[IvyMike]

I've been toying with a variant of this project for my Honeywell home air filters. I have one in all my "big" rooms, and I like to keep them running at a low speed most of the day.

But I also have time-of-day energy pricing, and it would be nice to automatically turn off (or at least slow) my air filters during the 5pm-8pm window. This project inspires me to at least look into the feasibility of adding that functionality myself.

[NegativeLatency]

Depending on your air filter you might be able to just use a smart plug, I went down a similar route this summer before realizing that mine would remember their power state and settings when powered off.

So now I just have them plugged into a few smart plugs with automations in homeassistant

[reaperducer]

Why not just use a dumb timer plug from a hardware store?

Ten bucks, and completely hacker-proof: https://www.acehardware.com/departments/lighting-and-electri...

$16 if you need a remote control: https://www.acehardware.com/departments/lighting-and-electri...

Or $17 if you want to get all digital and fancy: https://www.acehardware.com/p/3001323

[NegativeLatency]

Sure those work, I've tried them before, but I find them more fiddly and less fun to program than homeassistant.

Also I can easily turn them on or off from my phone which is nice if I'm feeling lazy.

[IvyMike]

I would need a device with a physical switch rather than a touch control. Sadly many devices, mine included, have "power was cycled = device is off" logic.

[sksksk]

You might have luck with these... https://uk.switch-bot.com/products/switchbot-bot

[NegativeLatency]

curiously mine are digital momentary switches, they just happen to store their state in some kind of nonvolatile storage

[XorNot]

This is what I do with my dehumidifiers.

It's been working so well I was actually surprised one night when the dehumidifier in the bedroom turned itself on from the automation (which I have set to do after dark if humidity is higher then 70%).

It had been within tolerance for ages and I just hadn't had to even think about it.

[tylergetsay]

You should, it is very DIYable! I did it and reverse engineered it myself a while back. You dont need to make a custom circuit board if you are fine with losing the touch controls

[alright2565]

https://github.com/flaviut/Honeywell-HPAx00-ESPHome

[IvyMike]

Holy shit, perfect!

[randyrand]

Why not this? 24-hour programmable timer https://www.amazon.com/dp/B0D7ZS6PGK