diff --git a/avr/devices/t04/.gitignore b/avr/devices/t04/.gitignore
new file mode 100644
index 0000000..8e0618c
--- /dev/null
+++ b/avr/devices/t04/.gitignore
@@ -0,0 +1,2 @@
+*.eep.hex
+*.obj
diff --git a/avr/devices/t04/0BUILD b/avr/devices/t04/0BUILD
new file mode 100644
index 0000000..2775440
--- /dev/null
+++ b/avr/devices/t04/0BUILD
@@ -0,0 +1,22 @@
+
+
+
+
+
+ boot
+ main
+
+
+
+ aqua_t04.xml
+
+
+
+ defs.asm
+ README
+
+
+
+
+
+
diff --git a/avr/devices/t04/README b/avr/devices/t04/README
new file mode 100644
index 0000000..0d2ffb6
--- /dev/null
+++ b/avr/devices/t04/README
@@ -0,0 +1,13 @@
+
+T04
+===
+
+- Role: COM-PC-Interface
+- MCU: AtTiny841
+- Connection: RJ45
+- Predecessor: none
+- UART: UARTFD0, COM2W
+- Periphery:
+ - OWI interface
+ - DS18B20 temperature sensor
+
diff --git a/avr/devices/t04/aqua_t04.xml b/avr/devices/t04/aqua_t04.xml
new file mode 100644
index 0000000..4f7ffd9
--- /dev/null
+++ b/avr/devices/t04/aqua_t04.xml
@@ -0,0 +1,11 @@
+
+
+ AQUA
+ T
+ 4
+
+
+
+
+
+
diff --git a/avr/devices/t04/boot/0BUILD b/avr/devices/t04/boot/0BUILD
new file mode 100644
index 0000000..e5e0cd5
--- /dev/null
+++ b/avr/devices/t04/boot/0BUILD
@@ -0,0 +1,32 @@
+
+
+
+
+
+
+
+ -I $(builddir)
+ -I $(srcdir)
+ -I $(topsrcdir)/avr
+ -I $(topbuilddir)/avr
+
+
+
+
+ boot.asm
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/avr/devices/t04/boot/boot.asm b/avr/devices/t04/boot/boot.asm
new file mode 100644
index 0000000..2f9fa66
--- /dev/null
+++ b/avr/devices/t04/boot/boot.asm
@@ -0,0 +1,150 @@
+; ***************************************************************************
+; 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
+.equ clock=8000000 ; Define the clock frequency
+
+.nolist
+.include "include/tn841def.inc" ; Define device ATtiny841
+.list
+
+.include "version.asm"
+.include "../defs.asm"
+.include "devices/all/defs.asm"
+
+.include "common/calls.asm"
+.include "common/utils_wait.asm"
+
+
+
+; ***************************************************************************
+; defines
+
+
+;#define COM_ACCEPT_ALL_DEST 1
+
+
+
+; ---------------------------------------------------------------------------
+; LED
+
+.equ LED_DDR = DDRB
+.equ LED_PORT = PORTB
+.equ LED_PIN = PINB
+.equ LED_PINNUM = PORTB2
+
+
+; ***************************************************************************
+; code segment
+
+.cseg
+.org 0x0000
+
+
+
+; ---------------------------------------------------------------------------
+; Reset and interrupt vectors
+
+ rjmp main ; 1: RESET Reset vector use this for flashed system
+ reti ; 2: INT0 External Interrupt Request 0
+ reti ; 3: PCINT0 Pin Change Interrupt 0
+ reti ; 4: PCINT1 Pin Change Interrupt 1
+ reti ; 5: WDT Watchdog Time-out
+ reti ; 6: TIM1_CAPT Timer/Counter1 Capture Event
+ reti ; 7: TIM1_COMPA (OC1A) Timer/Counter1 Compare Match A
+ reti ; 8: TIM1_COMPB (OC1B) Timer/Counter1 Compare Match B
+ reti ; 9: TIM1_OVF (OVF1) Timer/Counter1 Overflow
+ reti ; 10: TIM0_COMPA (OC0A) Timer/Counter0 Compare Match A
+ reti ; 11: TIM0_COMPB (OC0B) Timer/Counter0 Compare Match B
+ reti ; 12: TIM0_OVF (OVF0) Timer/Counter0 Overflow
+ reti ; 13: ANA_COMP0 Analog Comparator 0
+ reti ; 14: ADC_READY ADC Conversion Complete
+ reti ; 15: EE_RDY (ERDY) EEPROM Ready
+ reti ; 16: ANA_COMP1 Analog Comparator 1
+ reti ; 17: TIM2_CAPT Timer/Counter2 Capture Event
+ reti ; 18: TIM2_COMPA (OC2A) Timer/Counter2 Compare Match A
+ reti ; 19: TIM2_COMPB (OC2B) Timer/Counter2 Compare Match B
+ reti ; 20: TIM2_OVF (OVF2) Timer/Counter2 Overflow
+ reti ; 21: SPI SPI Serial Transfer Complete
+ reti ; 22: USART0_RXS USART0 Rx Start
+ reti ; 23: USART0_RXC USART0 Rx Complete
+ reti ; 24: USART0_DRE USART0 Data Register Empty
+ reti ; 25: USART0_TXC USART0 Tx Complete
+ reti ; 26: USART1_RXS USART1 Rx Start
+ reti ; 27: USART1_RXC USART1 Rx Complete
+ reti ; 28: USART1_DRE USART1 Data Register Empty
+ reti ; 29: USART1_TXC USART1 Tx Complete
+ reti ; 30: TWI Two-Wire-Interface
+ reti ; 31: RESERVED reserved
+
+
+
+devInfoBlock: ; 12 bytes
+devInfoManufacturer: .db 'A', 'Q', 'U', 'A'
+devInfoId: .db DEVICEINFO_ID, 0
+devInfoVersion: .db DEVICEINFO_VERSION, DEVICEINFO_REVISION ; 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/bootloader/main.asm
+
+
+
+
+; ***************************************************************************
+; includes
+
+.include "common/utils_wait_fixed.asm"
+.include "common/utils_copy_from_flash.asm"
+.include "common/utils_copy_sdram.asm"
+.include "modules/flash/defs.asm"
+.include "modules/flash/eeprom.asm"
+.include "modules/flash/io.asm"
+.include "modules/flash/io_uart0.asm"
+.include "modules/flash/io_uart_all.asm"
+.include "modules/flash/flashxp.asm"
+.include "modules/flash/flash4p.asm"
+.include "modules/flash/flashprocess.asm"
+.include "modules/flash/wait.asm"
+.include "modules/bootloader/main.asm"
+.include "modules/network/msg/defs.asm"
+.include "modules/network/msg/crc.asm"
+
+
+
+systemSetSpeed:
+.if clock == 1000000
+ ldi r17, 0xd8
+ ldi r16, (1<
+
+
+
+
+
+
+ -I $(builddir)
+ -I $(srcdir)
+ -I $(topsrcdir)/avr
+ -I $(topbuilddir)/avr
+
+
+
+
+ main.asm
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/avr/devices/t04/main/main.asm b/avr/devices/t04/main/main.asm
new file mode 100644
index 0000000..b292af4
--- /dev/null
+++ b/avr/devices/t04/main/main.asm
@@ -0,0 +1,246 @@
+; ***************************************************************************
+; 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. *
+; ***************************************************************************
+
+
+
+
+; ***************************************************************************
+; 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
+.equ clock=8000000 ; Define the clock frequency
+
+
+.nolist
+.include "include/tn841def.inc" ; Define device ATtiny841
+.list
+
+.include "../defs.asm"
+.include "version.asm"
+;.include "defs_all.asm"
+
+.include "devices/all/defs.asm"
+
+.include "common/calls.asm"
+.include "common/utils_wait.asm"
+.include "common/utils_io.asm"
+
+
+
+; ***************************************************************************
+; defines
+
+; ---------------------------------------------------------------------------
+; generic
+
+.equ COMONUART0_IFACENUM = 1
+.equ TTYONUART0_IFACENUM = 2
+
+
+; debug
+
+;.equ T03_FLAGS_ALLOC = 0x01
+;.equ T03_FLAGS_I1_SKIPPING = 0x02
+;.equ T03_FLAGS_I1_RESTARTED = 0x04
+;.equ T03_FLAGS_ADDIN = 0x08
+;.equ T03_FLAGS_I1_ADDOUT = 0x10
+;.equ T03_FLAGS_I2_ADDOUT = 0x20
+
+
+
+; ---------------------------------------------------------------------------
+; firmware settings including list of modules used
+
+
+#define MAIN_WITHOUT_MSG_HANDLING ; we do message handling ourselfes
+#define COM_ACCEPT_ALL_DEST ; accept all messages!
+#define APP_STATS_NETDEV2
+#define APP_ROUTER_NO_ADDR_MGR
+
+#define MODULES_CLOCK
+;#define MODULES_COM
+;#define MODULES_COM_WITH_ADDR_PROTO
+;#define MODULES_LED
+;#define MODULES_LED_SIMPLE
+;#define MODULES_LED_SIGNAL
+#define MODULES_LED_ACTIVITY
+;#define MODULES_TWI_MASTER
+;#define MODULES_LCD
+;#define LCD_MINIMAL_FONT
+;#define MODULES_SI7021
+;#define MODULES_STATS
+;#define MODULES_CNY70
+;#define MODULES_REED
+;#define MODULES_OWI_MASTER
+;#define MODULES_DS18B20
+;#define MODULES_MOTION
+#define MODULES_NETWORK
+#define MODULES_COM2W
+;#define MODULES_COMONUART0
+;#define MODULES_TTYONUART1
+#define MODULES_UARTFD0
+#define APPS_STATS
+;#define APPS_NETWORK
+;#define APPS_ROUTER
+#define APPS_FORWARDER
+
+
+
+.equ NET_BUFFERS_NUM = 10
+.equ NET_MSGNUMINBUF_SIZE = 8 ; max buffer nums in ringbuffer (global incoming)
+.equ NET_IFACE_OUTMSGBUF_SIZE = 8 ; max buffer nums in ringbuffer (per interface outbound)
+
+
+
+
+; ---------------------------------------------------------------------------
+; defines for values
+
+.equ VALUE_ID_DS18B20_TEMP = 0x06
+
+.equ VALUE_ID_LEDSIMPLE_TIMING = 0x88
+.equ VALUE_ID_ROUTER_SETRANGE = 0x89
+
+
+
+; ***************************************************************************
+; code segment
+
+.cseg
+.org 000000
+
+
+
+; ---------------------------------------------------------------------------
+; Reset and interrupt vectors
+
+ rjmp BOOTLOADER_ADDR ; 1: RESET Reset vector use this for flashed system
+ reti ; 2: INT0 External Interrupt Request 0
+ rjmp com2wPcintIsr ; 3: PCINT0 Pin Change Interrupt 0
+ reti ; 4: PCINT1 Pin Change Interrupt 1
+ reti ; 5: WDT Watchdog Time-out
+ reti ; 6: TIM1_CAPT Timer/Counter1 Capture Event
+ reti ; 7: TIM1_COMPA (OC1A) Timer/Counter1 Compare Match A
+ reti ; 8: TIM1_COMPB (OC1B) Timer/Counter1 Compare Match B
+ reti ; 9: TIM1_OVF (OVF1) Timer/Counter1 Overflow
+ rjmp baseTimerIrqOC0A ; 10: TIM0_COMPA (OC0A) Timer/Counter0 Compare Match A
+ reti ; 11: TIM0_COMPB (OC0B) Timer/Counter0 Compare Match B
+ reti ; 12: TIM0_OVF (OVF0) Timer/Counter0 Overflow
+ reti ; 13: ANA_COMP0 Analog Comparator 0
+ reti ; 14: ADC_READY ADC Conversion Complete
+ reti ; 15: EE_RDY (ERDY) EEPROM Ready
+ reti ; 16: ANA_COMP1 Analog Comparator 1
+ reti ; 17: TIM2_CAPT Timer/Counter2 Capture Event
+ reti ; 18: TIM2_COMPA (OC2A) Timer/Counter2 Compare Match A
+ reti ; 19: TIM2_COMPB (OC2B) Timer/Counter2 Compare Match B
+ reti ; 20: TIM2_OVF (OVF2) Timer/Counter2 Overflow
+ reti ; 21: SPI SPI Serial Transfer Complete
+ reti ; 22: USART0_RXS USART0 Rx Start
+ rjmp UARTFD0_RxCharIsr ; 23: USART0_RXC USART0 Rx Complete
+ rjmp UARTFD0_TxUdreIsr ; 24: USART0_DRE USART0 Data Register Empty
+ rjmp UARTFD0_TxCharIsr ; 25: USART0_TXC USART0 Tx Complete
+ reti ; 26: USART1_RXS USART1 Rx Start
+ reti ; 27: USART1_RXC USART1 Rx Complete
+ reti ; 28: USART1_DRE USART1 Data Register Empty
+ reti ; 29: USART1_TXC USART1 Tx Complete
+ reti ; 30: TWI Two-Wire-Interface
+ reti ; 31: RESERVED reserved
+
+
+
+devInfoBlock: ; 12 bytes
+devInfoManufacturer: .db 'A', 'Q', 'U', 'A'
+devInfoId: .db DEVICEINFO_ID, 0
+devInfoVersion: .db DEVICEINFO_VERSION, DEVICEINFO_REVISION ; version, revision
+firmwareVersion: .db FIRMWARE_VARIANT_TEMP_WINDOW, FIRMWARE_VERSION_MAJOR
+ .db FIRMWARE_VERSION_MINOR, FIRMWARE_VERSION_PATCHLEVEL
+
+
+
+; ---------------------------------------------------------------------------
+; @routine firmwareStart @global
+
+firmwareStart:
+ rjmp main
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine onSystemStart
+
+onSystemStart:
+ ldi r16, 0xf0
+ sts netInterfaceData+NET_IFACE_OFFS_ADDRESS, r16
+ sts netInterfaceData2+NET_IFACE_OFFS_ADDRESS, r16
+ ret
+; @end
+
+
+
+onEvery100ms:
+onEverySecond:
+onEveryMinute:
+onEveryHour:
+onEveryDay:
+ ret
+
+
+
+; ---------------------------------------------------------------------------
+; @routine onEveryLoop
+;
+; Called on every loop (i.e. after awakening from sleep).
+
+onEveryLoop:
+ ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine onMessageReceived
+;
+; Called on every message received
+
+onMessageReceived:
+ clc
+ ret
+; @end
+
+
+
+
+
+
+; ***************************************************************************
+; includes
+
+.include "devices/all/hw_tn841.asm"
+.include "devices/all/includes.asm"
+.include "common/debug.asm"
+
+
+
+
+; ---------------------------------------------------------------------------
+; defines for network interface
+
+.equ netInterfaceData = uartFd0_iface
+.equ netInterfaceData2 = com2w_iface
+
+