HW- and SW-parts to receive/transmit seriell data from/to heating-system.
Table of Contents
This hardware is designed for serial data-communication between 'heater-bus' and external controlling software.
Currently only heater-systems from german manufacturer: Junkers/Bosch and system-bus: Heatronic/EMS2 (c) are supported.
There are two active boards (alias name: ht_transceiver) created for the RaspberryPi(c).
They differs only in hardware-design and used uC's but have the identical functionality.
The components on the 'ht_piduino-board' are 'MTH' (Mounted Through Hole) and the 'ht_pitiny-board' has SMD (Surface Mounted Devices) components.
The 'ht_pitiny-board' is a bit more tiny and is using less space on the RaspberryPi.
The table shows the currently available active boards:
| Board-name | function | Comment | Interface |
|---|---|---|---|
| ht_pitiny | transmit- and receiving Bus - data | active ht_transceiver-board for RPi using ATtiny841. |
serial asynchronous data. 9600Baud to/from heater-bus. 19200Baud to/from RPi. |
| ht_piduino | transmit- and receiving Bus - data | active ht_transceiver-board for RPi using ATMega328. |
serial asynchronous data. 9600Baud to/from heater-bus. 19200Baud to/from RPi. |
- Modul: ht_pitiny
- Modul: ht_piduino
For the 'ht_transceiver'- hardware see gerber-files and documentation (folder: ~/hometop_ht_transceiver/hw )
and project: hometop_ht.
The software is written in c and cpp and designed for receiving and transmitting heater-busdata with following features:
| SW-Part | function |
|---|---|
| receive heater-busdata | Receiving heater-bus data. Break-Signal detection. Sending received message attached with header to external decoding-SW. |
| receive external commands for heater-bus | Receiving commands for the heater-bus. Break-Signal generation. Sending generated command-block to heater-bus. |
| receive external commands for board-setup | Receiving commands for ht_transceiver-board setup. Own Device ID change. Reset of ht_transceiver. |
| Modul device ID handling | Own Device ID detection. Generating polling-answers. Sending polling-answers to heater-bus. |
SW-Release generation is done with: Atmel Studio 7 (Version: 7.0.2397), but any leater Revision should work.
There are some preconditions to install or update the software on any ht_transceiver-board.
- Board must be checkt, mainly that external CPU-crystal must be workable.
- Board has to be mounted on RaspberryPi.
- Any heater-bus connection must be disconnected.
- 'avrdude' must not be installed manually with 'apt install avrdude', cause the default one has no lib: 'linuxgpio' available.
- 'sudo' must be enabled for the user.
- That interface: 'SPI' on RaspberryPi has to be 'disabled'. This will be forced by the installation-script.
Step into folder:
cd hometop_ht_transceiver/sw
Call the installaton-script for:
| Board-name | script-name | function |
|---|---|---|
| ht_pitiny | prepare_pitiny_board.sh | 1.check platform. 2.check SPI-IF. 3.Install and compile avrdude if not already done. 4.Setup fuses. 5.Flash latest sw-release. 6.Write eeprom-data. |
| ht_piduino | prepare_piduino_board.sh | 1.check platform. 2.check SPI-IF. 3.Install and compile avrdude if not already done. 4.Setup fuses. 5.Flash latest sw-release. 6.Write eeprom-data. |
- Check the output on the installation-terminal for any errors.
- Check the green flashing LED on the 'ht_transceiver-board'. If no flashing LED is visable, some errors had occurred.
- Switch off RaspberryPi and reconnect the 'ht_transceiver-board' to the heater-bus.
For 'ht_transceiver'-description see the documentation (folder: ~/hometop_ht_transceiver/docu ).
Hardware:cc by-nc-sa 4.0 (details)