Analog Conversion

[Daniel Feist]

Hi,

Does anyone have any idea how to convert the analogue output on the left to the analogue output on the right to work around a bug in Loxone DALI DT8 support which doesn't respect the minimum dim level configured?

Thanks,

[Jonathan Dixon]

(I assume you mean convert the signal in Loxone Config, not build an analogue circuit from discrete electrical components to do it)

A formula block should do it, with camping for input less than 1, e.g.

IF(I1<1;0;IF(I1>100;254; 87+ (254-87)*(I1-1)/(99)))

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[Daniel Feist]

Yes, I'm waiting on Loxone to fix the bug in their DT8 support.  I also ideally need this with outputs to my ATX LED DALI board anyway.  Let me have a go with the formula block You can't use "correction" in the virtual input, else fitting never turns off :-)

Ideally, it should be parameterizable, but to do this requires a reverse look-up using DALI dimming curve data or the use of a log function, so I think I'll stick to two hardcoded versions.  All my fittings are either 0.1%, 1% or 5% minimum.

Min 1% -> 87

Min 5% -> 145 

On a side note, my 0.1% minimum fittings are fantastic and support very low levels of light plus the ability to dim from/to zero is really cool.  It also means that if you have multiple DALI groups that get triggered sequentially to create a mood, you can't notice the delay.  On the other hand, my 5% minimum fittings (track lights) really annoy me now I got used to 0.1/1% everywhere else in the house. 5% is actually 57% on the linear perception scale!

The other issue is that I can't really use groups as I hoped with min 5% (with one group being a subset of another)  as you see fittings the turning off sequentially. That said, this is probably slightly worse than it would be if I were using the Loxone DALI extension due to additional HTTP hop.

Thanks,

[Jonathan Dixon]

Yeah I have a parameterized version of this formula that I use many places by loading constants onto the I2-I4 inputs to set the  input domain and minimum switch on level.

0.1% switch on is incredible. (Is that actually 0.4%? i.e. 1/255). I have a lot of mains dim stuff that only comes on at 30% which is very janky when used with a fade.

>  You can't use "correction" in the virtual input, else fitting never turns off :-)

Yeah indeed. It's a shame the Loxone Lighting Controller doesn't just let you set a minimum switch-on level per circuit. (And ideally, and strike/warm up level as Shelly dimmers now have) - to insert a formula like this means using "Standard" rather than Smart device types (on DMX outputs) which in turn loses  fade-time support.

(I've also found some window openers need this correction formula - at least one I use doesn't actually open until it's 15% open according to the Loxone interpolated idea of where it should be, the initial 5-10s runtime is just spent undoing the cams)

[Daniel Feist]

> 0.1% switch on is incredible. (Is that actually 0.4%? i.e. 1/255). I have a lot of mains dim stuff that only comes on at 30% which is very janky when used with a fade.

These are the Orluna fittings which use EldoLED drivers.  1/255 is 0.1% on the DALI dimming curve. 0.4% is ARC Level 52/255.

All my LEDs (also using EldoLED) are supposed to be 0.1% too, but there is some weird issues with the waveform produced by the drivers and the current-regulating IC on the LED strip which means that anything below 0.5% (43% on the perceived scale) produces a patchy output :-(.  Of course, neither EldoLED nor the tape manufacturers say it's their issue and given it's only 0.1->0.5% range impacted, while annoying, it's not something worth investing too much time in pursuing a solution for.

> Yeah indeed. It's a shame the Loxone Lighting Controller doesn't just let you set a minimum switch-on level per circuit.

Yeah, although you could argue that if you are sticking to the Loxone extensions/devices, these values can already be configured per fitting/group.