Good day guys!
I am working on a smart humidifier and I bought this mist maker with a tact switch. I am wondering if I can bypass/disable this tact switch without using any mosfet or relay on it? Thank you
You could switch the power on/off with a MOSFET or relay circuit controlled by the Arduino.
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Maybe yes maybe no! Just what does this switch do. Is it push on push off? It looks mainly like a SMPS module. Can you post a schematic of this board. Is this a homework question?
Come on!
Get with the program! 
Let's have the Web link to the devices you are using.
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