I need to switch power(110v/3amp) on/off based on information from sensors. I'd switch power maybe once in a few hours.
i came across this 3v relay (https://www.amazon.com/Driver-Module-optocouple-Arduino-Raspberry/dp/B01F1355D2). which seemed to fit the requirements.
But i'm still confused if the above can be ran from the arduino pins or i'd have to build the CB like stated here - Controllable Power Outlet - SparkFun Electronics ?
What is the proper (safe!) Approach?