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Show HN: I turned my iPhone and a $20 smart plug into an f-stop timer

peterszentkiralyi.eu48 points7 comments
Screenshot of Show HN: I turned my iPhone and a $20 smart plug into an f-stop timer

Darkplug is an iPhone/iPad darkroom timer that controls an enlarger through a local smart plug, designed specifically for film photographers and darkroom printers. It replicates classic darkroom timing while adding guided workflows: straight prints with optional 4‑second count‑in, test strips in seconds or f‑stop increments, a unique grid system for planning dodge-and-burn sequences, split‑grade (two‑channel) timing, and a paper development timer. The interface uses red-on-black visuals chosen and tested to avoid fogging photo paper, with large legible controls for low‑light use. An in‑app one‑time purchase called Darkplug+ unlocks advanced features (F‑stop control, guided test strips, dodge & burn planning, split grade, and saved plan codes), with no subscription required.

Setup runs entirely on the local network: plug the enlarger into a compatible Shelly smart plug, note the plug’s local IP, ensure the iPhone/iPad and plug share the same Wi‑Fi, enter the IP in Darkplug, and connect. Compatible hardware includes several Shelly models (Plus Plug S Gen2, Plug S Gen3, Plug M Gen3, Outdoor Plug S Gen3, and the US Plug Gen4). Darkplug is available on the App Store, developed by Péter Szentkirályi, with support via email and published privacy and terms information.

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