Readout of VBus interface Protocol 1.0 by Arduino and transfer of data via HTTP GET requests to Domoticz home automation software (or to other systems).
Readout the Resol VBus interface of an Oranier Aquacontrol III (= rebranded Resol DeltaTherm FK).
Transfer of data via ethernet to Domoticz home automation software.
This sketch reads the VBus data and depending on the format of the controller decodes the data and puts it in variables. You can then send the values via HTTP GET requests to Domoticz or do whatever you want with it. Usage is not limited to Domoticz, you can extract the decoding part for other purposes.
This sketch has been running continuously on an Arduino since October 2015 without any problem whatsoever.
Currently supports the following controllers:
- Resol DeltaTherm FK (0x5611)
- Oranier Aquacontrol III (0x5611)
- Conergy DT5 (0x3271)
- Joule / Resol Deltasol C (0x4212)
If it does not find any of the supported controllers, it will try to decode the first 2 frames which usually contain Temp 1 to 4.
- VBus RX interface circuit
- Arduino Mega + Wiznet Ethernet Shield
- Device running your Domoticz
VBus is NOT RS485. So you need a specific converter circuit to make the VBus data readable for the Arduino UART.
I used the following circuit from Piamble:
I only removed the final voltage divider after the comparator and put a series resistor there instead because the Arduino has a 5V compatible UART.
This sketch uses the Arduino Mega and the Wiznet 5100 ethernet shield. You can also use another Arduino like the Uno but that one only has one hardware serial port.
Serial1 is used for the VBus module. Serial is used to debug the output to PC. Vbus serial works with 9600 Baudrate and 8N1.
Arduino Mega:
- Serial on pins 0 (RX) and 1 (TX),
- Serial1 on pins 19 (RX) and 18 (TX),
- Serial2 on pins 17 (RX) and 16 (TX),
- Serial3 on pins 15 (RX) and 14 (TX).
Arduino non-Mega: You can use f.i. AltSoftSerial() instead of Serial1. This sketch should work with AltSoftSerial. If you do use it, you need to put the VBus input on the correct softserial pin! If you do not need the debugging option, use 'normal' Serial.
Go to http://danielwippermann.github.io/resol-vbus/vbus-packets.html and find your controller. In the list you can see which information the controller sends. You need the controller ID and offset, bitsize and names of all the variables. Now use the examples for the DT5 and FK in VBusRead() to create a new entry for your own controller. This might be not that easy. Do not forget to properly declare your new variables too.
If you have tested it and it works, please add a Pull request so I can integrate your controller here.
No. First try it yourself. But if you fail, you can always ask.
Not by any means, but it works. If you have any remark or improvement, let the author know.
Maybe, but this allows for better modification by myself or others. Also depending on the Arduino you need to set another Serial port. This is easier to do in the sketch.
If you want to use it as a library have a look here [https://github.com/FatBeard/vbus-arduino-library].
This is still on my to do list. I started with the HTTP GET request because I was unaware of MQTT and also at the time the MQTT support in Domoticz lacked proper documentation. But the HTTP GET requests are working just fine for about 2 years now.
Sketch is based on the VBus library from 'Willie' from the Mbed community. Also have a look at the Github of Daniel Wippermann, the lead software engineer of Resol. He has written lots of useful code for you to use in interfacing with Resol equipment.
The MIT License. This means that you can do whatever you want with my code! No need to ask me. It is always nice however to publish your version to Github to help others.
RESOL, VBus, VBus.net and others are trademarks or registered trademarks of RESOL - Elektronische Regelungen GmbH.
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