This is how I did it from my AC doorbell using optocoupler. AC doorbell to DC to 433mhz device My Doorbell used 18V and I didn’t fancy running a esp off it so I modified a 433 door sensor. It has worked well.
This is how I did it from my AC doorbell using optocoupler. AC doorbell to DC to 433mhz device My Doorbell used 18V and I didn’t fancy running a esp off it so I modified a 433 door sensor. It has worked well.