I'm new to electronics and have recently fallen in love with it, after buying a few NodeMCUs to play around with. I currently have a load of them around my house monitoring things like temperature and humidity, but would like to further extend their use to garage door controllers and maybe even control mains voltage, which is what my question below relates to.
I have two questions both of which relating to this relay module:
- I understand that the NodeMCU voltage out is 3.3V, however, the relay advertises itself as 3V. Does this small difference have any effect? (i.e. will it still work with a NodeMCU?)
- Whilst I am new to electronics, I do fully understand the risks related to mains power and will take every precaution when dealing with it, including having one of my friends who is a qualified electrical engineer watching over me. The question is: Can the relay module specified above handle European outlet power? (I.e. could this be plugged directly into the side of the relay which is being controlled and have the NodeMCU control it on/off or is the voltage/current etc. too high to work with the relay module linked; either causing a hazard or frying the relay module/NodeMCU?)
I would really appreciate any guidance people can give me, as I am just in the research phase of a possible new project and would like to have a better overall idea of what is/isn't possible specifically with these relay modules. I have been unable to find concrete information on the Amazon page and have instead been told "One Channel 3V Relay interface board, be able to control various appliances, and equipments with large current" and "Optical coupling isolation, input and output power optional independent control ( DC 3V )".
Thank you in advance for any help.