My Auto Masking - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 13 Old 01-05-2016, 02:04 PM - Thread Starter
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My Auto Masking

Well it has been a long road and a couple of different versions but I am finally I think done with my masking and control system. I think mine is a little different then anyone else's in that my masking will fully close to cover the entire screen when it is not in use, this makes it surprisingly more difficult. The entire thing is ran by a single cable that is controlled by one AC gear motor. All tension on the masking is done by counter weights, so their is not springs or anything to wear out over time and change the tension. Equal pull is exerted on the masking in both directions so they offset each other, this way it does not take a very big motor to move it.


I have manual controls on the screen wall itself that are just mechanical switches, one to open, one to close and one that will kill power to the entire system.


The automation is controlled by a micro control called an Arduino, it is cheap and pretty easy to program. I had never programed one before this and caught on pretty quick. Their are micro switches at each spot the screen stops: Closed, 4:3, 16:9, 1.85, 2.35, 2.40, and Full Open. I though about using some sort of encoder to track the motor position but decided that the switches were more going to be more reliable in the long run as no calibrating or anything has to be done. BUT I think I may play around with adding one as the Adruino is capable of excepting input from one. The Arduino gets a signal from my Harmony remote as to witch position it needs to go to. I also have manual controls on the remote so you can move it to anywhere you want.


This is the motor control with the 3 buttons to run it manually. Their are three relays, one turns the motor one, one puts the motor in reverse, and the other locks out the manual buttons when the Arduino is controlling it. The Arduino simply triggers the correct relays to get the motor to go in the correct direction until the correct micro switch is triggered by the masking.


Link to the Arduino site : https://www.arduino.cc/



Here is a video of it in action




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Last edited by Mopar_Mudder; 11-08-2019 at 09:46 AM.
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post #2 of 13 Old 03-28-2016, 08:35 AM - Thread Starter
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Here is a Sketch Up file showing the design if anyone is interested.

Screen Masking Take 2.zip
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post #3 of 13 Old 03-28-2016, 08:40 AM - Thread Starter
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Here a some pictures of the design:
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Last edited by Mopar_Mudder; 11-08-2019 at 09:31 AM.
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post #4 of 13 Old 02-25-2017, 02:22 PM
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very cool
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post #5 of 13 Old 03-08-2017, 08:57 AM
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This is very impressive. Did you fabricate all of it? Those arduinos are cool. I've used one before. Although the programming still confounds me!
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post #6 of 13 Old 03-17-2017, 04:43 PM
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Looks very impressive :
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post #7 of 13 Old 03-20-2017, 10:44 AM
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That is very impressive! The Arduino is very cool. I am curious where you sourced the components. Specifically I noticed at the very start of your second video that you have a conical shaped cable take-up pulley. Where did you get that? (In my design I had to use multiple layers of tape to try to replicate the conical shape).


I think your design is the best DIY masking setup I've seen. Congrats!
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post #8 of 13 Old 04-13-2018, 03:03 PM
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Quote:
Originally Posted by ScottJ0007 View Post
That is very impressive! The Arduino is very cool. I am curious where you sourced the components. Specifically I noticed at the very start of your second video that you have a conical shaped cable take-up pulley. Where did you get that? (In my design I had to use multiple layers of tape to try to replicate the conical shape).


I think your design is the best DIY masking setup I've seen. Congrats!
It is similar to a vertical lift cable drum from a garage door assembly, but less extreme. I too would like to know the source of some of these components.
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post #9 of 13 Old 04-13-2018, 06:22 PM - Thread Starter
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Sorry I didn't get notices that their were questions on this thread until today. Yes I fabricated everything myself. I make the conical pulley from scratch, took a bit of math to figure out the small and large end to make a pattern. Still working great other then when the power goes out it confuses the Arduino, I think I can fix that just haven't taken time to get into the programming of it. I see some pictures are not working, I will try to fix the links.
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post #10 of 13 Old 11-07-2019, 04:11 PM
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Quote:
Originally Posted by Mopar_Mudder View Post
Sorry I didn't get notices that their were questions on this thread until today. Yes I fabricated everything myself. I make the conical pulley from scratch, took a bit of math to figure out the small and large end to make a pattern. Still working great other then when the power goes out it confuses the Arduino, I think I can fix that just haven't taken time to get into the programming of it. I see some pictures are not working, I will try to fix the links.
Hi, Just found this post while looking for masking system.
Can I get sketch up file? or any detail information would be great help.
Thank you!
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post #11 of 13 Old 11-08-2019, 09:44 AM - Thread Starter
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Originally Posted by umjs78 View Post
Hi, Just found this post while looking for masking system.
Can I get sketch up file? or any detail information would be great help.
Thank you!
PM me your e-mail and I can send you the shetch up file.
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post #12 of 13 Old 11-08-2019, 11:11 AM
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PM me your e-mail and I can send you the shetch up file.
Good to hear from you again! I am also interested in the sketchup file as the old link seems to be invalid. Will send a PM.

Could you provide any more detail on parts you used?

Thanks!
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post #13 of 13 Old 11-08-2019, 11:43 AM - Thread Starter
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Well I wish I would have documented it better and taken more pictures as I did it, but its too late now.

As far as all the parts go I really made most all of them by hand other then the trolley wheels and cable, just lots of fabricating.

I will send the Sketch-Up file to anyone that wants it. All the parts I made we built off from the file so they are all exactly to scale.

If you have any questions on specific parts just let me know and I will try to answer.
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