TWG wrote:

Keep going with that project please!

We are all over it! ,- but wait! The most important part is missing 😕 The ir Receiver! What are we going to do, if only there was some easy way....

Mechanically it's done, except the cable routing.

Next task is to attach an Oscilloscope and analyze how to control tilt / rotate with that 5 plug wire.
Since the BV7-40 still works, I think I will be able to find a pattern how to control the stand through a NodeMCU. 

To get the BeoLab 7-4 working, I plan to use the "Stereo MiniJack with USB Trigger cable".
https://www.av-connection.de/?PGr=6497

Looking forward to seeing what you find, 2 bits only, Pan Tilt both using the same feedback. it has to be somewhat complicated.

Even more complicated by the fact that the pulses will properly only show, when its detected by the BV, which means you have to cut into the cable, I am not really inclined to do that,- yet

One more thing to look for, the stand is only detected after a power cycle, perhaps some initializing is taking place. 

If you make this part work Ican properly handle the IR part.

Thanks for that! I see they modulate 4 signals on two wires with a voltage level.
Lower voltages at 2.5V control the tilt, higher voltages at 5V control the rotation.

Should not be a problem, just requires some voltage drivers after the GPIO outputs.

Brilliant!

Good engineering, they already properly exhausted the 5V logic bits on the BV7-32,stand and when the 7-40 came along they simply worked below the threshold for the tilt function effectively having 3 states in one bit! Which properly means the control for all the bases of the different stands are identical. And since i have a bunch of 7-32 stand available i would actually make sense for me to dismantle one of those, for som reverse engineering.

What about the feedback,- modulated as well ?

Did you perhaps finish the project? I am looking for the option to potentially rotate the BV 7-40 floorstand with STB brackets‘ VESA holder and Beosound Stage with a Beoremote One.

My question is where can I find cheap vesa mounts for the stand? The only option I found is from stb brackets and costs almost 300$. Is there a cheaper alternative or @drmichi how did you make your custom mount?

I would like to ask curiously whether the B&O Motorstand project has progressed further,

or is there already a prototype for the motor control with BEO4 without B&O TV?

Best regards

AnalogPlanet wrote:

Did you perhaps finish the project? I am looking for the option to potentially rotate the BV 7-40 floorstand with STB brackets‘ VESA holder and Beosound Stage with a Beoremote One.

this documentation could be helpful

TT455-RT-238 - Pulsing output for tv-stand:

http://www.lintronic.dk/AppNote_PulsingOutput.pdf

What has happened with this project..?

I have the floorstand and the Beolab mounted to my Samsung UE55H7205U but it would be nice to be able to control the stand via a remotecontrol.

Is there a ready solution for this?

I´m not so much into building a box myself.

Best regards from Sweden.