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Projector elevator and Arduino controls

lukas6873 18972 41
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  • Projector elevator and Arduino controls

    Hello!

    During the renovation of the living room, I came up with the idea to hide the projector and screen for the projector in the suspended ceiling (or more precisely in the decorative band under the LED lighting). One button activating the projector was supposed to turn a seemingly ordinary living room into a cinema room ...

    The design is based on 15cm drawer guides with full extension. The guides must be mounted parallel to each other in all planes. The structure of profiles for GK frames does not facilitate their calibration. I think it would be easier with a wooden structure.

    Projector elevator and Arduino controls

    The motor rotates a threaded rod on which two lines are wound on the left and right side. I secured the place where the lines are wound with reinforced tape. The cables run through pulleys and are then attached to the moving part of the lift with cable ties. You can easily adjust the left-right tilt with the bands. In addition, they are the weakest elements, so if the lines are pulled in further than expected, the bands will break without damaging the structure.

    Projector elevator and Arduino controls

    The manual control of the elevator is carried out on the car window switch directly on the engine circuit. Thanks to this, in the event of problems with automation, it is possible to raise or lower the lift manually. The upper limit switch in position (NC) closes the motor circuit when the elevator has not reached the upper position. Otherwise, the circuit is open and the motor cannot run in that direction. The limit switch is moved by a piece of profiled plywood with which you can adjust the upper position of the lift. The lower position of the lift is always the same - all guides are fully extended and slack. As a result, the projector is always in the same position when it is turned on.

    Projector elevator and Arduino controls Projector elevator and Arduino controls

    Automatic control is carried out on two relays controlled from the microcontroller. When the projector is started, voltage is applied to the 12V trigger output. After breaking with resistors to ~ 5V it goes to Arduino. The signal from the limit switch, when the elevator has not reached the upper position (NO), is sent to the microcontroller (short circuit to ground). When the projector's status changes, one or the other relay is activated for a specified period of time. If for some reason the Arduino starts up, when the elevator has not reached the top position and the projector is turned on, the elevator will not be lowered. Arduino also controls the projection screen.

    Projector elevator and Arduino controls Projector elevator and Arduino controls Projector elevator and Arduino controls

    The elevator does not cause any problems so far. I also plan to add a 12V 2A fuse, which in theory should burn out when the engine is too heavily loaded. Optionally, you could add a lower limit switch somewhere on the moving element of the elevator.





    Estimate:

    PLN 160.98
    		drawer slides, two pairs, 15cm, full height
    PLN 30.00
    		plywood, UD30 profile, fleas, threaded rod, rope, pulleys, screws, nuts, washers (approximate amount)
    PLN 25.65
    		power supply with a power reserve of 80W 12V DC 6.67A
    PLN 29.00
    		Hyundai Getz front wiper motor (engine without additional gear causing the axis to move back and forth)
    PLN 10.00
    		universal switch for car windows
    PLN 1.70
    		limit switch
    PLN 36.90
    		arduino mega (you can use UNO for half the price)
    PLN 9.00
    		module of 2 relays 5V
    PLN 2.90
    		universal plate
    PLN 5.00
    		transistors, resistors, pins, wires (approximate amount)
    PLN 47.53
    		transportation costs
    PLN 358.66
    		sum
    Attachments:

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    About Author
    lukas6873
    Level 9  
    Offline 
    lukas6873 wrote 21 posts with rating 33. Been with us since 2012 year.
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  • #2 17441108
    szczodros
    Level 19  
    As a motor, you could also use one from electric windows, for example, such Oplowski, as I noticed (Tigra, Vectra B), learns extreme positions, so it turns itself off at the moment of extreme positions (it teaches because in the case of stopping before the end of an obstacle, e.g. opens the window with your hand), you also have then the gear ratio is ready
  • #3 17441126
    kacpo1
    Level 33  
    Interesting project. There is only one thing that interests me ... What does it look like with the cables connected to the projector? Do they get caught on the backplate when lowering the projector?
  • #4 17441160
    Slawek K.
    Level 35  
    Nice design, everything works as it should and that was it ;)

    Greetings
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  • #5 17441200
    lukas6873
    Level 9  
    Thank you for the kind words.

    szczodros wrote:
    As a motor, you could also use one for electric windows (...)

    I considered this option, but I had no idea how to fit it into a 15 cm high ceiling. From the drives, an electric actuator (gate drive) could still be checked.

    kacpo1 wrote:
    What does it look like with the cables connected to the projector? Do they get caught on the backplate when lowering the projector?

    A bit on the patent, I attached all the cables to one of the projector's feet ;)

    Projector elevator and Arduino controls Projector elevator and Arduino controls
  • #6 17442447
    adversus
    Level 32  
    The question is, do you have an emergency patent for opening when the engine is damaged? I am asking because I had such a case with a client and it was terrible to get to fix it.
  • #7 17442538
    Ture11
    Level 39  
    lukas6873 wrote:
    36.90 PLN mega arduino (you can use UNO half the price)

    Arduino boards (clones) have one drawback ... Built-in AMS1117-5.0 stabilizer. When the power goes from Vin (eg 12 V), it is enough to short +5 V with GND on such a board for a fraction of a second for the stabilizer to explode - at the same time giving the full voltage of the DC power supply (12 V) to +5 V. 100% repeatability.

    The design is very nice, but to be honest, I would be afraid to connect the wires to the microcontroller without any optoisolation - a few surges from the light switch or nearby lightning shots - and the microcontroller is hanging. I have a 12 V LED lighting control project on the table, the connected cables are maybe 6 meters in total - they catch everything that happens, and the effects are interesting - and this is the microcontroller suspended, and it works in a slowdown (seriously - if someone told me, that an ordinary ATmega8 can run in "SlowMotion" (until reset) after the usual overvoltage induction in the sensor cable - I wouldn't believe it - but still!).

    Is Watchdog enabled in the Arduino program code?
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  • #8 17442846
    prosiak_wej
    Level 39  
    Ture11 wrote:
    stabilizer AMS1117-3.3V
    Ture11 wrote:
    the stabilizer exploded - giving the full voltage of the DC power supply (12 V) at the same time to +5 V


    How does the 3.3V stabilizer generate 5V?

    Back to the topic:
    Wiper motors are quite a good source of mechanical energy. They are efficient, ridiculously cheap, have different gears ... At my friend's, the solution is so simple that it's brilliant :)
  • #9 17442930
    adi84_84
    Level 14  
    Isn't it better to do it e.g. on esp8266 and write a simple application for the phone?
  • #10 17443051
    prosiak_wej
    Level 39  
    My guess is that you offer control over the phone from the level of the app? From what I can see, the author starts the elevator with the projector, when it is turned on it automatically exits. In my opinion, the solution is simpler, although Arduino is a bit exaggerated here :)
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  • #11 17443317
    Ture11
    Level 39  
    prosiak_wej wrote:
    Ture11 wrote:
    stabilizer AMS1117-3.3V
    Ture11 wrote:
    the stabilizer exploded - giving the full voltage of the DC power supply (12 V) at the same time to +5 V

    How does the 3.3V stabilizer generate 5V?


    Oh, and a colleague caught me on a routine :D Of course, it was about AMS1117-5.0 :D
  • #12 17444583
    cooltygrysek
    Conditionally unlocked  
    Hello. A super useful project, but I have one caveat. Namely, not a very good choice of the drive because, as the colleague mentioned above, in the event of a drive failure, getting to the projector involves cutting the plates. The solution would be a sunroof drive because most of such drives have an emergency manual drive using an Allen key and an additional plus that they immediately have a drum with a rope.
    This screen with a drive a colleague bought or a DIY built-on? And what about dust on the projector ceiling? As for the cables, you can always buy the so-called spiro cables or make them yourself.
  • #13 17444739
    lukas6873
    Level 9  
    Ture11 wrote:
    Arduino boards (clones) have one drawback ... Built-in AMS1117-5.0 stabilizer.

    Earlier there was the original, but I lost the stabilizer and UART, eventually it will probably return there. Thank you for your valuable advice, I will observe the action and, if necessary, think about optoisolation. I will also read about Watchdog, because at the moment I have no idea what we're talking about.

    adi84_84 wrote:
    Isn't it better to do it e.g. on esp8266 and write a simple application for the phone?

    The main thing was to control turning the projector on and off, of course it can be done on ESP8232, but Arduino also controls the apartment lighting, and for this I needed many pins.

    adversus wrote:
    The question is, do you have an emergency patent for opening when the engine is damaged?

    cooltygrysek wrote:
    As a colleague mentioned above, in the event of a drive failure, getting into the projector involves cutting the plates.

    The front of the GK headband is removable. In one photo with exposed electronics there is no such front. The motor with the shaft is at the front, so there is no problem with turning it by hand. Replacing the motor is also an option.

    cooltygrysek wrote:
    This screen with a drive a colleague bought or a DIY built-on? And what about dust on the projector ceiling?

    The screen was bought. In theory, dust shouldn't be a problem as there's no air movement in the ceiling. The projector extends immediately after it is turned on, and only retracts after it has cooled down, when the lamp cooling fan is no longer working. Hence the choice of 12V power supplies with passive cooling.
  • #14 17446094
    cooltygrysek
    Conditionally unlocked  
    lukas6873 wrote:
    In theory, dust shouldn't be a problem as there's no air movement in the ceiling.


    A colleague will wait a while and the dust will be found and the circulation is always convective due to the temperature differences between the suspended ceiling and the ceiling.
  • #15 17446151
    kozak 22
    Level 13  
    What are the pcb mounts with relays on the rail?
  • #16 17446469
    lukas6873
    Level 9  
    kozak 22 wrote:
    What are the pcb mounts with relays on the rail?

    WM-35, found at local electrical wholesaler + smaller screw and some hot glue.
  • #17 17453496
    Krzysztof Kamienski
    Level 43  
    lukas6873 wrote:
    Arduino control

    Nice idea - nightmare execution. In addition, a microcontroller in this design is needed like a watch fountain. Instead of a twine winding motor, it was possible to use a small trapezoidal screw straight from the CNC in the scissor lift system.
    szczodros wrote:
    As a motor, you could also use one from electric windows, for example, such Oplowski, as I noticed (Tigra, Vectra B), learns extreme positions, so it turns itself off at the moment of extreme positions (it teaches because in the case of stopping before the end of an obstacle, e.g. opens the window with your hand), you also have then the gear ratio is ready
    It is not the engine that "learns", but the window controller :D
    lukas6873 wrote:
    From the drives, an electric actuator (gate drive) could still be checked.
    Possibly a one-ton winch, :| are you not exaggerating my friend?
    Finally, for the sake of professionalism, I would like to add that "caterpillars" for cables leading to the moving parts of machines cost pennies.
  • #18 17456994
    cooltygrysek
    Conditionally unlocked  
    Krzysztof Kamienski wrote:
    Nice idea - nightmare execution.


    Maybe a colleague should not overdo it, the DIY department, not the factory. After all, everyone plows as much as possible. Factory constructions often turn out to be worse.

    Krzysztof Kamienski wrote:
    Instead of a twine winding motor, it was possible to use a small trapezoidal screw straight from the CNC in the scissor lift system.


    Yes, you can even use a car jack and even a hydraulic jack, but the question is why? Because it is not known if such a scissor lift would fit? It is simple, although these strings do not fit me a bit either. I would already do on the links. However, a colleague is right about the caterpillar cable guides and I would agree here because the cables in such guides do not break quickly.
  • #19 17458589
    Euzebiusz23091998
    Level 15  
    Where did a colleague buy such short (and in fact extremely expensive) drawer slides?
  • #20 17460385
    nanab
    Level 27  
    In my opinion, it is a strong exaggeration to squeeze such an expensive and powerful computer into something like this, as well (or actually better, because more resistant to failure and interference) it would work based on two switches, two relays, two diodes and a transistor (optional, if the projector's output will not pull two relays).
    Also, the wiper motor is exaggerated here if the projector weighs less than 40 kg, but I understand that it was at hand for free.
    The ties in the form of fuses ... I think they would break last :D It takes a lot of strength to break it off.
    Manually rotating the wiper motor in an emergency situation - even without a brake, hard, and with shorted leads you need about 10Nm to turn it at least slowly.
  • #21 17461363
    cooltygrysek
    Conditionally unlocked  
    nanab wrote:
    The ties in the form of fuses ... I think they would break last :D It takes a lot of strength to break it off.


    A colleague has probably not heard about the aging of the material and these are not resistant to many factors. In the long run, I have limited confidence in tights.

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


    Unless at all or if the worm gear rack does not break or lose teeth :-) Much depends on the angle of the worm gear.
  • #22 17461479
    nanab
    Level 27  
    Neither high temperature, UV, nor aggressive chemicals will age so quickly :D
  • #23 17462915
    .:KoSik:.
    Level 18  
    nanab wrote:
    In my opinion, it is a strong exaggeration to squeeze such an expensive and powerful computer into something like this, as well (or actually better, because more resistant to failure and interference) it would work based on two switches, two relays, two diodes and a transistor (optional, if the projector's output will not pull two relays).

    Maybe you always dump it and put the projector on the table ... but it's a DIY department, I guess? Unfortunately, with such analog solutions it is difficult to control the remote control or bluetooth :P

    Ture11 wrote:
    I would be afraid to connect the wires to the microcontroller without any optoisolation

    I don't really understand ... What cables do you mean?

    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.


    In my opinion, in this case it would be best to use some kind of gear release.
    A very nice design. Aesthetically made and certainly gives a lot of fun. Keep it up. greetings :D
  • #24 17463613
    nanab
    Level 27  
    .:KoSik:. wrote:

    Maybe you always dump it and put the projector on the table ... but it's a DIY department, I guess? Unfortunately, with such analog solutions it is difficult to control the remote control or bluetooth

    When placed on a table, the projector does not extend from the ceiling. There is no remote control or bt here either, so the functionality without a computer would be identical.
  • #25 17463646
    Slawek K.
    Level 35  
    What computer are you writing about? :D after all, it's a regular arduino for a few dollars ;) paradoxically, it will be cheaper than the analog system mentioned above, and more simply ;)

    Everyone has their own taste and preferences, so imposing them as the best and only right solution is pointless. How many heads, so many ideas and everyone can do in their own way, but apart from a colleague of the author of the thread, none of the critics showed his solution, because, as I guess, he has never built such an elevator ;)

    Greetings
  • #26 17463719
    nanab
    Level 27  
    rs6000 wrote:
    What computer are you writing about? after all, it is an ordinary arduino for a few $, paradoxically, it will be cheaper than the analog system mentioned above, and more simply

    And what is arduino on the board, what is the program written for, not a computer? :D And how would adruino + the rest of the device be cheaper and easier than the rest of the device? Two relays, limit switches, two diodes - everything is used, there is only a transistor and a resistor with a total value of PLN 0.15 and only if the projector's output does not pull the relays, as it has the capacity of these several hundred mA, it does not even need to be.
    Something like this should be enough (I don't have an eagle on hand, so I scribbled in paint):
    Projector elevator and Arduino controls
  • #27 17463826
    Slawek K.
    Level 35  
    But I guess you haven't read my post, my friend knows how to program, he wrote a simple code, he wanted to give arduino this, is there a problem with that? ;) then why do you prove the superiority of your solution? Or maybe my colleague was not talking about low cost because it is not always the most important thing? ;)
    So approach it ;)

    Greetings
  • #28 17463867
    nanab
    Level 27  
    I do not defend, but I state that the same functionality and greater reliability can be achieved in a much simpler way :)
    Low cost and simplicity are always an advantage as we get the same effect.
  • #29 17463887
    .:KoSik:.
    Level 18  
    In my house there are more microprocessors than relays and limit switches, so if you take into account the unit cost, it would definitely be cheaper for me to do such a project on some uc ;)

    A decent relay can cost a lot more than uc + mosfet, and if we secure the system properly, it will work just as reliably. Additionally, the expansion will not be a problem and will generate lower costs.

    We can think here for hours, and it is still about scientific values and having fun, and not producing a device for mass production where every penny counts
  • #30 17463906
    nanab
    Level 27  
    .:KoSik:. wrote:
    In my house there are more microprocessors than relays and limit switches, so if you take into account the unit cost, it would definitely be cheaper for me to do such a project on some uc

    Only (as I have been repeating for a few posts) the computer does not exclude relays and limit switches :D They are still used in this design. Only in my diagram the limit switch should be slightly larger (50gr more expensive) by using a much too large motor, but you can move them to the relays (adding one transistor and resistor) and the problem disappears. Reliability with avr will always be lower, and it is not without reason that they are not used in e.g. military equipment.
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Topic summary

The discussion revolves around the design and implementation of a projector elevator controlled by Arduino, aimed at integrating a projector and screen into a suspended ceiling for a home cinema experience. The user describes using 15cm drawer guides for the mechanism, with a motor rotating a threaded rod to lift the projector. Various suggestions are made regarding motor choices, including using electric window motors and wiper motors, as well as concerns about cable management and potential emergency access if the motor fails. The conversation also touches on the reliability of using Arduino versus simpler relay-based systems, with participants debating the merits of each approach. Additionally, considerations for dust management and cooling for the projector are discussed, emphasizing the importance of maintaining airflow and using effective filters.
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