Here is a great collection of touch switch circuits. A touch switch is an electronic device that enables us to control a circuit by simply touching a sensor. Simple touch switch circuit with 4011 – ...
Featuring DC to 5-MHz bandwidth, Allegro MicroSystems' galvanically isolated, high-accuracy magnetic current-sensor IC with zero current reference (ACS37030), and overcurrent fault with internal pull ...
All will work with a 5V MCU on the cool side. A heath warning: Do not mess with the mains if you don’t know what you are doing. In modules, any safety performance that these devices have is often ...