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  • Nice. I have been meaning to do this with an e-ink device but other distractions keep getting in the way.
    by dofm
  • 25$ to unlock all the features...
    by mmmlinux
  • I'd like to endorse the plug choice :)

    Shellys can be configured to connect to your wifi and are not dependent on any cloud service.

    by nottorp
  • Good idea. I wonder if the iPhone's camera would be able to measure the projected negative and guide exposure time?
    by sailingcode
  • I grew up with two photographer parents that built a house around photographic printing. I was looking through their exposure notes a bit ago and as long as you can get sub second you should be able to get some pretty consistent results.

    They did color, so when printing there was no such thing as a safelite. I can still vividly remember being that "can I help?" age and setting the timers for each color, loading in the paper in complete darkness, firing up the enlarger, and then feeding it to the auto processor. It was certainly an interesting way to grow up.

    by pathartl
  • 25 years ago my dad built me a darkroom timer with a relay and a PIC 16F84A. It only had one button that you used a combination of short and long presses to adjust the time (read on a 7 segment LED display) and trigger the exposure.
    by s0rce
  • I get that red-on-black color scheme is a nod to the red lighting of a dark room, but the contrast is so low I can hardly read the example screenshots.
    by pimlottc
  • Very cool. Is it controlling the plugs via direct Bluetooth connection? Or zigbee via a hub, or wifi (direct or via service)?

    I always assumed, probably incorrectly, that there would be too much jitter in the actual timing so I had built a few prototypes of e.g. an esp8266 controlled relay, where you would give the MCU a duration rather than separate on/off commands. But I guess that was wildly over-optimizing. In your case, how stable is the delay from the app sending a command until the switch operates?

    I'd add voice mode for color printing in total darkness.

    by arnarbi

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