Simple ventiliation controller

[Mykel]

Hello,

I'm struggling to create simple system for ventiliation. I have a KNX switch which has two buttons - one for ventiliation speed decrease and one for increase. I need to be able to control ventiliation speed from visualisation too. I have tried to use radio buttons, but seem to not be able to create a system where I could get something like this: 3 speed levels and 0 level to shut down, from the KNX switch incremental button would increase speed one by one (0 - 1 - 2 - 3) but would stop at 3rd speed and wouldn't loop and go back to 0 again, same with decremental button, I need to decrease speed one by one but at 0 level I don't need it to go to 3rd speed if button is pressed again. Also, I need to have some kind of feedback between KNX switch and loxone, because if I would change speed in visualisation, I need that if I press incremental button on KNX switch it would go one level up from the one was set in visualisation. Radio buttons "kind of" works, but it always loops if I use the ("+", "-") inputs for KNX switch buttons. This is such a simple task, yet I can't find a good solution, maybe you guys, loxone experts, could help me out with this? 

P.S The ventiliation is controlled with 0-10V input, 0V - ventiliation off, 10V - maximum speed.

Thank You.

[Duncan]

one of many options is to use a radio button with the 2 buttons on the + and - then connect aq output to a 4 way analog multiplexer - use virtual analog inputs (0-10) on the ai inputs of the multiplexer to set your speeds and connect the multiplexer AQ output to your 0-10v output

[Mykel]

Yes, I had such setup before. But as I said, it just loops through the speeds and I don't get the effect, that if I go up to 3rd speed, it wouldn't go to 0 if button for speed increase is pressed.

[Duncan]

sounds like an issue with the radio button - have you got a screen shot of its configuration?

[Mykel]

Yes, here is the connections and radio button config:

[Duncan]

cant see anything obvious - i have a few of these cycling round radio favourites fine

have you tried deleting the radio button and creating again from scratch? sometimes this is the only recourse to dodgy blocks...

[Mykel]

Yes, I have tried that many times :D Well, thanks anyway, maybe I'll look for a different solution.

[Tomasz Nowak]

Try this.

T.

[Techdoctor]

What I have done for a simple ventilation controller is to use a switch on and switch off delay block. This is triggered when the bathroom lights go on. But if the occupant only has the light on for less than 5 mins the fan does not come on.  So light on for 5 mins or more the fan goes on and will remain on for 5 mins after the lights are switched off.

This was the simplest solution I could come up with.  I am still in the testing phase with this so I might need to tweak it this week when the new bathroom goes in.

[Mykel]

This solved my problem. Thank You!

[Techdoctor]

Thought I would post the actual  logic etc I used for my simple fan control.

So when either the spots lights or the mirror lights or both come on, it triggers an on delay of 5 minutes. Once we get to 5 minutes the extractor is switched on, and then when the lights are turned off the fan will turn off 5 minutes later.

I also have a direct control button which you can use via the app on my phone should I need to turn it on or off.