret
+CNY70_SendAdc_haveValue:
+  ldi r16, 0xff                      ; destination address
+  ldi r17, VALUE_ID_ADC              ; value id
+  ldi r22, AQHOME_VALUETYPE_UNKNOWN
+  lds r18, cny70LastData             ; value
+  clr r19
+  ldi r20, 1                         ; denominator
+  clr r21
+  ldi xl, LOW(com2SendBuffer)
+  ldi xh, HIGH(com2SendBuffer)
+  rcall CPRO_WriteValue
+  rjmp COM2_SendPacket
+
+
+
+