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Elmo TRV16 with RPI HD Camera

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  • Elmo TRV16 with RPI HD Camera

    This is no ordinary TRV16 with old technology low rez camera. This unit has been modified with the Raspberry Pi HD camera with 1440x1080 resolution.
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    The RPI with its camera replaces the old camera and reuses the old camera mount so once the
    covers are on you would not see any difference between the old and modified unit.
    The only noticeable difference is the two switches on the top replacing the color adjustment knobs.
    The switches are used to run the HDMI combined video and sound preview and record to the internal micro SD.

    The unit comes equipped with the HDMI cable, AC cord and external USB connector for the USB stick.
    The video can be either saved to the external HDMI recorder, or internal memory and then transferred to the
    USB stick.

    The Unit also has a small wireless keyboard that provides access to full RPI functionality including the
    WiFi access from another computer on the local network.
    The camera full functionality can be controlled through the wireless keyboard or over the WiFi.
    For simple no nonsense record and preview the two switches are included and the preview/record operation can be started
    with just a flick of the switch.

    Video Quality
    The 16mm high quality lens gives extremely sharp videos.
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    The global shutter camera combined with the 5 blade shutter wheel gives flickerless videos with
    beautiful colors.
    https://drive.google.com/file/d/14lk...ew?usp=sharing
    The sound at the beginning is distorted because there was no film lead on this clip to allow for the sound flywheel
    to spin up.

    I started the project with Kim. He originally restored the old projector and got it working properly.
    I fixed one of the transport gears. That was a project in itself. The gear has a nasty crack in it.
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    Clamped the gear and epoxied two disks on each side.
    And this is what the result looked like:

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    Was not sure it this would work, but id DID, Yeah!!!
    Then after that, several weeks of RPI mods, software, testing etc etc.
    Lots of work, but it was tons of fun and very happy with the results.






  • #2
    Definitely the PROPER way to "upgrade" this otherwis excellent telecine projector!

    Comment


    • #3
      Yes there is an Elmo TRV 16mm for sale listed now at

      https://www.ebay.com.au/itm/13477477...Bk9SR-T5npnQYw

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      • #4
        How fast does it take pictures? Or does it take video instead? I'm guessing the latter?

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        • #5
          It runs real time, 24 FPS.

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          • #6
            This is something I'm looking to do to a similar model (TRV-16G). I think I saw you had a 'kit' on sale on ebay, but can't seem to find it. I'm assuming the camera mounts may be slightly different...

            Comment


            • #7
              Hi Dennis. I sold the kit. But I can send you the camera mount bracket so you can check if it will fit.

              Comment


              • #8
                Originally posted by Stan Jelavic View Post
                Hi Dennis. I sold the kit. But I can send you the camera mount bracket so you can check if it will fit.
                That would be fantastic! I work at a museum and if you wanted to 'donate' it you could even count it as a tax deduction

                By any chance was it 3d printed? I have access to and frequently use one, so if you had an STL file it would be even easier...

                Thanks so much!

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                • #9
                  Ii will send you the STL file Dennis.

                  Comment


                  • #10
                    Just noticed something. The main drive motor in this machine seems very different from usual 16-CL ones. Can I have a closer look at it?

                    Comment


                    • #11
                      Here is the motor detail for TRV16. Click image for larger version

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                      • #12
                        Hi Stan, this is remarkable! I found your ebay listing a few months ago, and following your pdf guide on that page recreated the project with an Elmo TRV-16G that I had received from my job's upcycling program. I am just getting it working, and using the RPI have learned how to use the Linux command line to operate the RPI camera. It is very close to being finished, but I wanted to ask if there is anything I should note in the process of connecting the sound bulb to the RPI via USB-to-3.5mm adapter. The optical audio track, recorded with the arecord command line function, is an unrecognizable and very quiet hissing/crackling. I am pretty certain this issue is not related to the RPI/USB connection, since the lsub function recognizes the USB adapter when recording.

                        The 3.5mm cable recording into it is stereo, which may itself be the issue. This records from a series of adapters which records from the pins on the circuit board labeled Audio and Ground. The adapters i used were a PCB mount which converts the Ground wire (orange) and the Audio wire (yellow) to mono 3.5mm male, which I use a 3.5mm barrel connector to join it with the other end of the stereo cable connected to the RPI. If it matters, the Ground wire is terminated at the PCB block port labeled positive and the Audio into the negative. The sound bulb could also be broken which would be tough since that is one of the hardest parts to replace. Any advice or corrections would be much appreciated!

                        Click image for larger version

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                        • #13
                          Hi Jess,
                          Maybe a wiring issue. Unplug the audio card cable from the mono - stereo adapter and using a metal screwdriver touch the center or central ring on the cable connector you should have a loud hum. You can also touch the screw driver with a finger an this should produce a louder hum. If not then you probably did not program the RPI correctly. Also check the HDMI sound programming on your RPI.
                          Stan

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                          • #14
                            Stan, What lens did you use? I think it was a C mount but don't know the focal length. - Bill

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                            • #15
                              I use two type of lenses.
                              RPI 16mm lens C mount.
                              https://www.amazon.com/Arducam-C-Mou...dp/B088H936PV/
                              Or Aico 16mm Chinese brand. M12mount
                              https://aico-lens.com/product/16mm-f...ns-ach1622mac/

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