ESP12 4 relay board
So many boards of this kind already exist but i wanted to make my own. One important decision is how to supply ESP12 with a power and the most elegant way is quite small and tiny PCB mountable Hi-Link AC-DC, but it gives only 0.6A so it’s right on the edge for 4 relays and ESP12. There are many more converters of this kind but not this small and often not sealed as this one is.
Another doubt i had was should i use optocouplers or not. At the end i realized, it doesn’t bring me anything that important in my case. After all, this is only a board for my home/garden use.
So, here is the sketch. I hope, soon i’ll publish photos how it actually looks like once i solder PCBs.