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    Using Griffin Powermate as a scratch controller

    Interfacing
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    • Fred
      Fred last edited by

      You can use arduino and a rotary encoder if you want a clean interface. I also have a novation nocturn, this has rotary encoders that can be reconfigured as continuous.

      http://www.fredrodrigues.net/
      https://github.com/fred-dev
      OSX 13.6.4 (22G513) MBP 2019 16" 2.3 GHz 8-Core i9, Radeon Pro 5500M 8 GB, 32g RAM
      Windows 10 7700K, GTX 1080ti, 32g RAM, 2tb raided SSD

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      • Skulpture
        Skulpture Izzy Guru last edited by

        I have a power-mate and it's pretty cool - but a bit awkward to interpret the MIDI messages. I need to look at it again to see what is possible.

        Graham Thorne | www.grahamthorne.co.uk
        RIG 1: Custom-built PC: Windows 11. Ryzen 7 7700X, RTX3080, 32G DDR5 RAM. 2 x m.2.
        RIG 2: Laptop Dell G15: Windows 11, Intel i9 12th Gen. RTX3070ti, 16G RAM (DDR5), 2 x NVME M.2 SSD.
        RIG 3: Apple Laptop: rMBP i7, 8gig RAM 256 SSD, HD, OS X 10.12.12

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        • G
          gavspav Beta Silver last edited by

          I used a DJ Hero Controller + Arduino. Cheap and cheerful.

          http://www.digitalfunfair.co.uk I'm using M1 MBP 14" mostly but sometimes use older Mac & Windows machines.

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          • m_theater
            m_theater last edited by

            hi marc,

            i would try to convert the sound into a movie and fiddle around with the speed setting
            this shall give you a much smoother playback then selecting the position
            interfacing the devices is the second step
            i could imagine a counter in a short timer
            count modifications(rotation of your knob) modify this to speed
            reset speed after xxx seconds
            good luck
            best clemens

            avk4.net

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            • C
              Colonel_Moutarde last edited by

              Thanks for all your suggestions. The thing will be buried deep into a museum exhibit, so no need to have a nice and neat look. The speed control of a movie seems to be the best option for smooth playback. I haven't set any hardware yet to make some tests, but I will very soon. As the installation must last about 6 month unmanned, it has to be as simple and sturdy as possible, with no manual config to do on daily startup.

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              • C
                Colonel_Moutarde last edited by

                Just thought: Using a DC motor to generate voltage proportional to the rotation speed, and turn it to data to be read by Izzy. I just need something to catch direction of rotation, or offset the output voltage with a bunch of transistors.

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                • Skulpture
                  Skulpture Izzy Guru last edited by

                  Had a little test... c42e6f-screen-shot-2014-07-22-at-12.32.57.png edad00-power-mate.izz

                  Graham Thorne | www.grahamthorne.co.uk
                  RIG 1: Custom-built PC: Windows 11. Ryzen 7 7700X, RTX3080, 32G DDR5 RAM. 2 x m.2.
                  RIG 2: Laptop Dell G15: Windows 11, Intel i9 12th Gen. RTX3070ti, 16G RAM (DDR5), 2 x NVME M.2 SSD.
                  RIG 3: Apple Laptop: rMBP i7, 8gig RAM 256 SSD, HD, OS X 10.12.12

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                  • eight
                    eight last edited by

                    https://www.youtube.com/watch?v=HQuLZHsGZdI

                    --8

                    Analysis: http://post.scriptum.ru | Synthesis: http://onewaytheater.us
                    Twitter: https://twitter.com/eight_io | Flickr: http://www.flickr.com/photos/eight_io/
                    Github: https://github.com/eighteight | MulchCam: https//mulchcam.com
                    MulchTune: https://itunes.apple.com/us/app/mulch-tune/id1070973465 | Augmented Theatre: https://augmentedtheatre.com

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                    • m_theater
                      m_theater last edited by

                      sculptures test motivated me to try how the speed approach could sound like

                      so here it is
                      without the power mate aded two buttons for left and right turn
                      and a toogle to switch between the position and speed way

                      b0f295-power-mate_2.izz

                      avk4.net

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                      • C
                        Colonel_Moutarde last edited by

                        I think I will forget the Powermate approach, mainly for mechanical reasons. I need a really sturdy and reliable setup.

                        I've made some tests with an Arduino sending me MIDI pitch messages according to the speed of a DC motor and two different velocity according to the direction (actually, I simulate it with a pot and a toggle switch). Hardware side is fine and everything is OK when playing forward, from 0 to around 300% which is the max speed I want to achieve. But backward play out has hiccups. So I created a backward file which I sync to the other file and switch from one to the other according to the direction. But sending direct position makes my ears bleed ! 
                        So I've added a lookup when direction is changed and feed the actual position to the muted player only at this time. 
                        It works fine but as I am quite a rookie with Izzy, advises for better programming are welcome !

                        b21488-ko-scratch.izz

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