having a Brink Renovent HR Medium myself, would anyone know where to start looking whether this could be a solution for that machine too?
I have an extra board (Optie Print) installed providing connectors to external buttons sensors etc.
Id love to add an esphome and be able to switch the fan from 0 to 1,2,3.
)ofc, read out the other stuff too 
)
Any pointer would be appreciated hugely
@Mariusthvdb
I think you have to take a look at Open Therm as the renovent has no modbus
Repository search results (github.com)
thanks! a new world opens upā¦ I never realized so many people active on the matter. nice.
@Mariusthvdb
Maybe this one can be usefull
christiaanderidder/brink-renovent-hru: A guide and configuration for automating the Brink Renovent heat recuperation unit (HRU) (github.com)
yeah, all of them are interesting, but require a great deal of tinkeringā¦
thing is I have this:
and would for now only seek to replace that mechanical switch with a boardā¦
sounds simpler than it probably is thoughā¦
Too bad there is not a Tinkerer among the Brink tech department that would connect and open up to the HA community.
All they do notoriously do is create closed systems, requiring cloud and wont be openend up by an Api
I mean, I once had a tech guy here, and he opened his laptop, connected it to the Unit and controlled all of itā¦ So it can be done for sure, didnt require any additional hardware between the pc and Renovent.
If only
@Mariusthvdb
Probably just connect an esp wifi relay board
WiFi ESP32 Module with 2 Relays, ESP32LR20 - Antratek Electronics
or with inputs:
WiFi ESP32 Module with 4 Relays & 2 Inputs, ESP32LR42 - Antratek Electronics
Example code i have.
I use the 4 relay board to readout S0 on kWh meter and to switch my heatpump to 50/75/100% capacity
Or use one of these (230V powered)
Inspired by this topic I wrote coding lines for controlling a Brink Flair 400 HRU via modbus and with a ESP8266 board. This coding is used for automatically optimizing the bypass and manually control the HRU with Home Assistant.
In the comments I added links to relevant websites or documents for making adaptions easier if necessary in your situation.
Hi guys, I am very fresh member in here and just discovered this topic. My first and crucial question - got Brink 400 yesterday, but without WiFi (Plus) module. Is it must have to work with home assistant, or do I need another modbus adaptor? Its not an issue to order the board and plug it in, but question is if it worth 500 bucks.
Thanks, Tom
Feels a little bit like you re-invented the wheel.
I have a Brink Flair 400 connected with Home Assistant without that Plus module. Only an ESPboard like ESP8266 (my solution) or ESP32 (better) is needed. ESPboards have, among other inputs, an UART input and send that signal over WIFI. You also need a modbus to UART convertor and have to solder some wires. The first item of this topic describes how you have to connect this. If you donāt like soldering, in this topic is also an offer how you can purchase a wired set in a box. Above your question I have added a link to my software solution for this hardware including references to background information in case you use other hardware than I have.
Well, your software inspired me but you only included the coding for a few number- registers and I needed more. Your solution didnāt work for me on the boards I had because these required illogical connections between my ESP8266 board and the UART - modbus convertor to start with and as a ESPhome newby it was difficult for me to find and understand the relevant documentation. You advised above to use a more modern chip, I agree with that but I already had a ESP8266 board and wanted to give it a try.
The solution I describe has more than 30 registers, including examples of lambda coding for registers that have to addressed with text_sensor for example with specific links to the documentation. I also describe my experience with the ESP8266: this chip will do if you donāt need the web server (is not necessary if you use Home Assistant) and use a fixed IP address.
In my solution I also describe examples of how to use this in an automation for Home Assistant. For a little extra saving of energy you can improve the use of the bypass, Brink only partially uses the possibilities of this.
For me itās ok to combine our solutions.
I dont have any plans to improve it further. Thank you.
Good to hear you have implemented some more functions.
Iāve tried to connect my Brink Flair 300 by using Fonskeās code on the M5Stack Lite (none S3) with the M5Stack RS485 Unit.
Unfortunately, once Iāve connected everything I get āUnknownā values for all the entities included within ESPHome.
I double checked if I had the right order for the cables, I set the communication to Modbus instead of Brinkbus.
Does anyone have a suggestion on how to tackle this issue?
Hi Fonske, ik heb sinds kort een flair 300 en de user interface van brink zelf werkt niet heel fijn. Ik vroeg me af of je nog steeds de connector voor home assistant verkoopt, maar ben erg geĆÆnteresseerd.
@Rutger85
Yes i still have some available
M5stack Atom lite met modbus base (brink flair/itho wtw/etc) aangeboden - Vraag & Aanbod - Tweakers
alphonsuijtdehaag at gmail punt com
@CyberSick99 uses one now also, so problem fixed.
@Fonske The following entries are constantly repeating in my logs when using your code:
Could it be that the on_boot action is stuck?
Plus module is not needed at all, so save yourself the extra 200 EUR 
.
I have a plus module on my 325 which means it is connected to Brinkās portal. It doesnt always work, which is a useless position to be in. I talked to the supplier and they recommended replacing the plus module. Over Ā£300 for the par.t plus as much to install PLUS VAT!! This has accelerated my plan to get Modbus connection working and use HomeAssistant which until now has always ended up on the backburner.
My plan is to remove the plus module and just work off HomeAssistant.
What a horror story, I am sorry!
Do it. I had no prior experience to ESP/Modbus, and somehow managed. With all that tooling being basically done by now, and many people available to help, you should be able to do it somewhat easily.
