Projector elevator and Arduino controls

(forgive the lack of a busty, I'm writing from the phone)
Author, I meant the motor as the whole mechanism, I know that the electronics built into the actuator are responsible for everything

.:KoSik:. wrote:

cooltygrysek wrote:
The solution would be a sunroof drive


Unfortunately, a spring is used to transfer this drive, not a cable, and it must have a special guide, so it will not work.

What also a colleague writes. The Golf III damper has no springs. I built a 22 '' LCD monitor hidden in the table top on such a drive.

And the projector does not mind that it is "upside down", I always thought that these slots are there to dissipate heat ....

1st wrote:

is "upside down"

So now I look ... If the projector is placed on a shelf, it could be placed as standard - with its feet facing down. It is not screwed to the hanger under the ceiling.

Quote:

So now I look ... If the projector is placed on a shelf, it could be placed as standard - with its feet facing down. It is not screwed to the hanger under the ceiling.

Usually the projector displays at a specific angle, i.e. the bottom line of the screen straight from where it stands, the top line angled upwards ... If you mount it to the ceiling normally and not upside down, the image will not fit on the wall . The bottom of the painting will be at the height of the elevator shelf, and the top will curl up to the ceiling You can tilt it, but then you have to counter the obtained trapezoid.
[edit]
something like this picture ...

It is perfectly logical. I didn't even know about it myself, judging that the image was projected symmetrically with the lens. I didn't even pay attention to it.

nanab wrote:

Low cost and simplicity are always an advantage as we get the same effect.

As colleagues rightly noticed, it is worth simplifying the structure by removing the microcontroller. I agree with that, but it would require the addition of a lower limit switch. At the time of creating the structure, I had no idea how to fit it there.
I was still incorrectly combining with the lower limit switch located in the stationary part of the structure. Maybe someone has an idea how to fit the lower limit switch there, let him post a sketch of the construction for posterity.
With only one limit switch, the simplest (for me) solution was to use a microcontroller that would activate the relay for a specified period of time.
Going beyond the context of the projector elevator itself - I use Arduino anyway to control lighting in my apartment. I would also like to know the condition of the projector from the microcontroller level to be able to control the screen, blinds, lighting, etc.

Euzebiusz23091998 wrote:

Where did a colleague buy such short (and in fact extremely expensive) drawer slides?

Accessories.meble.pl - Probably the only store that offers 15 cm guides with full extension. Rare so expensive.

nanab wrote:

The ties in the form of fuses ... I think they would break last

I accidentally checked it in practice notice that the cable tie is attached to a thin and sharp metal plate that acts as a knife.

nanab wrote:

Manually turning the wiper motor in an emergency - even without the brake, it's hard

I don't understand what the brakes are about, but it depends on the transmission used. In my case, this is not a problem. I will try to upload a movie that looks like "emergency access".

PS: @krisRaba perfectly illustrated the problem of the inverted projector

lukas6873 wrote:

I don't understand what the brakes are about, but it depends on the transmission used

It is a dynamic brake, i.e. a short circuit of the motor terminals. The motor, while still spinning with the central force, generates the magnetic field (and current), short-circuit of the motor circuit results in its faster disappearance of this field and faster rotor stopping.

Erbit wrote:

Maybe it is possible to remove the elevator and install it with panels? That would solve the dust problem.

I think my colleague meant a niche for an elevator, or a shaft or an elevator.

Dust and dust are present everywhere except in sterile laboratories. Whatever a friend does, he will still find it. But that's not what it is about. Knowing the design of projectors (they build worse and worse), dust settles on the matrices and mirrors, causing thermal degradation of their surfaces (matting). It is important to replace the dust filters (if any) and clean the fans and the interior from dust and dirt. Unfortunately, in many projectors it is impossible to clean everything. A better solution would be to add a better dust filter to the fans.

Erbit wrote:

cooltygrysek wrote:
... A better solution would be to add a better dust filter to the fans.


This can result in a reduction in airflow and hence a reduction in cooling.

Not necessarily as long as a good filter is installed. There are many filters, including HEPA filters, which even increase air circulation (greater air flow rate with the same size) while maintaining the filtration class.