I recently purchased this atomizer module from AliExpress. It works as one might expect when I plug it into a power source, and place the piezo disc on a film of liquid.
However, it comes with its own power switch that needs to be turned on each time because (I guess) it's a normally open switch. Rather than design my own circuit (and I have serious questions about my ability to do that!), it seems it should be simpler to short the contacts for the switch. However, I am unsure whether it matters which of the contact points need to be bridged - there seem to be 4 soldered points. The attached image shows the front and back of the module.
Your guidance is gratefully appreciated.