1. I'm looking to use a 21.3" LCD monitor like the HP LP2065 or the Samsung 214t (5x4 ratio), do you think that the servo that you used would have enough torque to turn that? If not, what would you suggest? Would you recommend stops?
The servo I used was able to turn my 20" monitor quite easily, so I suspect it should handle a 21" LCD ok. Just to be clear, this was the Giant Scale HS-805BB I used with the LP2065, not the smaller HS-645MG I used with the laptop LCD in my final bar top design. Not sure the smaller servo would have enough torque.
I would recommend stops. If you've read all my posts, you know I started with the LP2065 on a modified monitor stand and had it rotating with stops. I then subsequently moved to using a laptop LCD with a smaller servo for an overall smaller bar top cabinet. In order to keep the profile small, I did not use stops with the laptop LCD. In retrospect I wish I had. As it is, I can get my rotation parameters setup so that the monitor lands perfectly in the landscape and portrait orientations, and it will continue to work fine for days, or even weeks, and then suddenly it will start to over or under shoot slightly. It's always fairly close, but off enough to notice. I think small variances in the characteristics of the materials due to ambient temperature and humidity fluxuations, normal wear, etc. just throw it off over time...and since there's no hard stop, it ends up being a bit off. I can always tweak the rotation parameters to get it back on track, but I finally just added a small finger hole in the side of the cabinet so that I can just reach in and manually make minor adjustments to get it square. I think using stops and magnets like I used in my first setup would be enough to overcome the minor variations and keep things square after an orientation shift.
2. Do you think the bearing system you used would support one of these monitors?
Again, the monitor you're proposing is only slightly larger than the one I used, so you're probably fine as long as it isn't significantly heavier for some reason.
3.Have you posted the custom app you created to drive the rotation? If not, is there any way I could get it from you?
PM me when you get to the point where you think you're ready to start driving the servo and I can provide the app. You will, of course, need to use the same servo driver that I used. See my itemized post above for details.
4. Where are your speakers mounted? What speakers are you using?
I had planned room for a small set of speakers behind the marquee, however, the laptops built-in speakers actually turned out to be quite sufficient in most cases...and when I want a bit more punch on the audio, I just use an external Bluetooth speaker.
Hope this helps.