… though I can’t find said promise; maybe I felt guilty and retconned it out of existence.
I’d like to say I’ve been busy working on pumidor stuff, but the truth is more like “I’ve been busy with school and started giving a shit about working on my pumidor again about two months ago”.
This is the tentative result of my shits-given. If any of my physics professors are watching, axis labels are incoming, I promise (along with a bunch of other improvements/features). It’s come a long way from my first efforts (as has my hoarding, apparently).
So what’s the deal?
A $5 wifi-capable computer, a couple of $3 sensors that are grossly overspecced for the application, and some basic electronics project supplies gets you a control system that will monitor your pu and send details to The Cloud(tm). Another ten bucks’ worth of fans, heat-pads and some transistors to switch them and you have a full-fledged environment controller. Maybe a DC-DC converter if you want to run the controller off the same 12 supply as the heat/fan.
Building such a controller requires basic familiarity with Arduino controllers, but is relatively simple.
I’ll write up a wiring diagram the first time anyone asks for one. Asked and received!
So what does it do? Broadly-speaking it keeps your tea within whatever range of temperature and humidity you desire (a setpoint +/- whatever hysteresis you set). If you have multiple sensors it attempts to control the average value, but allows you to set hard limits (for example, mine attempts to control to an average of 68%RH, but the humidifier will switch off if any sensor reads above 73%RH – as you can see there’s a large delta between upper and lower sensor for my pumidor, which is imperfectly-sealed). If it fails to achieve the desired parameters for a given length of time, it yells at you.
As for the website, I still need to figure out what I want from it and if anyone else is likely to ever use it, but eventually it should provide all the charting gimmickry one could want along with the ability to change storage parameters remotely and export data in a meaningful fashion.
If anyone dabbles with PCB-fabrication and has any hot tips on how to design/fab them inexpensively, I’d be very interested to hear from you – the only thing stopping me from making these available at a halfway-reasonable price is the fact that soldering trace-wires is a pain.