diff --git a/avr/devices/n06/.gitignore b/avr/devices/n06/.gitignore
new file mode 100644
index 0000000..8e0618c
--- /dev/null
+++ b/avr/devices/n06/.gitignore
@@ -0,0 +1,2 @@
+*.eep.hex
+*.obj
diff --git a/avr/devices/n06/0BUILD b/avr/devices/n06/0BUILD
new file mode 100644
index 0000000..ae878c4
--- /dev/null
+++ b/avr/devices/n06/0BUILD
@@ -0,0 +1,52 @@
+<?xml?>
+
+<gwbuild>
+
+  <target type="AvrHexFile" name="n06_main" >
+
+    <includes type="avrasm" >
+      -I $(builddir)
+      -I $(srcdir)
+      -I $(topsrcdir)/avr
+      -I $(topbuilddir)/avr
+    </includes>
+
+
+    <sources type="avrasm" >
+      n06_main.asm
+    </sources>
+
+
+  </target>
+
+
+
+  <target type="AvrHexFile" name="n06_boot" >
+
+    <includes type="avrasm" >
+      -I $(builddir)
+      -I $(srcdir)
+      -I $(topsrcdir)/avr
+      -I $(topbuilddir)/avr
+    </includes>
+
+
+    <sources type="avrasm" >
+      n06_boot.asm
+    </sources>
+
+
+  </target>
+
+
+  <subdirs>
+  </subdirs>
+
+  <extradist>
+    n06_defs.asm
+  </extradist>
+  
+
+</gwbuild>
+
+
diff --git a/avr/devices/n06/n06_boot.asm b/avr/devices/n06/n06_boot.asm
new file mode 100644
index 0000000..c29a7b0
--- /dev/null
+++ b/avr/devices/n06/n06_boot.asm
@@ -0,0 +1,127 @@
+; ***************************************************************************
+; Source file for base system node on AtTiny 84
+;
+; This is for the maintenance system (i.e. the flash loader).
+;
+; All definitions and changes should go into this file.
+; ***************************************************************************
+
+.equ clock=1000000 ; Define the clock frequency
+
+.nolist
+.include "include/tn84def.inc" ; Define device ATtiny84
+.list
+
+.include "n06_defs.asm"
+.include "defs.asm"
+
+
+
+; ***************************************************************************
+; defines
+
+; ---------------------------------------------------------------------------
+; generic
+
+.include "common/utils_wait.asm"
+.include "modules/com2/defs.asm"
+.include "modules/comproto/defs.asm"
+
+
+
+; ---------------------------------------------------------------------------
+; firmware settings
+
+.equ FIRMWARE_VERSION_MAJOR       = 0
+.equ FIRMWARE_VERSION_MINOR       = 0
+.equ FIRMWARE_VERSION_PATCHLEVEL  = 1
+
+
+
+; ---------------------------------------------------------------------------
+; LED
+
+.equ LED_DDR             = DDRA
+.equ LED_PORT            = PORTA
+.equ LED_PIN             = PINA
+.equ LED_PINNUM          = PORTA3
+
+
+; ***************************************************************************
+; code segment
+
+.cseg
+.org 0x0000
+
+
+
+; ---------------------------------------------------------------------------
+; Reset and interrupt vectors
+;  rjmp start ; Reset vector
+  rjmp main ; Reset vector
+  reti ; EXT_INT0
+  reti ; PCI0
+  reti ; PCI1
+  reti ; WATCHDOG
+  reti ; ICP1
+  reti ; OC1A
+  reti ; OC1B
+  reti ; OVF1
+  reti ; OC0A
+  reti ; OC0B
+  reti ; OVF0
+  reti ; ACI
+  reti ; ADCC
+  reti ; ERDY
+  reti ; USI_STR
+  reti ; USI_OVF
+
+
+devInfoBlock:        ; 12 bytes
+devInfoManufacturer: .db 'A', 'Q', 'U', 'A'
+devInfoId:           .db 'N', 0
+devInfoVersion:      .db 6, 4                 ; version, revision
+firmwareVersion:     .db FIRMWARE_VARIANT_BOOT, FIRMWARE_VERSION_MAJOR
+                     .db FIRMWARE_VERSION_MINOR, FIRMWARE_VERSION_PATCHLEVEL
+
+firmwareStart:   rjmp main ; will be overwritten when flashing
+
+
+
+; ***************************************************************************
+; main code
+
+
+.org BOOTLOADER_ADDR
+
+
+main:
+  rjmp bootLoader ; this routine is in modules/flash/proto.asm
+
+
+
+
+; ***************************************************************************
+; includes
+
+.include "modules/com2/lowlevel.asm"
+.include "modules/com2/crc.asm"
+.include "modules/com2/packets.asm"
+.include "common/crc8.asm"
+.include "common/utils_wait_fixed.asm"
+.include "common/utils_copy_from_flash.asm"
+.include "common/utils_copy_sdram.asm"
+.include "modules/flash/bootloader.asm"
+.include "modules/flash/flash.asm"
+.include "modules/flash/recv.asm"
+.include "modules/flash/send.asm"
+.include "modules/flash/wait.asm"
+.include "modules/flash/hdl_flash_start.asm"
+.include "modules/flash/hdl_flash_data.asm"
+.include "modules/flash/hdl_flash_end.asm"
+.include "modules/flash/flash_rsp.asm"
+.include "modules/flash/flash_ready.asm"
+
+
+
+
diff --git a/avr/devices/n06/n06_defs.asm b/avr/devices/n06/n06_defs.asm
new file mode 100644
index 0000000..153ebf5
--- /dev/null
+++ b/avr/devices/n06/n06_defs.asm
@@ -0,0 +1,123 @@
+; ***************************************************************************
+; 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.   *
+; ***************************************************************************
+
+
+; ***************************************************************************
+;
+;                                 AtTiny84
+;                                 --------
+;                            VCC  1     14  GND
+;                            PB0  2     13  PA0
+;                  CNY70-K   PB1  3     12  PA1  COM-DATA
+;                  /RESET    PB3  4     11  PA2
+;                  AUX       PB2  5     10  PA3  LED
+;                  COM_ATTN  PA7  6      9  PA4  TWI-SCL
+;                  TWI-SDA   PA6  7      8  PA5  CNY70-C
+;                                 --------
+;
+; ***************************************************************************
+
+
+
+.equ BOOTLOADER_ADDR = 0xd00
+
+.equ FIRMWARE_VARIANT_BOOT        = 0
+.equ FIRMWARE_VARIANT_TEMP_WINDOW = 1
+
+
+
+
+; ---------------------------------------------------------------------------
+; LED module
+
+.equ LED_SIMPLE_ONTIME  = 2
+.equ LED_SIMPLE_OFFTIME = 30
+.equ LED_SIMPLE_DDR     = DDRA
+.equ LED_SIMPLE_PORT    = PORTA
+.equ LED_SIMPLE_PINNUM  = PORTA3
+
+
+
+; ---------------------------------------------------------------------------
+; COM module
+
+.equ COM_BIT_LENGTH      = 52000 ; 104000=9600, 52000=19200, 26000=38400
+
+.equ COM_DDR_DATA        = DDRA
+.equ COM_PORT_DATA       = PORTA
+.equ COM_PIN_DATA        = PINA
+.equ COM_PINNUM_DATA     = PORTA1
+
+.equ COM_DDR_ATTN        = DDRA
+.equ COM_PORT_ATTN       = PORTA
+.equ COM_PIN_ATTN        = PINA
+.equ COM_PINNUM_ATTN     = PORTA7
+
+.equ COM_IRQ_ADDR_ATTN   = PCMSK0
+.equ COM_IRQ_BIT_ATTN    = 7              ; bit 7 in PCMSK0
+.equ COM_IRQ_GIFR_ATTN   = PCIF0
+.equ COM_IRQ_GIMSK_ATTN  = PCIE0
+
+
+
+; ---------------------------------------------------------------------------
+; TWI master module
+
+;.equ TWI_BIT_LENGTH = 10000 ; 100000 and 200000 works for display: 10000, 100000, 200000
+.equ TWI_BIT_LENGTH = 1 ; 10, 100, 500, 100000 and 200000 works for display: 10000, 100000, 200000
+
+.equ TWI_DDR_SCL          = DDRA
+.equ TWI_PORT_SCL         = PORTA
+.equ TWI_PIN_SCL          = PINA
+.equ TWI_PINNUM_SCL       = PORTA4
+
+.equ TWI_DDR_SDA          = DDRA
+.equ TWI_PORT_SDA         = PORTA
+.equ TWI_PIN_SDA          = PINA
+.equ TWI_PINNUM_SDA       = PORTA6
+
+
+
+; ---------------------------------------------------------------------------
+; LCD module
+
+.equ LCD_TWI_ADDRESS      = 0x3c
+
+
+
+; ---------------------------------------------------------------------------
+; BMP 280
+
+.equ BMP280_ADDR          = 0x76
+
+
+
+; ---------------------------------------------------------------------------
+; SI 7021
+
+.equ SI7021_ADDR          = 0x40
+
+
+
+; ---------------------------------------------------------------------------
+; ADC/CNY70
+
+
+.equ CNY70_PORT_LED       = PORTB
+.equ CNY70_DDR_LED        = DDRB
+.equ CNY70_PINNUM_LED     = PORTB1
+
+.equ CNY70_PORT_ADC       = PORTA ; adc5
+.equ CNY70_DDR_ADC        = DDRA
+.equ CNY70_PINNUM_ADC     = PORTA5
+.equ CNY70_MUX_ADC        = MUX5
+
+
+
+
diff --git a/avr/devices/n06/n06_main.asm b/avr/devices/n06/n06_main.asm
new file mode 100644
index 0000000..0a2fa81
--- /dev/null
+++ b/avr/devices/n06/n06_main.asm
@@ -0,0 +1,336 @@
+; ***************************************************************************
+; copyright   : (C) 2024 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.   *
+; ***************************************************************************
+
+
+
+
+; ***************************************************************************
+; Source file for temperature sensor node on AtTiny 84
+;
+; This is for the full system (i.e. not the boot loader).
+;
+; All definitions and changes should go into this file.
+;
+;
+; ***************************************************************************
+
+
+.equ clock=1000000 ; Define the clock frequency
+
+
+
+.nolist
+.include "include/tn84def.inc" ; Define device ATtiny84
+.list
+
+.include "n06_defs.asm"
+.include "defs.asm"
+
+
+
+; ***************************************************************************
+; defines
+
+; ---------------------------------------------------------------------------
+; generic
+
+
+.include "common/utils_wait.asm"
+
+
+; ---------------------------------------------------------------------------
+; firmware settings including list of modules used
+
+.equ FIRMWARE_VERSION_MAJOR       = 0
+.equ FIRMWARE_VERSION_MINOR       = 0
+.equ FIRMWARE_VERSION_PATCHLEVEL  = 1
+
+
+#define MODULES_TIMER
+#define MODULES_COM
+#define MODULES_COM_WITH_ADDR_PROTO
+;#define MODULES_LED
+#define MODULES_LED_SIMPLE
+#define MODULES_TWI_MASTER
+;#define MODULES_LCD
+#define LCD_MINIMAL_FONT
+#define MODULES_SI7021
+#define MODULES_STATS
+;#define MODULES_CNY70
+;#define MODULES_REED
+
+
+
+; ---------------------------------------------------------------------------
+; defines for values
+
+.equ VALUE_ID_TEMP1 = 0x01
+.equ VALUE_ID_HUM1  = 0x02
+
+.equ VALUE_ID_ADC   = 0x03
+.equ VALUE_ID_REED1 = 0x04
+.equ VALUE_ID_REED2 = 0x05
+
+
+
+; ***************************************************************************
+; code segment
+
+.cseg
+.org 000000
+
+
+
+; ---------------------------------------------------------------------------
+; Reset and interrupt vectors (will be removed as soon as we can flash data over COM)
+
+;	rjmp main ; Reset vector
+        rjmp BOOTLOADER_ADDR ; Reset vector  ; use this for flashed system
+	reti ; EXT_INT0
+	rjmp com2IsrPcint0 ; PCI0
+	reti ; PCI1
+	reti ; WATCHDOG
+	reti ; ICP1
+	reti ; OC1A
+	reti ; OC1B
+	reti ; OVF1
+        rjmp timerIrqOC0A ; OC0A
+	reti ; OC0B
+	reti ; OVF0
+	reti ; ACI
+        reti ; ADCC
+	reti ; ERDY
+	reti ; USI_STR
+	reti ; USI_OVF
+
+
+devInfoBlock:        ; 12 bytes
+devInfoManufacturer: .db 'A', 'Q', 'U', 'A'
+devInfoId:           .db 'N', 0
+devInfoVersion:      .db 6, 4                 ; version, revision
+firmwareVersion:     .db FIRMWARE_VARIANT_BOOT, FIRMWARE_VERSION_MAJOR
+                     .db FIRMWARE_VERSION_MINOR, FIRMWARE_VERSION_PATCHLEVEL
+
+firmwareStart:   rjmp main
+
+
+; ***************************************************************************
+; includes
+
+.include "common/utils.asm"
+.include "common/utils_wait_fixed.asm"
+.include "common/utils_copy_from_flash.asm"
+.include "common/utils_copy_sdram.asm"
+.include "common/crc8.asm"
+
+#ifdef MODULES_TIMER
+  .include "modules/timer/main.asm"
+#endif
+#ifdef MODULES_LED
+.include "modules/led/main.asm"
+#endif
+#ifdef MODULES_LED_SIMPLE
+.include "modules/led_simple/main.asm"
+#endif
+#ifdef MODULES_COM
+  .include "modules/com2/defs.asm"
+  .include "modules/com2/main.asm"
+  #ifdef MODULES_COM_WITH_ADDR_PROTO
+    .include "modules/comproto/defs.asm"
+    .include "modules/comproto/main.asm"
+    .include "modules/comproto/addr.asm"
+    .include "modules/comproto/msg_recvstats.asm"
+    .include "modules/comproto/msg_sendstats.asm"
+    .include "modules/comproto/msg_sysstats.asm"
+    .include "modules/comproto/msg_memstats.asm"
+    .include "modules/comproto/msg_pong.asm"
+    .include "modules/comproto/msg_value.asm"
+    .include "modules/comproto/msg_device.asm"
+    .include "modules/comproto/msg_reboot.asm"
+  #endif
+#endif
+#ifdef MODULES_TWI_MASTER
+  .include "modules/twimaster/main.asm"
+#endif
+#ifdef MODULES_LCD
+  .include "modules/lcd/main.asm"
+#endif
+#ifdef MODULES_SI7021
+  .include "modules/si7021/main.asm"
+#endif
+#ifdef MODULES_STATS
+  .include "modules/stats/main.asm"
+#endif
+#ifdef MODULES_CNY70
+  .include "modules/cny70/main.asm"
+#endif
+#ifdef MODULES_REED
+  .include "modules/reed/main.asm"
+#endif
+
+
+
+; ***************************************************************************
+; data in SRAM
+
+.dseg
+
+
+#ifdef MODULES_LCD
+  sramTimerWriteStats:       .byte 2
+#endif
+sramTimerEnqueueValues:      .byte 2
+#ifdef MODULES_SI7021
+  sramTimerSI7021Measure:      .byte 2
+  sramTimerSI7021SendTemp:     .byte 2
+  sramTimerSI7021SendHumidity: .byte 2
+#endif
+#ifdef MODULES_CNY70
+  sramTimerCny70SendAdc:       .byte 2
+#endif
+#ifdef MODULES_LCD
+  sramPeriodicalLcdMark:       .byte 2
+#endif
+
+
+; ***************************************************************************
+; data in FLASH
+
+.cseg
+
+ledA3Flash:    .db DDRA+0x20, PORTA+0x20, PINA+0x20, (1<<PORTA3)
+blinkPattern:  .db 2, 50, 0xff, 0xff   ; 1 short blink, 5s pause, restart
+;blinkPattern2: .db 2, 2, 0xff, 0xff   ; 1 short blink, short pause, restart
+
+
+
+
+; ---------------------------------------------------------------------------
+; timer list
+
+
+timerList:
+;     SRAM variable/counter        routine                     flags                secs (0=don't start or restart)
+#ifdef MODULES_COM_WITH_ADDR_PROTO
+  .dw cproAddresModeTimer,         CPRO_Address_OnTimer,       0,                   0     ; (no restart)
+#endif
+#ifdef MODULES_STATS
+  .dw statsSendTimer,              Stats_Timer,                TIMER_FLAGS_IF_ADDR, 3000   ; every 5m
+#endif
+#ifdef MODULES_LCD
+;  .dw sramPeriodicalLcdMark,       periodicalLcdMark,          0,                    20    ; every 2s
+  .dw sramTimerWriteStats,         writeStats,                 0,                   100
+#endif
+#ifdef MODULES_SI7021
+  .dw sramTimerSI7021Measure,      SI7021_PeriodicMeasurement, 0,                   300    ; every 30s
+  .dw sramTimerSI7021SendTemp,     sendTemp,                   TIMER_FLAGS_IF_ADDR, 600    ; every 60s
+  .dw sramTimerSI7021SendHumidity, sendHumidity,               TIMER_FLAGS_IF_ADDR, 600    ; every 60s
+#endif
+#ifdef MODULES_CNY70
+  .dw sramTimerCny70SendAdc,       CNY70_OnTimer,              TIMER_FLAGS_IF_ADDR, 50    ; every 5s
+#endif
+  .dw 0 ; end of list
+
+
+
+
+
+.include "main.asm"
+
+
+; ---------------------------------------------------------------------------
+; Called on first time run, i.e. on system start. No arguments, no results.
+
+onSystemStart:
+  ret
+
+
+#ifdef MODULES_LCD
+periodicalLcdMark:
+  rcall printTimerMark
+  ret
+
+
+writeStats:
+  rcall printSendStats
+  ret
+#endif
+
+
+
+#ifdef MODULES_SI7021
+
+sendHumidity:
+  rcall SI7021_SendHumidity
+  brcs sendHumidity_okay
+  ; set timer to 1s to retry later
+  ldi xl, LOW(sramTimerSI7021SendHumidity)
+  ldi xh, HIGH(sramTimerSI7021SendHumidity)
+  rjmp Timer_SetValueTo1s
+sendHumidity_okay:
+  ret
+
+
+sendTemp:
+  rcall SI7021_SendTemp
+  brcs sendTemp_okay
+  ; set timer to 1s to retry later
+  ldi xl, LOW(sramTimerSI7021SendTemp)
+  ldi xh, HIGH(sramTimerSI7021SendTemp)
+  rjmp Timer_SetValueTo1s
+sendTemp_okay:
+  ret
+
+#endif
+
+
+
+; ---------------------------------------------------------------------------
+; Called every 100ms. Add your routine calls here. No arguments, no results.
+
+onEvery100ms:
+#ifdef MODULES_LED
+  ; ticker for LED module
+  ldi zl, LOW(ledA3Flash)
+  ldi zh, HIGH(ledA3Flash)
+  ldi yl, LOW(ledA3Sram)
+  ldi yh, HIGH(ledA3Sram)
+  rcall Led_Tick
+#endif
+
+#ifdef MODULES_LED_SIMPLE
+  rcall LedSimple_Every100ms
+#endif
+
+#ifdef MODULES_REED
+  rcall REED_Every100ms
+#endif
+
+  ret
+
+
+
+; ---------------------------------------------------------------------------
+; onPacketReceived:
+;
+; Called after a packet was received via COM module. Add your routine calls here.
+;
+; The packet will be released in any case after return from this call.
+; IN:
+; - X  : pointer to received buffer
+; OUT:
+; - CFLAG: set if handled, cleared otherwise
+; USED: depending on called routines
+
+onPacketReceived:
+  rcall CPRO_OnPacketReceived
+  ret
+
+
+