this post was submitted on 20 Apr 2026
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Yeah home built and programmed smart devices are the way to go. I'm addicted to the rush of making dumb appliances automated.
The smartphone controlled aircon for $150 extra? Slap a $4 Esp in that. $400 to get sleek control of your central heating? $4 Esp. Turn on the ice maker on the commute home? You guessed it, $4 Esp.
Where the hell are you getting 4 ESP. And no its not good for everything. I buy zwave switches and water sensors.
Not the previous poster.
A simple ESP8266 module from AliExpress is less than $4 (an ESP12F module - which is the FCC certified one with most I/O ports available - is $2), can be programmed with Arduino, has WiFi and that is more than enough for wireless home automation peripherals that are not supposed to do lots of processing (it will still easilly fit a REST interface for automated control and even a web interface for user control alongside it).
That said, in order to power it unless you can somehow draw 3.3v from the device it's attached to, you actually need more parts and that'll add up to more than $4 unless you're doing it with batteries (and design and assemble your own voltage regulator circuit which is not that hard and is cheap, or maybe get a slightly more expensive ESP module that comes with voltage regulation) - this works fine if your device sleeps most of the time and just wakes up once in a while to check some data from a server holding instructions for it. For an always one device, best IMHO to use a 3.3V wall power adaptor, which will cost at least $6 from AliExpress.
The power considerations apply exactly the same for ESP32s.
$2 is a normal price on Aliexpress for an Esp32 C3 super mini, $4 is almost expensive
I wanted to do ESPify my fume hood for some time now, but I don't really know where to start. Do you have some website/howto for me to get started? To be honest, I don't really care about smarting up the actual extraction part. I just want to turn on and off the lights without finding the non-illuminated touch button on the black glass. Who designs crap like that?
You need electrical experience, I wouldn't recommend anyone to work with high voltages unless they knew what they were doing. The method depends on the device, every one is different. For the aircon unit the esp is an internal remote, so I spent time decoding that model's IR codes and building a platform for reliable control via home assistant. I have fans around the house that use mains voltage motors with 3 speeds, those got an interlocked 3 channel relay board. The ice maker used digital logic, so the esp sits between the control board and the rest and intercepts button presses to keep track of state and the injects its own commands for remote control(not my work). If you are lucky there will be a guide on the internet you can apply to your specific device, otherwise you'll have to work the project out solo from smaller guides.