Shutters with visualization

Hello all,

I'm trying to made a sterring program for the shutters in my house.

Everythig works fine (closing according to the time, alarm and so on). I wont to show position of the shutter. Example (for one shutter) in the attachment. It's only a test. Looks fine but in longer time will be values over 28, and less than 0 on B007 and B001 & B002

Mae I ask for some help with this issue?

Thanks in advance for Your prompt replay.

Best regards

Gregory

Thank You for Your replay.

Yes, I know. This is the question how (without encoders) find a position of the shutter based only on the time of the closing and/or opening. Maybe some other block (I don't know what kind) or lock the counter between 0-28.

It's a simple shutter. Total time of work is 28 s up and down. If You will give them longer time, end cams stop the motor.

Avaialble for any idea :-)

BR
Gregory

Ixo65 - You are great!

It's exactly what I want. It's no industrial machine, when exact position is important. It's only for visualization purposes. Your solution works fine. I implemented  Your solution into my application, and I will check after a couple of days how they show the position. Seems to be OK.

I try do this in that way, but I don't think about 1 second (in total) impulse to calculate them.

Once more -  Thank You.

BR and have a nice day,

Gregory