switch bounce

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switch bounce
what is switch bounce

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Here is a definition:

Switch Bounce happens when you close a mechanical switch. When you close a switch it tends to literally bounce upon the metal contact which connects the circuit.

It’s almost like dropping a basketball. The basketball will hit then ground (analogous to a closed switch) then bounce back up (analogous to a open switch) then bounce back down, then up, then down, etc… until it permanently stays on the ground (permanently closed).

Usually switches take a few microseconds to a few milliseconds to completely close. What this means in terms of digital logic is that as the switch physically bounces your logic can switch back and forth low-to-high-to-low-etc… until your switch settles down.

If you google ‘Switch Bounce’  you will get all the information you will need.

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