The result is a reliable, tactile button that will work whenever pressed, but that leaves us with downsides. They now serve as a way to secure the device, as well as for paying things with a fingerprint. ![]() ![]() Nowadays, Apple and Samsung have engineered fingerprint scanners into their home buttons to give them even more function and versatility. This function is not available for capacitive or software buttons, as they require power to be used in the first place a definite positive for momentary contacts. The iPhone and Samsung Galaxy line, for example, both allow their home buttons to wake the device, while leaving the sleep function exclusively for the sleep/wake button. In addition, hardware buttons can also function as a wake button. The most common hardware button used in smartphones are push button switches, and more specifically, use momentary contacts―they only work for as long as they're pressed. Typically, hardware buttons require more technology under the hood such as the contact points and the physical home button itself. ![]() People naturally push buttons out of curiosity, so it makes sense for a physical button to exist in order to teach the user what the button does.
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