![]() In this example, every time you press the button, the LED will switch on or off – depending on its current state. This filters out the noise of a bouncy button. Basically, what we do is record a state change and then ignore further input for a couple milliseconds until we are satisfied the bouncing has stopped. ![]() This lesson will explore one way to “debounce” a button using code. This is why the button count from the last lesson may have been sporadic at times – it was registering unintended state changes due to bouncing. ![]() It is not a manufacturing defect of the button – bouncing is implicit in most physical switches.īouncing happens in a matter of milliseconds – but your microcontroller is moving so fast that it will detect a transition between two states every time the button bounces. This making and breaking contact is called bouncing. In fact, it may make contact on one side – then both – and then the other side – until it finally settles down. When you press a button down, it may not immediately make a complete connection. ![]() There is a thing called bounciness – very technical I know – and it relates to the physical properties of buttons (your are going to learn how to debounce here!). ![]() You may have noticed that button counts aren’t exact – sometimes if you press the button once, it registers two or even three presses. How to go about Debouncing a Button with Arduino ![]()
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