Modulo 4 reles no se como conectarlo

[PeteKnight]

Garage Door: Transmit a hex code on the TX pin of ESP-01

I’ve seen quite a few topics about modules (save the word ‘Widget’ for when you’re talking about Blynk app widgets, or it gets confusing) that I think are virtually identical to yours. A quick search came up with this: And this: At which point I gave up searching… Pete.

Pete.