Now it is time to write something about the control of the system. I use 4 Somfy motors (Somfy Sonesse ILT 504S2 Star Head Ultra Quiet Motor) and this provides the possibility to choose framing without limitations. Almost the whole front wall is one giant screen and I let the masks make a framing around the picture and immediately the picture looks sharper and appear to have more contrast.
Each motor is connected through a modular cable RJ9 to an interface (Somfy RS485 4ILT interface). Connected to the interface is also an IR sensor. The interface can control up to 4 Somfy ILT-motors at the same time and can memorize 8 positions in each motor.
The remote control has 8 buttons that are marked from 1 to 8 and by pressing one of these buttons all 4 motors will run and roll in or roll out the speaker fabric to an earlier decided position.
Each mask can be adjusted individually with the remote control. You can also make the mask first move quickly and than move slowly. Perfect when you want to fine-tune!
I bought 110 volt motors and use converter for the 230 volt here in Norway. The interface can use both 110 volt and 230 volt without extern converter.
The first time you program the interface, first position the mask to the end positions (that is max in and max out). Then you frame for example 2.35:1 and press the button 1 for a while and then the interface will remember all 4 motors positions and every time you press button number 1 you will have the format 2.35:1. It cannot be easier!
But you can also do perfectly well without the interface and use more simplified Somfy motors that don`t have unlimited positions in the memory. There are motors that can remember 3 positions- max in, max out and one position in between that you choose. You can then have one 4:3-picture as max in and one 2.40:1 as max out and 1.78 as the position in between. In that case you need to buy a “limit setting tool” but you will nonetheless save money.
You can see the Somfy IR sensor here: