I can’t seem to understand the engineering behind non-push buttons. Take for example my coffee maker. I tap my finger on the top of it and it turns on, but theres no physical button, just the power symbol. I figured this would be more fun than asking google.
In: 5
It’s a very low voltage current, like a signal current that passes through the button. If that signal stays the same, then the machine knows the button wasn’t touched. When your finger makes contact, it disrupts the signal (you are conductive) and the machine takes that disruption as a button push and does something. There is other circuit board logic to help determine a true button push over some sort of fault, like using the capacitance of a human finger to set a realistic range of disruption or predict how the signal will be changed accurately, and rejecting signals that don’t fit the expectation.
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