Hi. The question has just arisen to me whether I can just save myself all the redstone stuff and use a command block to open an iron door. I know that it works but what was the command again. (I'm playing in 1.16) Thanks in advance.
Go to the website: https://mcstacker.net/ and there you can generate commands
To do this, you have to modify the block data. I'm not so sure how to do that right now either. Certainly with setblock and then [open = true], but that is probably also possible with data.
/ setblock ~ ~ ~ iron_door [open = true]
In order to turn or mirror the door, you have to add something else