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ArjinFerman  Tinfoil Gigachad  1mo ago (text post)   463 thread views

Tinker Tuesday for September 30, 2025

This thread is for anyone working on personal projects to share their progress, and hold themselves somewhat accountable to a group of peers.

Post your project, your progress from last week, and what you hope to accomplish this week.

If you want to be pinged with a reminder asking about your project, let me know, and I'll harass you each week until you cancel the service

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Which one of you can teach me about home automation? Here's my use case:

  • I have a cabin in the country that I would like to preheat in spring and fall with space heaters
  • This means I need a way to remotely see the temperature and switch the heaters on until the temperature reaches 20C
  • I want zero data leaks

What I have learned so far:

  • I need smart plugs for my space heaters, ideally with built-in temperature sensors
  • Home Assistant is the only real option for the management server
  • Zigbee and Z-Wave are the fancy low-power wireless options for smart devices, but for a literal plug they are unnecessary
  • There are two options for smart plug firmware that use WiFi: Tasmota and ESPHome
  • My router/modem is not powerful enough to run Home Assistant

The DIY option is to buy:

  • a small computer to run Home Assistant and Tailscale on
  • a small UPS to protect the PC (my router/modem already has one, but it's too small to be shared)
  • two smart plugs to control two space heaters, ideally with a temp sensor, flashed to run Tasmota or ESPHome

The "happy wife" option is to buy:

  • two Chinese smart plugs, one with a GSM module
  • a SIM card with an IoT phone plan

Am I even moving in the right direction?

This means I need a way to remotely see the temperature and switch the heaters on until the temperature reaches 20C

Do you? I imagine the space heaters have a thermostat that can already do this task with no input from you, don't they?

I get the instinct to want to DIY it to get a feeling that I actually own my shit, I tend to do the same. But if you're not planning to expand this into a bigger system, in the end, if your smart plugs are really just smart "on-off" switches, you're probably overthinking the data leak aspect.

It's not like you're putting cameras there. Yet. Which you probably will eventually.

Do you? I imagine the space heaters have a thermostat that can already do this task with no input from you, don't they?

They do, but I don't want them running during the workweek, only when I'm actually driving there.

Ok, but then all you need is smart plugs with remote activation.

Set the space heater's thermostat to 20C, turn the smart plug off when you leave, turn it on when you head there. You don't need to know the temperature; if it's already hotter than 20C turning on the smart plug won't do anything, if it's colder it will run until it reaches 20C.

Yeah, but you don't strictly need an entire smart home setup for that. The ghetto setup I'd use looks something like that: set the space heater thermostat to whatever number corresponds to 20C, plug them into any Chinese ethernet power strip, connect the power strip to your router.

The rest depends a little on the router/modem you have, but basically all modern prosumer/enterprise routers or just any openWRT box will allow you to just send the power-ON command to the power strip once you've connected from the outside. I'd just use SSH over VPN to trigger a one-line bash script.

If you want to monitor the inside temperature, you could add a cheap Raspi + analog thermometer to the setup, which you can also query over SSH.

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