This sketch allows an Arduino to listen to messages sent by devices in the ELV Max! heating control system.
The ELV Max! system allows automatic control of radiator valves, but misses a central control of the boiler, it assumes that the hot water supply is always on.
This sketch allows the Arduino to listen to the messages from the ELV Max! devices and switches on the boiler (through a relay) when there is (sufficient) heat demand in the radiator valves.
It also serves as a debug tool to display all received packets, which helps to reverse engineer the RF protocol.
Finally, it can log all status updates it receives, so you can use other tools to draw graphs or keep other statistics.
Debug and logging output is presented over serial, but can also be sent through TCP when an Arduino Ethernet or Ethernet shield is used.
This tool is still a work in progress.
This sketch uses the RF22 library for the RF communication. However, the RF22 hardware is not perfectly suited to communicate with the ELV Max!, so it needs some patching. The patched library is available here:
https://github.com/matthijskooijman/RF22
Furthermore, the sketch uses the TStreaming library to get more consise printing and formatting, which can be found at:
https://github.com/matthijskooijman/TStreaming
Finally, the TStreaming library and parts of the sketch are programmed
using new C++ features, from the C++11 standard. This requires the
program to be compiled using the -std=c++11 gcc option. Since the
Arduino IDE does not support passing custom options to gcc, this sketch
cannot be compiled using the Arduino IDE currently.
The recommended way of compiling this sketch is to use the Arduino-mk Makefile, available at:
https://github.com/mjoldfield/Arduino-Makefile
This sketch ships a Makefile that includes files from the above
repository to do its work. It assumes you have a $(ARDMK_DIR) variable
in your shell that points to a checkout of the above repository.
If you have that, run make to compile the sketch, make size to get a
memory usage report and make upload to upload the sketch.
Inside MaxRFProto.cpp, there is a hardcoded list of known devices, of which state is kept. Leaving the list empty will just add any devices when a message from or to them is reveived (up to a number of devices hardcoded in MaxRFProto.h). Adding devices to the list helps to give them a name and let the code know about the device type (which cannot always be determined automically).
This code is licensed under the MIT license:
Copyright (c) 2013 Matthijs Kooijman matthijs@stdin.nl
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.