For example, take a look at this Phillips AC4014 air purifier that [Anton] connected to Home Assistant by way of an ESP32 ... way out and wired a couple of relays across the power and fan speed ...

This is demonstrated once again, this time on the ESP32 by [aquaticus] with a library that generates PAL/SECAM and NTSC composite signals. As a finishing touch on the hardware side, [aqaticus ...