Blind slats angle with shelly 2.5

[AP]

I'm using a shelly 2.5 to control my blinds. This works with the original shelly firmware more or less good. The only problem is that i can't control the angle of the blind slats.

I'm using Tasmota for a few other applications and it would be easy to change the firmware on the shelly to Tasmota but will i get any control about the angle of the slats or is this not possible.

Thanks for your answers...

[Christian Brandau]

I think there is no possibility to track the precise current angle, so you can't send a respective command to change it to a certain value. Even with a manual switch you can only control it by the combination of direction and duration based on the current status.

Independently from the firmware you use, you can try this to at least change just the direction:

Create a dummy switch in your smarthome system that reacts on a script like this:

IF last action was close

DO open for X seconds

ELSE IF last action was open

DO close for X second

Maybe you can try different times (e. g. 1; 2 or 3 seconds) in order to control not only the direction but also the angle.

[Gemikro]

Yes, this is possible. I am using too Shelly 2.5 to control venetian blinds.

You have to define two roller shutters in Tasmota (i am using 9.2.0) using the same relay output.

The timing of the first has to be set to the full range Up/Down and the second only the time it takes to tilt the slats from Open to Closed.

After setting this up, there is a second slider visible on the Tasmota main menu which then controls the angle.

This works quite well on my Shellys but the granularity of the angle is a bit too low for my taste.

My blinds take about 45 seconds to open and the time to change the angle from open to closed is only 1.4 seconds.

I think this causes the problem as the resolution seems to be determined by the timing first shutter (but i may be wrong, i have to check the shutter code...).

I can control the angle of the slats in about 5 steps which is ok but with 10 or more the handling experience would be much better.

This should be possible as the timing resolution of Tasmota is 50ms so it should be possible to have 28 steps in 1.4 seconds.

I can send you the configuration commands if you need them.

Currently i have configured two percentage sliders in openHAB  to send 0 to 100% for the opening to shutter1 and 0 to 100% for shutter2 for the angle and this works very well.

Gemikro