Switch Bounce Tutorials

Switch Bounce

Microcontrolers may not in Human thinking frequency .Human thinking frequency is lies in some of low Hz .  Microcontroler works variety range of frequency ie ,12Mhz,20 Mhz etc .  In a push Button  micro controller interfacing, Human and Micro controller are feels that whether the push is pressed or not  in different way as follows in the graph .

Some small duration pulse due to denounce generated as multiple touch error
Hardware solution

It can be made by a resistor and a capacitor in the following manner or any other for comfortable

When ever the switch is pressed the capacitor will charge  rapidly ,practically the first charge wil be across  the  ,capacitor ,

So we can avoid the denouncing effect .

The capacitor and the resistor will be select in accordance with time constant . as follows

For more information go here

Will be update