Arduino Button Debounce Tutorial

Arduino Button Debounce Tutorial

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One of the major problems encountered when using push buttons and switches in digital electronics project is the problem of bouncing. When we press a button once it may register twice and when we press it four times, in a row, it may register just twice. This occurrence is due to a property of switches known as bounciness which is as a result of the physical property of the switches.

Contact bounce (also called chatter) is a common problem with mechanical switches and relays. Switch and relay contacts are usually made of springy metals so when a switch is pressed, its essentially two metal parts coming together and even though the connection may seem already made to the user, it may not happen immediately, as a matter of fact, it may make contact on one side – then both – and then the other side –, technically bouncing between in-contact and not-in-contact until it finally settles down. This result in a rapidly pulsed electric current instead of a clean transition from zero to full current as shown in the graph below.

Arduino Button Debounce Tutorial – [Link]

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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