I'm a total beginner with hobbyist electronics and I'm trying to design a way to switch off/on a mains-powered baseboard heater with a microcontroller. The microcontroller would have access to mains power and would be battery-powered. The pin outputs are 3.3V on the microcontroller. One particular issue is that I want to run the microcontroller on batteries, so I think I want a latching relay like this one.
However, that relay seems to have a coil current of about 200mA, which I think is way too high to be drawn from the microcontroller. And at that point I'm in way over my head in terms of how to switch it on and off.
I checked out an answer here, but the circuits provided there seem reasonably complex and I was just hoping for something I could wrap my mind around without worrying about lighting the house on fire.
Am I missing something more straightforward, or are latching relays the way to go in this case? Single coil? Double coil?