This is what a bouncing signal would look like: The signal starts low at 0 volts then goes high to 5 volts and stays there. If we connected the push button’s output to an oscilloscope, this is what a clean non-bouncing signal would look like: The bounces usually only last for a few milliseconds, but the Arduino runs so fast that each bounce can be counted as a button press. This causes the button signal to bounce up and down before settling on a resting state. Bumps or dirt on the metal contacts can also prevent a good contact right away. The button might hit one side of the contacts first, then the other side several times before making a reliable connection. But when the button is pressed, the metal contacts inside the button don’t make an instant electrical connection. In order for a microcontroller to detect when a switch is open or closed, it has to constantly listen to or poll the switch to detect when the signal changes. It includes all of the parts, wiring diagrams, code, and step-by-step instructions for 58 different robotics and internet of things projects that are super fun to build! What is a Bouncing Switch? The 3-in-1 Smart Car and IOT Learning Kit from SunFounder has everything you need to learn how to master the Arduino.
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