I am about to start a project and I am having a problem figuring out a good way to power my project. I am thinking about using an Arduino Uno, 3 probes(temp, humidity), and a 4 channel 120v relay board (elegoo). I also might use a OLED 12854 module or just a standard 2 line lcd display.
Now the question I have is what would be the best way to power a setup like this? I have read that the board itself would not be able to power the relay board by itself most likely so I was thinking that I could let the Arduino power the probes and oled/lcd module, and then use a breadboard power supply for the 5v to the relay board?
I was thinking about just using a 12v ac/dc switching power supply to power them but a few posts on here say that that it is not a good route to go so I was wondering if a barrel splitter from a AC adapter be enough to handle both the Arduino and the second power supply?
Notes that may effect my options. Everything will be in a dustproof/waterproof enclosure. Since there will be no "fresh" air going into the enclosure I am not sure how warm the components will get.