fitri WROTE:Hi,
this is my understanding,
4N25M use for arduino input = use to detect zero crossing of AC
MOC3012 replace with MOC3041, =this use to trigger bt137
all resistor need to calculate back.
I forgot to mention that the circuit is for someone with good electronics experience. If you connect 220V AC directly to both opto couplers, there is always some dangers that you might get shocked by the AC and worse if you use breadboards.
If you dont understand what I have posted and need to double confirm for what I've said, this project is certainly not for you.
If something bad happens to you, I would be feeling guilty and might get me into trouble. Why not do some other safer projects and when you gain enough experience, you can always come back to do this project ?
I am not going to response to any further questions concerning this project unless others are willing to help. cheers!!
Allen