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I will try to help you use the relay in order to avoid any accidents. According to the relay's picture found in https://www.seeedstudio.com/Grove---Relay-p-769.html, it has a 3VDC coil and its contacts can support up to 250VAC/10A or 30VDC/10A.
So, what you read might have been recommendable when using DC but if you are using AC (as I believe you are doing), you should be safe connecting 220VAC.
The relay also mentions that if you are working on 250VAC, it is not recommendable to surpass 7A, nevertheless if you are just using a light bulb, the current shouldn't even get near that number. Anyhow, you should keep this in mind to avoid any eventuality.
Regarding the third point you mentioned above, what would happen would be that you would interrupt the circuit in two points. This means that the light would only be on when the light switch is closed and the relay in active.
About the fourth point you posted, I don't understand what you mean, could you please specify?
If you connect the relay correctly to both the board and the light, you shouldn't worry about burning the board as both circuits would never get in contact with each other. However, you must always be very cautious when working with power circuits.
Let me know how it goes.
Thanks Peter. I'll give it a shot in the next few days and will even make a video of it just for fun (so if it will be memorable if there is a short )
As to my fourth point I was merely saying that all the examples on the web (often found at instructable.com) stopped at the point where a real device (say a light bulb) was hooked up to the system.
I understand, I hope the information I posted above helped to clear your doubts. I look forward to hearing how your project goes. In case you have any other doubts, please let us know and we'll try to help you in any way we can.
I'm really glad to hear that, thank you for sharing your project with the community.
If you ever need help, please don't hesitate to come back to the community.