That One Pumidor Post I Promised Over A Year Ago…

7 thoughts on “That One Pumidor Post I Promised Over A Year Ago…”

  1. Really interesting article. I will watch this project with great interest. Unfortunately, I lack the engineering know-how to replicate this myself and so must be looking to a turnkey solution if I travel down this route. In the meantime, I’ll just keep managing the humidity manually while keeping the temp at room temperatures like I’ve done for the past several years.

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  2. Oh and another question: How are you powering it and how long would something like this, maybe without fans, just the measurement, run off of a battery?

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    1. If you wanted to run a system like this off a battery, you’d need a clever power-management strategy – the power consumption of the Wemos D1 Mini is relatively high.

      Assuming you wanted to keep the wifi for ease of use, I’d suggest setting up a system whereby a low-power-capable controller (say an Arduino Nano or Pro Mini, using the rocketscream Low-Power library) is used to switch power to the Wemos. For example:

      – Nano turns on power to Wemos (either using a DO pin or a relay/transistor)
      – Wemos starts up, initialises, transmits a datum via HTTP, then drives a DO pin high.
      – Nano, monitoring the Wemos’ DO pin with a DI pin, waits for it to drive high, then goes to sleep for an hour (or however long) and repeats the process indefinitely.

      Of course, you could also just use a low-power-capable controller and a wifi shield to begin with, but this would require more work to figure out and get working

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  3. Hey! Nice project, and something that I have had on my to-do list for quite a while as well.

    You can create a layout for your PCB with software such as KiCad, and PCBWay is a very low-cost PCB manufacturing house which I have used in the past and been happy with their work.

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