I have a few light bulbs with mode memory, that can switch to different scenes (bright/medium/dim) using the wall switch. I like this, because there’s no fiddling with remotes or wireless setups, it just always works.
I want to install red LED lights in my room and switch to those at night. However, there are no light bulbs with mode memory that can switch between white and red – those only exist as “smart” bulbs and usually with RGB. I don’t want “smart”.
My large light fixture has space for many light bulbs. I’m thinking about making my own E27 splitter/socket with mode memory, so I can install a regular white bulb and a regular red bulb and switch between them from the wall switch.
Idea: use an ATtiny85 microcontroller, a two channel SSR board for switching the E27 sockets, and a little 5V power supply. Maybe use a capacitor to measure on startup how long ago the thing was switch off, and decide whether to alternate output or stick with mode memory based off that.
Could even add an RTC and switch automatically at set times. But at that point, I might as well use an ESP32. And then use 2ch triac dimmer module so I can automatically dim, too.
To be continued.