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Thread: DIY Temperature Compensation Metronome

  1. #11

    Join Date
    Jun 2018
    Posts
    5

    Re: DIY Temperature Compensation Metronome

    [QUOTE=dajaab;1450321]In box with a foot switch, ready to use !
    I added one switch to choose between Real Time or C

    You do not need another switch. By default if neither the film nor the paper resistors pull down with the switch it defaults to real time. So, I use a single pole double throw switch with Center off center off meaning that neither is pulled down and the timer goes to default real time.

  2. #12

    Join Date
    Jun 2018
    Posts
    5

    Re: DIY Temperature Compensation Metronome

    Very nice job on packaging, by the way. I would love to see a close-up of the exterior at the interior of the box as you mounted things

  3. #13

    Join Date
    Jun 2017
    Location
    Oceanside, California
    Posts
    27

    Re: DIY Temperature Compensation Metronome

    thanks
    I had some simple pole spdt in stock, so I used one for choose Film or paper and the second between the first switch common wire and ground.
    as soon as I open it I take pictures

  4. #14

    Join Date
    Jun 2018
    Posts
    4

    Re: DIY Temperature Compensation Metronome

    1 and 5 are also my question. Ty

  5. #15

    Re: DIY Temperature Compensation Metronome

    Alan Ross uses self-compensating timers in his home darkroom, for what it's worth. If it's good enough for him, it'd more than exceed my own feeble skills. $0.02

  6. #16

    Join Date
    Jun 2017
    Location
    Oceanside, California
    Posts
    27

    Re: DIY Temperature Compensation Metronome

    CONSISTENCY IS THE SECRET

    I am not better with this tool but my results are constant so I can improve my work
    I printed some pictures this afternoon, when I started my developer was at 76. I used my cell fan because it was hot in my darkroom, 30 minutes later my developer was at 72!

    CONSISTENCY IS THE SECRET !
    http://www.jbhphoto.com/blog/2013/03...is-the-secret/

  7. #17

    Join Date
    Jun 2018
    Posts
    5

    Re: DIY Temperature Compensation Metronome

    For those of you building your own Compensating Development Timers,
    I've just released Version 1.01 of the code at the usual place:

    https://gitbucket.tundraware.com/tun...e/Version-1.01

    This is mostly a maintenance and code cleanup release and has no new
    features. I do recommend upgrading. Let me know if you find
    any problems.

  8. #18

    Join Date
    Jun 2018
    Posts
    5

    Re: DIY Temperature Compensation Metronome

    Version 1.02 of the devtimer has been released:

    https://gitbucket.tundraware.com/tundra/devtimer

    - This release expands the range of compensated time for both film and
    paper to a range of 55F-85F.

    - This release add audible warning when you attempt to do compensated
    timing for film or paper and the temperature is not in that range.

  9. #19

    Join Date
    Jun 2017
    Location
    Oceanside, California
    Posts
    27

    Re: DIY Temperature Compensation Metronome

    Thanks Tim to continue to improve this clever and useful timer !

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