I've got an antique lamp that needs a new switch knob, but then scope-creep happened and now I want to "smartify" it. I started off thinking that, since it has a metal body, I'd install a capacitive touch switch, but now it's escalated to wanting to put an ESP8266 or ESP32 in it to handle the capacitive sensing, Home Assistant connectivity/control, and maybe even switching to some kind of low-voltage RGBW LED instead of a 120VAC Edison-base bulb (especially since I suspect I'd need some kind of antenna sticking out the top, since the metal lamp body would presumably otherwise block the ESP32's signal).
The lamp, BTW:
(Apparently it's a Genie lamp by Laurel Lamp Company, in case anybody cares. Also, the lamp shown is the same model, but it's not my picture.)
I'm aware that the "easy" way would probably be to just screw a smart light bulb into the socket and wiring I already have, but (a) I'm picky about both avoiding "clouds" and using FOSS firmware, and I don't feel like sorting through the junk on Amazon to figure out which ones can be flashed with ESPHome, and more practically (b) that wouldn't let me turn it on and off just by touching the lamp body, which is what sent me down this rabbit-hole in the first place.
Anyway, I know this sort of thing can be done, but I'm not completely sure how. I know I could figure it out myself eventually, but I figured it couldn't hurt to ask for advice in case somebody happens to be able to rattle off part numbers for the whole BOM off the top of their head, or knows exactly the right ESPHome howto to point me towards, or something like that. Any advice is welcome!
(In case it's relevant: my level of experience is that I programmed an Arduino to run neopixels (WS2812 RGB addressable LEDs) once, I've flashed ESPHome on some Sonoff S31 smart switches, and I'm a software engineer by trade but have never worked on anything IoT related professionally.)
A single ESP32 dev board and a 120VAC-> 5V power supply module should be all the hardware necessary to read a touch sensor, talk to Home Assistant, and control RGBW LEDs. I figured the tricky bits would be (a) the software to get the three different functions to all run at the same time (I'm hoping that ESPHome might reduce that to a "configuration" problem instead of a "programming" one), and (b) finding a nice, bright, RGBW LED in a suitable form factor (one that isn't a smart light bulb, but instead replaces the lamp socket itself).
I'm not really interested in solutions that require multiple microcontrollers or that aren't actually better than using a smart switch or smart bulb.
Well yeah. I guess if you want to DIY a solution there's a lot more you can do. My issue is building a polished finished product rather than exposed wires and a switch, since I have the wife approval factor to consider now. So it's easiest for me to buy a smart outlet and a button or switch vs wiring up my own solution and trying to 3d print a case these days.
The idea is that, with the exception of the LED assembly and antenna, it'd all fit inside the hollow lamp body. There's plenty of space: I could even fit a Raspberry Pi Zero (or maybe even Model A) in there if I wanted.
You could even just take the switch apart and rewire it to an IO pin, and then actually control the bulb socket with a relay. In that case you could have it truly integrated and nobody would notice a difference.
That would work if I wanted to settle for just on/off control of the light bulb and give up on the idea of controlling the hue and color temperature of an RGBW LED.
Basically the issue I'm running into is this: